CN113944058B - Research method based on high-strength fatigue-resistant duplex stainless steel wire rope and steel wire rope - Google Patents
Research method based on high-strength fatigue-resistant duplex stainless steel wire rope and steel wire rope Download PDFInfo
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- 229910001039 duplex stainless steel Inorganic materials 0.000 title claims abstract description 135
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 54
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- D—TEXTILES; PAPER
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- D07B—ROPES OR CABLES IN GENERAL
- D07B1/00—Constructional features of ropes or cables
- D07B1/06—Ropes or cables built-up from metal wires, e.g. of section wires around a hemp core
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- D—TEXTILES; PAPER
- D07—ROPES; CABLES OTHER THAN ELECTRIC
- D07B—ROPES OR CABLES IN GENERAL
- D07B2201/00—Ropes or cables
- D07B2201/20—Rope or cable components
- D07B2201/2001—Wires or filaments
- D07B2201/2009—Wires or filaments characterised by the materials used
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- D—TEXTILES; PAPER
- D07—ROPES; CABLES OTHER THAN ELECTRIC
- D07B—ROPES OR CABLES IN GENERAL
- D07B2205/00—Rope or cable materials
- D07B2205/30—Inorganic materials
- D07B2205/3021—Metals
- D07B2205/3085—Alloys, i.e. non ferrous
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- D—TEXTILES; PAPER
- D07—ROPES; CABLES OTHER THAN ELECTRIC
- D07B—ROPES OR CABLES IN GENERAL
- D07B2401/00—Aspects related to the problem to be solved or advantage
- D07B2401/20—Aspects related to the problem to be solved or advantage related to ropes or cables
- D07B2401/202—Environmental resistance
- D07B2401/2025—Environmental resistance avoiding corrosion
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- D—TEXTILES; PAPER
- D07—ROPES; CABLES OTHER THAN ELECTRIC
- D07B—ROPES OR CABLES IN GENERAL
- D07B2401/00—Aspects related to the problem to be solved or advantage
- D07B2401/20—Aspects related to the problem to be solved or advantage related to ropes or cables
- D07B2401/2055—Improving load capacity
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Abstract
The invention belongs to the technical field of high-speed railway steel wire rope application, and particularly discloses a research method based on a high-strength fatigue-resistant duplex stainless steel wire rope and the steel wire rope. And 2, determining the optimal solid solution process parameters of the samples subjected to solid solution treatment under different parameters. And 3, performing stress corrosion test on the 23cr7ni2mo0.6cu duplex stainless steel subjected to the optimal solution treatment. The research method based on the high-strength fatigue-resistant duplex stainless steel wire rope and the steel wire rope have the beneficial effects that: the double-phase stainless steel for the tension compensation rope is subjected to component optimization design by a software simulation method with high strength, low harmful phase precipitation sensitivity and high corrosion resistance as requirements, and the steel wire proportion of the steel wire rope is 23% of Cr, 7% of Ni, 2% of Mo and 0.6% of Cu, and the steel wire rope adopts a 17X 25Fi structure.
Description
Technical Field
The invention belongs to the technical field of high-speed railway steel wire rope application, and particularly relates to a research method based on a high-strength fatigue-resistant duplex stainless steel wire rope and the steel wire rope.
Background
With the rapid development of high-speed railways, the traditional austenitic stainless steel tension compensation rope has difficulty in meeting the performance requirements set forth by the new electrified railway construction standard. Compared with austenitic stainless steel, the duplex stainless steel has the advantages of high strength, stress corrosion resistance, good fatigue resistance and the like, and is a good material for manufacturing a new generation of high-performance tension compensation rope. The existing grade duplex stainless steel also has the problems of large deformation resistance, uncooled two-phase deformation, precipitation of harmful phases and the like in the aspect of wire processing.
Therefore, the research designs and prepares a novel duplex stainless steel tension compensation rope aiming at the service environment of the tension compensation rope and the processing characteristics of wires, systematically researches the thermal deformation behavior, the solution treatment process and the stress corrosion behavior of the duplex stainless steel for the tension compensation rope, reasonably designs the strand structure of the novel tension compensation rope, and provides theoretical references for production and application in the manufacturing field of the duplex stainless steel tension compensation rope. The specific study contents are as follows: (1) The method comprises the steps of optimally designing components of duplex stainless steel for a tension compensation rope, determining an alloy system according to an alloying mechanism of the duplex stainless steel, carrying out orthogonal design on the content of each element in the system, carrying out performance simulation on each component in an orthogonal table by using JMaPro software, and obtaining optimal alloy components through comparison; (2) The thermal deformation behavior of the duplex stainless steel for the tension compensation rope is researched, a thermal compression simulation experiment is carried out on the designed and prepared duplex stainless steel, a thermal deformation constitutive model of the steel is built, a thermal processing diagram is drawn, the optimal thermal deformation parameters are determined, and the deformation coordination and dynamic softening behavior of two phases in the thermal deformation process are researched deeply; (3) Study on a double-phase stainless steel solid solution process for a tension compensation rope, summarizing the influence rule of main solid solution parameters on each performance of the double-phase stainless steel through solid solution experiment of different parameters, and determining the optimal solid solution process of the double-phase stainless steel for the tension compensation rope; (4) And (3) researching the influence rule and the intermediate annealing process of cold deformation on the performance of the duplex stainless steel. The method comprises the steps of (1) carrying out a slow strain rate tensile test on cold-rolled deformed duplex stainless steel, summarizing the influence of cold deformation on the mechanical and stress corrosion resistance properties of the duplex stainless steel, determining an optimal intermediate annealing process of the duplex stainless steel for a tension compensation rope through annealing experiments with different parameters, (5) determining a strand structure of the tension compensation rope by comparing performance characteristics of steel wire ropes in different twisting modes and service characteristics of the tension compensation rope, and determining wire diameter proportions by utilizing a cross section geometric relationship.
