CN115846682B - Preparation process method of TA15 titanium alloy with high fatigue life based on selective laser melting forming - Google Patents
Preparation process method of TA15 titanium alloy with high fatigue life based on selective laser melting forming Download PDFInfo
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Abstract
The invention relates to the advanced manufacturing field of metal materials, in particular to a preparation process method of TA15 titanium alloy with high fatigue life based on selective laser melting forming, which comprises the following specific steps: s1, processing raw materials; s2, constructing a three-dimensional model; s3, model data processing; s4, preparing a forming cabin; s5, printing and forming; s6, stress relief annealing; s7, hot isostatic pressing; s8, wire cutting; s9, machining; s10, performance detection; the TA15 titanium alloy powder prepared by a plasma rotating electrode method is selected as a raw material, and the powder has high purity, high density, no hollow powder or satellite powder, narrow particle size distribution, good fluidity and no reduction of tensile strength, so that the problems of low fatigue life and high discreteness of TA15 titanium alloy products formed by selective laser melting are solved, the tensile strength can reach 1040MPa, and the cycle time can reach 50 ten thousand times when Kt=2.5 notch sample stress is 430 MPa.
Description
Technical Field
The invention relates to the field of advanced manufacturing of metal materials, in particular to a preparation process method of TA15 titanium alloy with high fatigue life based on selective laser melting forming.
Background
The nominal component of the TA15 titanium alloy is Ti-6.5Al-2Zr-1Mo-1V, the main strengthening mechanism is solid solution strengthening by alpha stable element Al, and neutral elements Zr and beta stable elements Mo and V are added, so that the process performance can be improved, and the TA15 titanium alloy belongs to near alpha titanium alloy with high Al equivalent, so that the TA15 titanium alloy has good heat resistance and weldability of alpha titanium alloy and process plasticity close to that of alpha-beta titanium alloy. TA15 is a medium-strength titanium alloy, has good comprehensive mechanical property and technological property, has higher strength and welding property than TC4 titanium alloy, can work for 3000 hours at 500 ℃, and is applied to various blades and cases of aeroengines; various sheet metal parts, beams, joints, wall plates, welded bearing frames and the like of an airplane are widely applied to the field of aviation.
The traditional processing technology of smelting, cogging, forging and machining for manufacturing TA15 titanium alloy parts with complex shapes faces a series of problems of high hot processing difficulty, long processing period, low material utilization rate and the like. The selective laser melting forming technology is an important branch in the additive manufacturing technology, and because the selective laser melting forming technology adopts a high-power density laser, small-diameter spot laser beams, processed parts are high in size, smooth in surface and free of mold manufacturing, high-performance rapid and near-net forming of parts with complex shapes can be realized, and the selective laser melting forming technology is particularly suitable for single parts and small batch parts which are required to be limited in the field of aviation equipment guarantee and are customized.
At present, the application requirements of TA15 titanium alloy parts formed by selective laser melting in the aviation field are increasing, and particularly functional parts and bearing parts are increasing. The complex parts in the aviation field, especially the bearing structural parts, are rapidly manufactured by adopting the selective laser melting forming technology, and various mechanical property indexes, especially fatigue performance, of the complex parts must reach the technical indexes of the conventional TA15 titanium alloy plates. In recent years, students at home and abroad have studied the static mechanical properties of TA15 titanium alloy formed by selective laser melting, and the fatigue property study is still in a blank stage. The microstructure of the TA15 titanium alloy deposited product formed by selective laser melting contains a large amount of acicular martensite, and the fatigue life of the product is low. Therefore, how to obtain the TA15 titanium alloy part with the high fatigue life is one of key technologies for realizing the application of the TA15 titanium alloy part formed by selective laser melting in the bearing structural member in the aviation field. The microstructure and internal defects of the powder are regulated and controlled by controlling the quality of the powder, adjusting the forming process parameters and the heat treatment process, so that the fatigue life of the powder is prolonged.