Accordingly, in view of the above problems, the present invention provides a method of research based on a high-strength fatigue-resistant duplex stainless steel wire rope and a steel wire rope.
Disclosure of Invention
The invention aims to: the invention aims to provide a research method based on a high-strength fatigue-resistant duplex stainless steel wire rope and the steel wire rope, wherein the composition of the duplex stainless steel for the tension compensation rope is optimally designed by a software simulation method, so that the optimal composition ratio of Cr to 23 wt%, ni to 7 wt%, mo to 2 wt%, cu to 0.6 wt%, the high-strength fatigue-resistant duplex stainless steel wire rope adopts a 17X 25Fi structure, the twisting direction is selected to be twisted alternately in the left direction or the right direction, and the diameter ratio of a center strand to a center side strand is 1.6:1:2.
The technical scheme is as follows: the invention provides a research method based on a high-strength fatigue-resistant duplex stainless steel wire rope, which comprises the following steps of 1, determining the steel wire material components of the high-strength fatigue-resistant duplex stainless steel wire rope through a JMATPro software simulation test, smelting and forging, and testing the influence of a hot processing process on the structure and performance of the high-temperature compression test of the 237 Cr7Ni2Mo0.6Cu duplex stainless steel by using a Gleeble-3500 type thermal simulation tester. And 2, carrying out tissue observation, hardness test, tensile test, phase analysis and electrochemical test on the samples subjected to the solution treatment under different parameters, testing the influence rule of the solution parameter change on each performance of the duplex stainless steel, comprehensively settling each performance, and determining the optimal solution process parameters. Step 3, performing stress corrosion test on the optimal solution treated 23cr7ni2mo0.6cu duplex stainless steel, wherein 5wt.% FeCl is selected 3 The solution is used as a corrosive medium, the stretching rate is 0.00006mm/s, and the equivalent strain rate is 2 multiplied by 10 6 s -1 Stress corrosion testing was performed.
According to the technical scheme, firstly, the composition analysis of the duplex stainless steel for the compensating rope is carried out, the effect of each alloy element in the duplex stainless steel is combined, a duplex stainless steel composition system is determined, orthogonal simulation experiments are carried out on the composition of the steel by utilizing JMATPro software, the optimal composition proportion of the duplex stainless steel for the compensating rope is determined, secondly, the thermal deformation behavior analysis of the duplex stainless steel of the Cr23Ni7Mo2Cu0.6 is carried out, the thermal processing parameter safety zone of the duplex stainless steel of the Cr23Ni7Mo2Cu0.6 is wider, the destabilization zone of the duplex stainless steel of the Cr23Ni7Mo2Cu0.6 mainly occurs at a low-temperature low-strain rate when the strain is smaller, the destabilization zone is transferred to a high-temperature high-strain zone when the strain is larger than 0.6, the optimal thermal processing parameter window is determined to be 1050-1150 ℃/0.01s < -1 > -1 s < -1 >, finally, the influence of solid solution treatment on the structure and performance of the duplex stainless steel is analyzed, the material is expected to have higher plasticity, lower deformation resistance and good structure uniformity in the drawing deformation process of the steel wire, and the tensile stress of the steel wire is favorable for lowering the temperature of the Cr 23Ni7Mo2Cu0.7Mo0.
According to the technical scheme, the research method based on the high-strength fatigue-resistant duplex stainless steel wire rope further comprises the steps of analyzing the influence of cold deformation on the structure and the performance of the duplex stainless steel, wherein the Cr23Ni7Mo2Cu0.6 duplex stainless steel is 5wt.% FeCl 3 Under the combined action of the solution and the stress, the austenite phase is preferentially corroded and dissolved, the ferrite phase is protected, the austenite strip-shaped form can lead the austenite to have a guiding effect on corrosion invasion, the formation and the expansion of transverse cracks are effectively prevented, the longer the strip-shaped austenite is, the more obvious the guiding effect on corrosion is, and the increased deformation is beneficial to reducing the stress corrosion sensitivity of the Cr23Ni7Mo2Cu0.6 duplex stainless steel.
In another aspect, the invention provides a high-strength fatigue-resistant duplex stainless steel wire rope, which comprises the following chemical components in percentage by mass: fe and unavoidable impurities.