For example, china patent application No. 202111207016.6, publication No. 2022, 2 and 1 discloses a heat treatment method for improving fatigue performance of laser selective melting alpha-beta titanium alloy, which comprises the following steps: after the alpha-beta titanium alloy is subjected to stress annealing and hot isostatic pressing, a small amount of equiaxial alpha phase is obtained through high-temperature aging treatment, and needle-shaped martensite alpha' phase in the deposited crystal grains disappears, and the beta matrix and lamellar alpha phase are used instead, so that the fatigue performance of a workpiece is improved. The method aims at fatigue performance of a TC4 titanium alloy selected area laser melting formed part, does not describe a TA15 titanium alloy part, aims at Kt=1, does not describe fatigue performance of a Kt=2.5 notch sample, and focuses on improvement of fatigue strength by a heat treatment process. The invention discloses a preparation process of TA15 titanium alloy manufactured by coaxial powder feeding laser additive in the 10 th stage 1002008-1 to 1002008-10 of the 'Chinese laser' volume 47, the '10 month' published in 2020, which comprises the steps of testing the fatigue performance of the TA15 titanium alloy after heat treatment, analyzing the structure evolution rule before and after the heat treatment and the influence of defects on the fatigue performance, and the defect is that microscopic structure and fatigue performance of a TA15 titanium alloy manufactured piece formed by selective laser melting are not analyzed. In the fifth month, publication of forging technology, volume 41, and period 5, 407-412, a process for laser melting and forming a selected area of TA15 titanium alloy is disclosed, and the method describes in detail the influence of laser power, scanning speed and increase of scanning channel spacing on the density and microstructure of a TA15 selected area laser melting workpiece, which has the disadvantage that the fatigue performance is not analyzed.
Disclosure of Invention
In order to solve the problems, the invention provides a preparation process method of TA15 titanium alloy with high fatigue life based on selective laser melting forming.
A preparation process method of TA15 titanium alloy with high fatigue life based on selective laser melting forming comprises the following specific steps:
s1, processing raw materials: taking TA15 titanium alloy powder prepared by a plasma rotating electrode method as a raw material, and carrying out vacuum drying treatment on the TA15 titanium alloy powder, wherein the drying temperature is 80-120 ℃, the drying time is 2-4 hours, and the flowability of the dried powder is less than 40s/50g;
S2, constructing a three-dimensional model: creating a three-dimensional model diagram of the microstructure, the stretching, the impact and the fatigue test sample by utilizing three-dimensional model software, and converting the three-dimensional model diagram into an STL format;
s3, model data processing: importing the three-dimensional model diagram of the sample into data processing software for processing, slicing and layering to generate a scanning path;
s4, preparing a forming cabin: cleaning the molding cabin, and wiping the vibrating mirror protection mirror and the substrate by alcohol; inert gas in protective atmosphere, preheat the base plate at the same time;
S5, printing and forming:
a. The forming process parameters are as follows: the laser power of the main body is 180W-200W, the exposure time of the main body is 50 mu s-70 mu s, the distance between main body points is 60 mu m-75 mu m, the distance between scanning tracks is 80 mu m-120 mu m, the laser power of the profile is 175W, the exposure time of the profile is 50 mu s, the distance between profile points is 75 mu s, the thickness of a powder layer is 30 mu m, and a scanning strategy adopts 67 DEG rotation scanning;
b. the forming process comprises the following steps:
① Spreading powder by adopting a silicon rubber soft scraper, and adjusting the fit clearance between the soft scraper and the titanium alloy substrate, wherein the fit clearance is less than or equal to 50 mu m;
② When the substrate is preheated to a set value, starting to spread powder on the substrate by a soft scraper, and observing the surface to be thin;
③ When the gas atmosphere culture of the forming cabin reaches the set oxygen content, printing and forming are started according to set parameters and paths;
④ The reciprocating circulation is performed until the sample is completely processed; ⑤ Opening the forming cabin when the temperature of the substrate is reduced to below 60 ℃, and cleaning the powder to take out the sample and the substrate;
S6, stress relief annealing: after printing, placing the cleaned and taken out sample together with the titanium alloy substrate into a vacuum heat treatment furnace for stress relief annealing;
s7, hot isostatic pressing: placing the sample piece subjected to stress relief annealing and the substrate into a hot isostatic pressing furnace;
s8, wire cutting: separating the sample from the substrate by adopting a linear cutting mode;
S9, machining: finish machining, stretching, impacting and fatigue testing the test specimen;
s10, performance detection: the samples were subjected to microstructure observation, room temperature tensile test, impact test, fatigue test kt=2.5, r=0.06.
The TA15 titanium alloy powder in the step S1 comprises the following components in percentage by weight: the balance of Ti, al 5.8-7.1%, V0.8-0.25%, zr1.5-2.5%, mo 0.5-2.0%, fe less than or equal to 0.25%, C less than or equal to 0.08%, N less than or equal to 0.05%, H less than or equal to 0.015%, O less than or equal to 0.13%, and the grain size range of the powder is less than or equal to 60 mu m.
And (3) reserving a margin of 0.5-1mm on the surface of the substrate during the treatment in the step (S3), and placing the model.
The substrate material in the step S4 is TC4 or TA15, and the flatness is less than or equal to 50 mu m.
The purity of the inert gas in the step S4 is 99.999%; preheating the substrate to 100-170 ℃ and culturing the inert gas atmosphere until the oxygen content is less than or equal to 800ppm.
The working vacuum degree of the step S6 is 6.67 multiplied by 10 < -3 > Pa-6.67 multiplied by 10 < -2 > Pa, the temperature is kept at 800 ℃ to 850 ℃ for 2h to 4h, and the furnace is cooled.
And in the step S7, 99.999% high-purity argon is filled, the temperature is 895-955 ℃, the pressure is more than or equal to 100MPa, the heat preservation and pressure maintaining time is 180+/-60 min, the temperature is cooled to below 425 ℃ along with the furnace, and then the furnace is taken out and cooled in the air.
And when the tensile strength of the microstructure in the step S10 reaches 1043MPa, the elongation after break is 13.5%, the area shrinkage is 34.3%, the impact toughness is 43.5J/cm 2 and 430MPa, the cycle is 504862 times.
The beneficial effects of the invention are as follows: the TA15 titanium alloy powder prepared by a plasma rotating electrode method is selected as a raw material, and the powder has high purity, high density, no hollow powder or satellite powder, narrow particle size distribution, good fluidity and no reduction of tensile strength, so that the problems of low fatigue life and high discreteness of TA15 titanium alloy products formed by selective laser melting are solved, the tensile strength can reach 1040MPa, and the cycle time can reach 50 ten thousand times when Kt=2.5 notch sample stress is 430 MPa.
Drawings
The invention will be further described with reference to the drawings and examples.
FIG. 1 is a graph of the morphology of a TA15 titanium alloy powder according to the present invention;
FIG. 2 is a hollow powder diagram of a TA15 titanium alloy powder according to the present invention;
FIG. 3 is a drawing of a step S9 of the present invention;
FIG. 4 is a schematic impact diagram of step S9 of the present invention;
FIG. 5 is a simplified fatigue diagram of step S9 of the present invention;
FIG. 6 is a microstructure of a TA15 titanium alloy powder according to the present invention;
FIG. 7 is a microstructure of a TA15 titanium alloy powder hollow powder according to the present invention;
FIG. 8 is a schematic diagram of the porosity of an electrode induction aerosolization preparation method molded article of the present invention;
FIG. 9 is a schematic illustration of the porosity of a plasma rotary electrode process molded article of the present invention;
FIG. 10 is a graph of cracks caused by improper influence parameters of TA15 titanium alloy selective laser melting forming process parameters on the cracks;
FIG. 11 is a graph showing reasonable crack-free effect of TA15 titanium alloy selective laser melting forming process parameters on cracks.
Detailed Description
The present invention will be further described in the following to make the technical means, the creation characteristics, the achievement of the purpose and the effect of the present invention easy to understand.
As shown in fig. 1 to 11, a preparation process method of a TA15 titanium alloy with a high fatigue life based on selective laser melting forming comprises the following specific steps:
s1, processing raw materials: taking TA15 titanium alloy powder prepared by a plasma rotating electrode method as a raw material, and carrying out vacuum drying treatment on the TA15 titanium alloy powder, wherein the drying temperature is 80-120 ℃, the drying time is 2-4 hours, and the flowability of the dried powder is less than 40s/50g;
S2, constructing a three-dimensional model: creating a three-dimensional model diagram of the microstructure, the stretching, the impact and the fatigue test sample by utilizing three-dimensional model software, and converting the three-dimensional model diagram into an STL format;
s3, model data processing: importing the three-dimensional model diagram of the sample into data processing software for processing, slicing and layering to generate a scanning path;
s4, preparing a forming cabin: cleaning the molding cabin, and wiping the vibrating mirror protection mirror and the substrate by alcohol; inert gas in protective atmosphere, preheat the base plate at the same time;
S5, printing and forming:
a. The forming process parameters are as follows: the laser power of the main body is 180W-200W, the exposure time of the main body is 50 mu s-70 mu s, the distance between main body points is 60 mu m-75 mu m, the distance between scanning tracks is 80 mu m-120 mu m, the laser power of the profile is 175W, the exposure time of the profile is 50 mu s, the distance between profile points is 75 mu s, the thickness of a powder layer is 30 mu m, and a scanning strategy adopts 67 DEG rotation scanning;
b. the forming process comprises the following steps:
① Spreading powder by adopting a silicon rubber soft scraper, and adjusting the fit clearance between the soft scraper and the titanium alloy substrate, wherein the fit clearance is less than or equal to 50 mu m;
② When the substrate is preheated to a set value, starting to spread powder on the substrate by a soft scraper, and observing the surface to be thin;
③ When the gas atmosphere culture of the forming cabin reaches the set oxygen content, printing and forming are started according to set parameters and paths;
④ The reciprocating circulation is performed until the sample is completely processed; ⑤ Opening the forming cabin when the temperature of the substrate is reduced to below 60 ℃, and cleaning the powder to take out the sample and the substrate;
S6, stress relief annealing: after printing, placing the cleaned and taken out sample together with the titanium alloy substrate into a vacuum heat treatment furnace for stress relief annealing;
s7, hot isostatic pressing: placing the sample piece subjected to stress relief annealing and the substrate into a hot isostatic pressing furnace;
s8, wire cutting: separating the sample from the substrate by adopting a linear cutting mode;
S9, machining: the sample is subjected to finish machining, stretching, impact and fatigue, and the sample dimensions are shown in fig. 3, 4 and 5;
s10, performance detection: the samples were subjected to microstructure observation, room temperature tensile test, impact test, fatigue test kt=2.5, r=0.06.