According to the technical scheme, the high-strength fatigue-resistant duplex stainless steel wire rope adopts a 17X 25Fi structure, the twisting direction is left or right alternately twisted, the diameter ratio of a central strand to a central side strand to the side strand is 1.6:1:2, and the diameter ratio of thick wires to filling wires in a single strand is 1:0.35; when the diameter of the whole rope is set to be 10mm, the diameter of the thick wire of the central strand is 0.45mm, the diameter of the filling wire is 0.16mm, the diameter of the thick wire of the central side strand is 0.28mm, the diameter of the filling wire is 0.1mm, the diameter of the thick wire of the side strand is 0.55mm, and the diameter of the filling wire is 0.2mm.
Compared with the prior art, the research method based on the high-strength fatigue-resistant duplex stainless steel wire rope has the beneficial effects that: (1) The double-phase stainless steel for the tension compensation rope is subjected to component optimization design by a software simulation method with high strength, low harmful phase precipitation sensitivity and high corrosion resistance as requirements, and the result shows that the optimal component proportion is 23% of Cr, 7% of Ni, 2% of Mo and 0.6% of Cu; (2) The thermal processing diagram under different strain amounts shows that the thermal processing parameter safety zone of the Cr23Ni7Mo2Cu0.6 duplex stainless steel is wider, the destabilization zone of the Cr23Ni7Mo2Cu0.6 duplex stainless steel mainly occurs at low temperature and low strain rate when the strain is smaller, the destabilization zone is transferred to the high-strain zone when the strain is larger than 0.6, and the optimal thermal processing parameter window is 1050-1150 ℃/0.01s -1 ～1s -1 The method comprises the steps of carrying out a first treatment on the surface of the (3) The cr23Ni7Mo2Cu0.6 duplex stainless steel has sigma phase precipitation when the heat is preserved at 960 ℃ and below, higher solid solution temperature is beneficial to the structural uniformity of the steel, when the heat preservation time is set to 2 hours, the hardness and the strength are firstly reduced and then increased along with the increase of the solid solution temperature, the minimum values of 94.4HRB and 547MPa are respectively reached at 1020 ℃ and 1050 ℃, the elongation is firstly reduced, the maximum value of 41.5% is reached at 990 ℃, the solid solution temperature is 960 ℃, the self-corrosion potential of the cr23Ni7Mo2Cu0.6 duplex stainless steel in a 3.5 wt% NaCl solution is increased to-0.619V, the pitting potential is increased to 0.222V, the best corrosion resistance is achieved, the material is hopeful to have higher plasticity, lower deformation resistance and good structural uniformity in consideration of the drawing deformation process of steel wires, the lower hardness is favorable for reducing the die, the solid solution treatment temperature of the cr23Ni7Mo2Cu0.6 duplex stainless steel for tension compensation rope is preferably selected to be at 1020 ℃, the extension time is 960 ℃, the self-corrosion potential of the cr23Ni7Mo 2V 0.6 duplex stainless steel in the 3.5 wt% in the NaCl solution is increased to-0.619V, the corrosion resistance is obviously reduced in the deformation resistance of the cold deformation process is obviously reduced, the cold deformation resistance of the duplex steel is greatly reduced in the deformation resistance of the duplex steel is not affected by the heat 1, the cold corrosion resistance is greatly reduced in the deformation resistance than the duplex steel is better than the deformation resistance 1The heat preservation time of the solution treatment is proper for 2 hours, the cooling mode of the Cr23Ni7Mo2Cu0.6 duplex stainless steel in the solution treatment engineering is preferably water cooling or oil cooling, and sigma phases are separated out from the steel to different degrees when the air cooling and the furnace cooling are adopted, so that the plasticity and the corrosion resistance of the steel are reduced; (4) When the cold deformed Cr23Ni7Mo2Cu0.6 duplex stainless steel is subjected to intermediate annealing at 1020 ℃, ferrite and austenite are respectively recovered and recrystallized, so that the hardness is rapidly reduced, but the softening speed of a sample under different deformation amounts is different, the time required for softening until the hardness is stable under 45% deformation amount and 60% deformation amount is 2-4min, and the time is prolonged to 8-10min under 15% deformation amount and 30% deformation amount; (5) The Cr23Ni7Mo2Cu0.6 duplex stainless steel is 5wt.% FeCl 3 Under the combined action of the solution and the stress, the austenite phase is preferentially corroded and dissolved, the ferrite phase is protected, the austenite strip-shaped form can lead the austenite to have a guiding effect on corrosion invasion, the formation and the expansion of transverse cracks are effectively prevented, the slender strip-shaped austenite has more obvious guiding effect on corrosion, and therefore, the increased deformation is beneficial to reducing the stress corrosion sensitivity of the Cr23Ni7Mo2Cu0.6 duplex stainless steel; (6) The novel tension compensation rope adopts a 17X 25Fi structure, the twisting direction is selected to be twisted alternately in the left direction or the right direction, the diameter ratio of a central strand to a central side strand is 1.6:1:2, the diameter ratio of a single-strand middle thick wire to a filling wire is 1:0.35, when the diameter of the whole rope is 10mm, the diameter of the central strand thick wire is 0.45mm, the diameter of the filling wire is 0.16mm, the diameter of the central side strand thick wire is 0.28mm, the diameter of the filling wire is 0.1mm, the diameter of the side strand thick wire is 0.55mm, and the diameter of the filling wire is 0.2mm.