The TA15 titanium alloy powder in the step S1 comprises the following components in percentage by weight: the balance of Ti, al5.8% -7.1%, V0.8% -0.25%, zr1.5% -2.5%, mo0.5% -2.0%, fe less than or equal to 0.25%, C less than or equal to 0.08%, N less than or equal to 0.05%, H less than or equal to 0.015%, O less than or equal to 0.13%, the particle size range of the powder is less than or equal to 60 mu m, the shape of the powder is nearly spherical, and the shape of the powder is shown in figure 1, and the hollow powder is shown in figure 2.
The conventional technology selects TA15 titanium alloy powder prepared by an electrode induction gas atomization preparation method, the powder has wide particle size distribution, hollow powder and satellite particles exist, the particle size distribution is wide, the fine powder amount is large in proportion, the powder paving fluidity can be influenced, and the hollow powder and the satellite particles can form defects in the selective laser melting process, so that the fatigue life is influenced.
The TA15 titanium alloy powder prepared by a plasma rotating electrode method is used as a raw material, and the powder has the advantages of high purity, high density, no hollow powder or satellite powder, narrow particle size distribution, good fluidity, and the pore distribution of a formed product is shown in fig. 8 and 9, and the specific comparison is as follows:
table 1 comparison of powder characteristics for two preparation methods
The TA15 titanium alloy powder prepared by a plasma rotating electrode method is selected as a raw material, and the powder has high purity, high density, no hollow powder or satellite powder, narrow particle size distribution, good fluidity and no reduction of tensile strength, so that the problems of low fatigue life and high discreteness of TA15 titanium alloy products formed by selective laser melting are solved, the tensile strength can reach 1040MPa, and the cycle time can reach 50 ten thousand times when Kt=2.5 notch sample stress is 430 MPa.
And (3) reserving a margin of 0.5-1mm on the surface of the substrate during the treatment in the step (S3), and placing the model.
Specifically, the TA15 titanium alloy is a near alpha-type high-temperature titanium alloy, and the research on alpha-beta type TC4 titanium alloy is more at present, but the research on selective laser melting forming of the TA15 titanium alloy is less.
In the selective laser melting forming process, defects and cracks can appear due to improper selection of process parameters due to the thermophysical properties of the TA15 titanium alloy powder, as shown in fig. 10 and 11, so that the tensile properties and the fatigue life of the product are seriously affected.
The invention designs TA15 titanium alloy selective laser melting forming technological parameters by adopting an orthogonal test method on the basis of TC4 titanium alloy forming technological parameters.
The substrate is preheated to (100-170) DEG C before printing, the temperature difference is reduced, the scanning channel interval is overlarge, the single-channel molten pool interval is large, the surface of a workpiece is concave, and the remelting part of the overlarge single-channel molten pool is too much and influences the forming efficiency, so that 80-120 mu m is most suitable; the laser power is too high, the internal heat is high, the thermal stress is high, the unmelted phenomenon is easy to occur in the excessively small powder, and the defect is large, so that 180W-200W is selected.
The body and the outline powder have different melting states, so that the parameters are slightly different, and the formed product has high density, low porosity and few internal defects by adopting the forming process parameters.
The substrate material in the step S4 is TC4 or TA15, and the flatness is less than or equal to 50 mu m.