Drawings
FIG. 1 is a diagram of the Jmatpro simulation results (a) Cr23Ni7Mo2Cu0.6 duplex stainless steel thermal equilibrium phase diagram, (b) Cr23Ni7Mo2Cu0.6 simulation phase diagram;
FIG. 2 is a graph of thermal processing at different deformation levels;
FIG. 3 shows the microstructure after water cooling at (a) 900 ℃, (b) 930 ℃, (c) 960 ℃, (d) 990 ℃, (e) 1020 ℃, (f) 1050 ℃, (g) 1080 ℃, (h) 1110 ℃ after 2h incubation at different temperatures;
FIG. 4 is a graph showing the relationship between (a) the ferrite ratio after solid solution at different temperatures, (b) the relationship between hardness and solid solution temperature, and (c) the relationship between strength and elongation at 2h for a heat-retaining time and solid solution temperature;
FIG. 5 is a polarization curve of Cr23Ni7Mo2Cu0.6 duplex stainless steel with different solution temperatures in 3.5wt.% NaCl solution;
FIG. 6 shows the microstructure (a) 0.5h (b) after water cooling after incubation at 1020℃for various periods of time
1h、(c)1.5h、(d)2h；
FIG. 7 is a rule of influence of solid solution time on mechanical properties of Cr23Ni7Mo2Cu0.6 duplex stainless steel, (a) hardness, (b) strength and elongation;
FIG. 8 is a plot of polarization of samples after water cooling after incubation at 1020℃for various times;
FIG. 9 shows the microstructure of Cr23Ni7Mo2Cu0.6 duplex stainless steel after solid solution in different cooling modes, including (a) water cooling, (b) oil cooling, (c) air cooling, (d) furnace cooling,
FIG. 10 is the effect of cooling on mechanical properties of Cr23Ni7Mo2Cu0.6 duplex stainless steel, (a) hardness, (b) strength and elongation;
FIG. 11 is a polarization curve of Cr23Ni7Mo2Cu0.6 duplex stainless steel with different cooling modes;
FIG. 12 is a graph of (a) 15%, (b) 30%, (c) 45%, (d) 60% of a duplex stainless steel microstructure of Cr23Ni7Mo2Cu0.6 at different deformation;
fig. 13 (a) hardness and its increment for different amounts of deformation, (b) strength and elongation for different amounts of deformation;
FIG. 14 is an effect of annealing time on hardness of as-rolled Cr23Ni7Mo2Cu0.6 duplex stainless steel;
FIG. 15 shows microstructures (a) 30%,1min, (b) 30%,8min, (c) 60%,1min, (d) 60%,8min of Cr23Ni7Mo2Cu0.6 duplex stainless steel with different deformation amounts after annealing for different times;
FIG. 16 is a graph of the slow strain rate stretch curves (a) 0%, (b) 15%, (c) 30%, (d) 45%, (e) 60% for Cr23Ni7Mo2Cu0.6 duplex stainless steel with different deformation;
elongation and I of FIG. 17 (a) scc-A Trend of variation with deformation, (b) reduction of area and I scc-Z Trend of variation with deformation amount;
FIG. 18 is a surface and cross-sectional profile of a etch pit, (a) (b) surface profile, (c) (d) cross-sectional profile;
fig. 19 (a) a schematic cross-sectional structure of a novel tension compensating rope, (b) a schematic cross-sectional structure of a siru type;
fig. 20 is a schematic cross-sectional view of a 1 x 25Fi strand.
Detailed Description
The invention will be further elucidated with reference to the drawings and to specific embodiments.
The research method based on the high-strength fatigue-resistant duplex stainless steel wire rope comprises the following steps of 1, determining the steel wire material components of the high-strength fatigue-resistant duplex stainless steel wire rope through a JMaPro software simulation test, smelting and forging, and testing the influence of a hot working process on the structure and the performance of the 23Cr7Ni2Mo0.6Cu duplex stainless steel by using a Gleeble-3500 type thermal simulation tester. And 2, carrying out tissue observation, hardness test, tensile test, phase analysis and electrochemical test on the samples subjected to the solution treatment under different parameters, testing the influence rule of the solution parameter change on each performance of the duplex stainless steel, comprehensively settling each performance, and determining the optimal solution process parameters. Step 3, performing stress corrosion test on the optimal solution treated 23cr7ni2mo0.6cu duplex stainless steel, wherein 5wt.% FeCl is selected 3 The solution is used as a corrosive medium, the stretching rate is 0.00006mm/s, and the equivalent strain rate is 2 multiplied by 10 6 s -1 Stress corrosion testing was performed.
The research method based on the high-strength fatigue-resistant duplex stainless steel wire rope is preferable, firstly, the composition analysis of the duplex stainless steel for the compensating rope is carried out, the composition system of the duplex stainless steel is determined by combining the action of each alloy element in the duplex stainless steel, and the composition of the steel is subjected to orthogonal simulation experiments by using the JMaPro software, so that the optimal composition proportion of the duplex stainless steel for the compensating rope is determined, secondly, the thermal deformation behavior analysis of the duplex stainless steel for the Cr 237 Mo2Cu0.6 duplex stainless steel is carried out, the thermal working parameter safety zone of the Cr 237 Mo2Cu0.6 duplex stainless steel is wider, the destabilization zone of the Cr23Ni7Mo2Cu0.6 duplex stainless steel mainly occurs at low temperature and low strain rate when the strain is smaller, the destabilization zone is transferred to the high-temperature high-strain zone when the strain is larger than 0.6, the optimal thermal working parameter window is determined to be 1050-1150 ℃/0.01s & lt-1 & gts & lt-1 & gt, finally, the influence of the heat treatment on the structure and the performance of the duplex stainless steel is analyzed, the deformation process of the steel wire hopes that the material has higher, the lower deformation uniformity and better than that the tensile strength of the Cr23Ni7Mo2Cu0.6 duplex stainless steel is better, and the tensile resistance of the Cr 230.230 is obtained, and the tensile stress of the Cr-wire is better than the Cu 2, and the tensile stress resistance of the Cr steel is lower, and the wear resistance is lower than the stress and the wear resistance of the Cr2 and the wear resistance.
The research method based on the high-strength fatigue-resistant duplex stainless steel wire rope is preferable and further comprises analyzing the influence of cold deformation on the structure and the performance of the duplex stainless steel, wherein the duplex stainless steel of Cr23Ni7Mo2Cu0.6 is 5wt.% FeCl 3 Under the combined action of the solution and the stress, the austenite phase is preferentially corroded and dissolved, the ferrite phase is protected, the austenite strip-shaped form can lead the austenite to have a guiding effect on corrosion invasion, the formation and the expansion of transverse cracks are effectively prevented, the longer the strip-shaped austenite is, the more obvious the guiding effect on corrosion is, and the increased deformation is beneficial to reducing the stress corrosion sensitivity of the Cr23Ni7Mo2Cu0.6 duplex stainless steel.
The high-strength fatigue-resistant duplex stainless steel wire rope based on the invention comprises the following chemical components in percentage by mass,
23% of Cr, 7% of Ni, 2% of Mo, 0.6% of Cu and the balance of: fe and unavoidable impurities.
The high-strength fatigue-resistant duplex stainless steel wire rope is preferably of a 17X 25Fi structure, the twisting direction is left or right alternately twisted, the diameter ratio of the central strand to the central side strand is 1.6:1:2, and the diameter ratio of the thick wires to the filling wires in the single strand is 1:0.35; when the diameter of the whole rope is set to be 10mm, the diameter of the thick wire of the central strand is 0.45mm, the diameter of the filling wire is 0.16mm, the diameter of the thick wire of the central side strand is 0.28mm, the diameter of the filling wire is 0.1mm, the diameter of the thick wire of the side strand is 0.55mm, and the diameter of the filling wire is 0.2mm.
Examples
(1) The design of the duplex stainless steel components for the compensating rope is that the tension compensating rope is subjected to the effects of daily exposure, pollution and corrosion and variable stress in service for a long time, and the strength, the corrosion resistance and the fatigue resistance are important performance indexes of the rope, and the performances depend on the chemical components of steel to a great extent. In order to ensure good comprehensive performance of the duplex stainless steel for the tension compensation rope, the chapter combines the functions of all alloy elements in the duplex stainless steel, determines a duplex stainless steel component system, and utilizes the JMATPro software to carry out orthogonal simulation experiments on the components of the steel, thereby determining the optimal component proportion of the duplex stainless steel for the compensation rope.
Component design orthogonal table and performance simulation results
Aiming at the characteristic of large processing deformation of the tension compensation rope, the duplex stainless steel for the compensation rope is preferably a Cr-Ni-Mo-Cu alloy system, and the performance simulation orthogonal test results show that the optimal component ratio is Cr:23wt.%, ni:7wt.%, mo:2wt.%, cu:0.6wt.%.
FIG. 1 shows that the suitable solution treatment temperature of the Cr23Ni7Mo2Cu0.6 duplex stainless steel is 1055 ℃, the ratio of austenite to ferrite reaches 1:1, intermetallic phases which can be separated out in the high-temperature cooling process are sigma phase, χ phase and LAVES phase, wherein the sigma phase is separated out more sensitively, and a liquid medium is preferably used as a cooling medium in the processing process.
(2) Thermal deformation behavior study of Cr23Ni7Mo2Cu0.6 duplex stainless steel is shown in fig. 2, (a) epsilon=0.2, (b) epsilon=0.4, (c) epsilon=0.6, (d) epsilon=0.8 thermal processing patterns under different strain amounts show that a thermal processing parameter safety zone of the Cr23Ni7Mo2Cu0.6 duplex stainless steel is wider, a destabilization zone of the Cr23Ni7Mo2Cu0.6 duplex stainless steel mainly occurs at low temperature and low strain rate when strain is smaller, and when the strain amount is larger than 0.6, the destabilization zone is transferred to a high-strain zone, and an optimal thermal processing parameter window is 1050-1150 DEG C
/0.01s-1～1s-1。
(3) The effect of solution treatment on the structure and properties of duplex stainless steel is shown in figures 3, 4 and 5, the electrochemical corrosion parameters of the samples of different solution temperatures in 3.5wt.% NaCl solution are shown in table 3.1,
as the solution temperature increases, the ferrite proportion increases and the austenite proportion decreases in the cr23ni7mo2cu0.6 duplex stainless steel, reaching 1:1 at 930-960 ℃, but the sigma phase precipitates in the steel at this temperature, and the higher solution temperature is beneficial to the uniformity of the structure. In terms of performance, the hardness and the strength tend to decrease first and then increase, respectively reach minimum values at 1020 ℃ and 1050 ℃, the elongation is expressed as increasing first and then decreasing, reaches maximum values at 990 ℃, and has the best corrosion resistance when in solid solution at 960 ℃. The drawing deformation process of the steel wire is expected to have higher plasticity, lower deformation resistance and good tissue uniformity of the material, and lower hardness is favorable for reducing the abrasion of a die, so that the solution treatment temperature of the Cr23Ni7Mo2Cu0.6 duplex stainless steel for the tension compensation rope is preferably selected to be 1020 ℃.
FIG. 6 shows that the microstructure after water cooling, (a) 0.5h, (b) 1h, (c) 1.5h, and (d) 2h have ferrite ratios of 57.25%, 57.08%, 56.46% and 56.6% respectively at the temperature of 1020 ℃ and the phase ratio of 0.5h, 1h, 1.5h and 2h, and the prolongation of the heat preservation time only changes the morphology and distribution of two phases without obvious influence on the phase ratio from 0.5 h. In addition, no sigma phase particles were observed even in the 0.5h incubation sample structure, indicating that the diffusion rate of the element was fast at 1020 ℃, and that the small sigma phase left by forging at 0.5h was completely dissolved.
FIG. 7 is a rule of influence of solid solution time on mechanical properties of Cr23Ni7Mo2Cu0.6 duplex stainless steel, (a) hardness, (b) strength and elongation, FIG. 8 is polarization curve of sample after water cooling at 1020℃for different times, and Table 3.3 parameters of polarization curve of sample at 1020℃for different heat-preserving times
The heat preservation time is prolonged, so that the structural uniformity of the Cr23Ni7Mo2Cu0.6 duplex stainless steel is improved, the hardness and the strength are obviously reduced, the elongation is not obviously changed, and the corrosion resistance performance is best at 1 h. In order to reduce the deformation resistance of the steel in the subsequent cold deformation process and improve the uniformity of the structure and the performance of the finished product, the heat preservation time of the solution treatment of the Cr23Ni7Mo2Cu0.6 duplex stainless steel is proper to be 2 hours.
FIG. 9Cr23Ni7Mo2Cu0.6 duplex stainless steel microstructure after solution in different cooling modes (a) water cooling, (b) oil cooling, (c) air cooling, (d) furnace cooling; FIG. 10 effect of cooling on mechanical properties of Cr23Ni7Mo2Cu0.6 duplex stainless steel, (a) hardness, (b) strength and elongation; FIG. 11 is a polarization curve of Cr23Ni7Mo2Cu0.6 duplex stainless steel with different cooling modes; TABLE 3.2 polarization Curve parameters for samples of different Cooling modes
As can be seen from the above, the structure and mechanical properties of the Cr23Ni7Mo2Cu0.6 duplex stainless steel in the water cooling and oil cooling modes are not obviously different, and sigma phases are precipitated in the steel in different degrees when the air cooling and furnace cooling are adopted, so that the plasticity and corrosion resistance of the steel are reduced, and therefore, the cooling mode of the Cr23Ni7Mo2Cu0.6 duplex stainless steel in the solution treatment engineering is preferably selected to be water cooling or oil cooling.
(4) The influence of cold deformation on the structure and performance of the duplex stainless steel is shown in fig. 12, wherein the cold deformation has the effects of the microstructure of the duplex stainless steel of Cr23Ni7Mo2Cu0.6 under different deformation amounts, (a) 15%, (b) 30%, (c) 45%, (d) 60% the structure is similar to a solid solution state when the deformation amount is 15%, the strip austenite is distributed in a cross direction, the shape is thick and short, the austenite strips begin to be elongated when the deformation amount is 30%, the directions tend to be consistent, the austenite is completely distributed along the rolling direction when the deformation amount is increased to 45%, and the width of the strip austenite is further reduced when the deformation amount is 60%, so that the strip austenite presents a fibrous morphology; FIG. 13 shows (a) hardness and its increment at different deformation amounts, (b) tensile strength and elongation at different deformation amounts at slow strain rate, the tensile strength of the solid solution sample at slow strain rate is 643MPa, elongation is 39.6%, strength continuously increases with increasing deformation amount, elongation decreases, but two indexes have obvious difference in change speed, like hardness, elongation is greatly changed at small deformation amount, elongation decreasing speed is obviously slowed down with increasing deformation amount, elongation of the 60% deformation sample is only reduced by 0.4% compared with 45% deformation, and strength is gradually reduced with increasing deformation amount, but the change is relatively gentle; FIG. 14 is the effect of annealing time on the hardness of as-rolled Cr23Ni7Mo2Cu0.6 duplex stainless steel, and FIG. 15 is the microstructure of Cr23Ni7Mo2Cu0.6 duplex stainless steel with different deformation after annealing for different times, (a) 30%,1min; (b) 30%,8min; (c) 60%,1min; (d) 60% and 8min cold deformed Cr23Ni7Mo2Cu0.6 duplex stainless steel is subjected to intermediate annealing at 1020 ℃, ferrite and austenite are respectively recovered and recrystallized, so that the hardness is rapidly reduced, but the softening speed of a sample under different deformation amounts is different, the time required for softening to be stable in hardness under 45% deformation amount and 60% deformation amount is 2-4min, and the time is prolonged to 8-10min under 15% deformation amount and 30% deformation amount; FIG. 16 is a graph showing the slow strain rate stretch curves (a) 0%, (b) 15%, (c) 30%, (d) 45%, (e) 60% for different deformation amounts of Cr23Ni7Mo2Cu0.6 duplex stainless steel; table 3.5 slow strain rate tensile performance parameters for samples of different deformation,
elongation and I of FIG. 17 (a) scc-A Trend of variation with deformation, (b) reduction of area and I scc-Z Fig. 18 shows the surface and profile of etch pits as a function of deformation, (a) (b) surface profile, and (c) (d) profile.
From the above, it can be seen that the duplex stainless steel of cr23Ni7Mo2Cu0.6 is at 5wt.% FeCl 3 Under the combined action of the solution and the stress, the austenite phase is preferentially corroded and dissolved, the ferrite phase is protected, and the long strip-shaped form of the austenite can lead the austenite phase to have guiding effect on corrosion invasionAnd the formation and the extension of transverse cracks are effectively blocked. The longer the strip austenite, the more pronounced the guiding effect on corrosion, so that an increased deformation is advantageous for reducing the stress corrosion sensitivity of the cr23ni7mo2cu0.6 duplex stainless steel.
The tension compensation rope strand structure design of the invention has higher fatigue resistance performance of an 8-strand steel wire rope structure than a 6-strand steel wire rope structure, has good flexibility, can form good fit with a rope wheel, and has advantages in the aspect of manufacturing the tension compensation rope. According to the contact state between adjacent layers of steel wires in the steel wire rope strand, the steel wire rope can be divided into three basic forms of point contact steel wire ropes, line contact steel wire ropes and surface contact steel wire ropes, the characteristics of the three electric contact steel wire ropes are respectively compared, and the filling type structure with high density coefficient, extrusion resistance and good fatigue resistance is considered to be most suitable for manufacturing the tension compensation rope by combining the service characteristics of the tension compensation rope. The wire rope can be divided into: left side twist wire rope, left side alternately twist wire rope, right side alternately twist wire rope. For the tension compensation rope, one end of the counterweight is in a rotation free state in the service process, so that the non-rotation property of the steel wire rope is required to be high, and the alternative twisting is more suitable.
Considering the selection result of the twisting number, the strand structure and the twisting direction in the foregoing, the structure shown in fig. 19 (a) is considered to be the cross-section structure of the novel tension compensation rope, the whole rope cross section is composed of three layers of a central strand (1), a central side strand (2) and an outer strand (3), and each of the three layers adopts a filling structure of 1×25fi. Firstly, calculating the strand diameter ratio. As shown in fig. 19 (b), the geometric relationship can be used to obtain the following values between the diameters of the strands:
so that
Triangle O 1 CB is a right triangle, and is obtained according to Pythagorean theorem:
O 1 C 2 ＝O 1 B 2 -BC 2
namely there is
According to the geometrical relationship
So there is
In order to obtain the proportional relation of the diameters of the steel wires in each layer in the rope strand, a fixed value can be given to one diameter, and the other diameter value is calculated at the moment, so that the proportional relation of the diameters of the steel wires in each layer can be obtained, and r can be set for simplicity and easy implementation 2 =1, at which point:
when the number of outer strands is 8, phi=22.5°, solving equations (4-7), and (4-8) gives r 1 ≈1.6，r 3 Approximately equal to 2.0, i.e. having r 1 :r 2 :r 3 =1.6:1:2. According to FIG. 7.3 (b)To get r 3 And the radius R of the whole rope is satisfied
As shown in fig. 20, the thick filament radius r is based on the geometric relationship in the 1 x 25Fi strand cross section a Radius r of filling wire b There is a relationship between:
let r be a Equal to 1 is provided with
Solving equation (4-10) by dichotomy to obtain r b =0.354, i.e. r a :r b =1:0.354, so in this design, the center strand (1), center side strand (2) and side strand (3) all satisfy this relationship.
The whole rope radius R is set to be 5mm in the design, the diameters of the steel wires in each strand can be calculated according to the wire diameter proportioning relationship, the diameters of the steel wires in each strand are shown in table 7.2, the diameters of the steel wires in each strand are shown in table 7.1R=10mm,
from the above, the novel tension compensation rope (1) adopts a 17X 25Fi structure, and the twisting direction is left or right alternatively twisted; (2) The ratio of the diameters of the central strand, the central side strand and the side strand is 1.6:1:2, and the ratio of the diameters of the thick filaments and the filling filaments in the single strand is 1:0.35. When the diameter of the whole rope is set to be 10mm, the diameter of the thick wire of the central strand is 0.45mm, the diameter of the filling wire is 0.16mm, the diameter of the thick wire of the central side strand is 0.28mm, the diameter of the filling wire is 0.1mm, the diameter of the thick wire of the side strand is 0.55mm, and the diameter of the filling wire is 0.2mm.
The foregoing is merely a preferred embodiment of the invention, and it should be noted that modifications could be made by those skilled in the art without departing from the principles of the invention, which modifications would also be considered to be within the scope of the invention.
Claims (3)
1. The research method based on the high-strength fatigue-resistant duplex stainless steel wire rope is characterized by comprising the following steps of: comprises the steps of,
step 1, determining the steel wire material components of a high-strength fatigue-resistant duplex stainless steel wire rope through a JMaPro software simulation test, smelting and forging, and using a Gleeble-3500 model thermal simulation tester to test the influence of a hot processing process on the structure and performance of the 23Cr7Ni2Mo0.6Cu duplex stainless steel through a high-temperature compression test;
step 2, carrying out tissue observation, hardness test, tensile test, phase analysis and electrochemical test on the samples subjected to solution treatment under different parameters, testing the influence rule of the solution parameter change on each performance of the duplex stainless steel, comprehensively settling each performance, and determining the optimal solution process parameters;
step 3, performing stress corrosion test on the optimal solution treated 23cr7ni2mo0.6cu duplex stainless steel, wherein 5wt.% FeCl is selected 3 The solution is used as a corrosive medium, the stretching rate is 0.00006mm/s, and the equivalent strain rate is 2 multiplied by 10 6 s -1 Performing stress corrosion test;
further, the method comprises the steps of,
firstly, carrying out component analysis on the duplex stainless steel for the compensation rope, determining a component system of the duplex stainless steel by combining the action of each alloy element in the duplex stainless steel, and carrying out orthogonal simulation experiments on components of the steel by using JMaPro software to determine the optimal component ratio of the duplex stainless steel for the compensation rope;
secondly, analyzing the thermal deformation behavior of the Cr23Ni7Mo2Cu0.6 duplex stainless steel, wherein the thermal processing parameter safety zone of the Cr23Ni7Mo2Cu0.6 duplex stainless steel is wider, the destabilization zone of the Cr23Ni7Mo2Cu0.6 duplex stainless steel mainly occurs at low temperature and low strain rate when the strain is smaller, and the destabilization zone is transferred to a high temperature and high strain zone when the strain is larger than 0.6, and determining that the optimal thermal processing parameter window is 1050 ℃ -1150 ℃/0.01s -1 ~1s -1 ；
Finally, analyzing the influence of solution treatment on the structure and performance of the duplex stainless steel, wherein the drawing deformation process of the steel wire hopes that the material has higher plasticity, lower deformation resistance and good structure uniformity, and lower hardness is beneficial to reducing the abrasion of a die, so that the solution treatment temperature of the Cr23Ni7Mo2Cu0.6 duplex stainless steel for the tension compensation rope is 1020 ℃;
the high-strength fatigue-resistant duplex stainless steel wire rope adopts a 17X 25Fi structure, the twisting direction is selected to be alternately twisted in the left direction or the right direction, the diameter ratio of the central strand to the central side strand is 1.6:2, and the diameter ratio of the thick wire to the filling wire in a single strand is 1:0.35; when the diameter of the whole rope is set to be 10mm, the diameter of the thick wire of the central strand is 0.45mm, the diameter of the filling wire is 0.16mm, the diameter of the thick wire of the central side strand is 0.28mm, the diameter of the filling wire is 0.1mm, the diameter of the thick wire of the side strand is 0.55mm, and the diameter of the filling wire is 0.2mm.
2. The method for researching the high-strength fatigue-resistant duplex stainless steel wire rope according to claim 1, which is characterized in that: also comprises analyzing the effect of cold deformation on the structure and performance of the duplex stainless steel, wherein the duplex stainless steel of Cr23Ni7Mo2Cu0.6 is 5wt.% FeCl 3 Under the combined action of the solution and the stress, the austenite phase is preferentially corroded and dissolved, the ferrite phase is protected, the austenite strip-shaped form can lead the austenite to have a guiding effect on corrosion invasion, the formation and the expansion of transverse cracks are effectively prevented, the longer the strip-shaped austenite is, the more obvious the guiding effect on corrosion is, and the increased deformation is beneficial to reducing the stress corrosion sensitivity of the Cr23Ni7Mo2Cu0.6 duplex stainless steel.
3. The high strength fatigue-resistant duplex stainless steel wire rope according to claim 2, wherein: the high-strength fatigue-resistant duplex stainless steel wire rope consists of the following chemical components in percentage by mass: fe and unavoidable impurities.
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