The purity of the inert gas in the step S4 is 99.999%; preheating the substrate to 100-170 ℃ and culturing the inert gas atmosphere until the oxygen content is less than or equal to 800ppm.
The working vacuum degree of the step S6 is 6.67 multiplied by 10 < -3 > Pa-6.67 multiplied by 10 < -2 > Pa, the temperature is kept at 800 ℃ to 850 ℃ for 2h to 4h, and the furnace is cooled.
And in the step S7, 99.999% high-purity argon is filled, the temperature is 895-955 ℃, the pressure is more than or equal to 100MPa, the heat preservation and pressure maintaining time is 180+/-60 min, the temperature is cooled to below 425 ℃ along with the furnace, and then the furnace is taken out and cooled in the air.
The invention adopts dual regulation and control of internal structure and defects of a workpiece by adopting stress relief annealing and hot isostatic pressing, beta columnar crystals which penetrate through a plurality of deposition layers and grow epitaxially are distributed on the deposition-state section of the workpiece by selective laser melting, the adjacent beta columnar crystals are alternately distributed in bright and dark due to different grain orientations, a large number of needle-shaped martensite alpha' phases are alternately distributed in the columnar crystals, and a small number of internal pores and unmelted defects exist, so that the fatigue life of a deposition-state sample is low.
Firstly, in the stress relief annealing process of preserving heat for 2h to 4h at 800 ℃ to 850 ℃, the strip-shaped beta phase and the quaternary alpha ' martensite are separated out from the boundary of the primary, secondary and tertiary needle-shaped alpha ' martensite, and are converted into the beta phase, and in the heat preservation process, the needle-shaped alpha ' phase is continuously coarsened to form a strip shape, so that the basket structure consisting of the alpha phase and the beta phase is finally obtained, and the basket structure has good fatigue strength and prolonged fatigue life.
Finally, the TA15 titanium alloy structure defect is further regulated through hot isostatic pressing, alpha phase is further promoted to be nucleated and converted into lamellar along the boundary of martensite alpha', meanwhile, beta phase is continuously increased after beta same crystal element is separated out at the temperature of 895-955 ℃, lamellar alpha phase is continuously grown and lamellar spacing of beta phase is continuously increased and internal pores are closed under the time of Wen Baoya (180+/-60) min, remelting of unmelted powder is started, and the pores of the TA15 titanium alloy part are further reduced and defects are further eliminated, so that the fatigue life is further prolonged.
In the step S10, the microstructure is a basket structure, and when the tensile strength reaches 1043MPa, the elongation after fracture is 13.5%, the area reduction rate is 34.3%, and the impact toughness is 43.5J/cm < 2 >, 430MPa, the cycle is 504862 times.
The invention has simple process flow and short period, obviously provides fatigue life on the premise of keeping tensile strength not reduced, promotes the application of the selected area laser melting TA15 titanium alloy part in the aviation field, and has important significance, and specific comparison data are as follows:
Table 1 comparative data
The forming probability of internal defects of the workpiece is reduced by controlling the powder characteristics of the TA15 titanium alloy raw material; regulating and controlling the microstructure and defects of the workpiece by regulating the forming process parameters, and inhibiting cracks and cracking; the microstructure and defect elimination are further regulated and controlled through dual heat treatment of stress annealing and hot isostatic pressing, the fatigue life of the TA15 titanium alloy selective laser melting forming workpiece is obviously prolonged on the basis of not reducing the strength, and finally the selective laser melting forming TA15 titanium alloy is promoted to be widely applied in the aviation field.
The foregoing has shown and described the basic principles, principal features and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, and that the above embodiments and descriptions are merely illustrative of the principles of the present invention, and various changes and modifications may be made without departing from the spirit and scope of the invention, which is defined in the appended claims. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (8)
1. A preparation process method of TA15 titanium alloy with high fatigue life based on selective laser melting and forming is characterized by comprising the following steps: the method comprises the following specific steps:
s1, processing raw materials: taking TA15 titanium alloy powder prepared by a plasma rotating electrode method as a raw material, and carrying out vacuum drying treatment on the TA15 titanium alloy powder, wherein the drying temperature is 80-120 ℃, the drying time is 2-4 hours, and the flowability of the dried powder is less than 40s/50g;
S2, constructing a three-dimensional model: creating a three-dimensional model diagram of the microstructure, the stretching, the impact and the fatigue test sample by utilizing three-dimensional model software, and converting the three-dimensional model diagram into an STL format;
s3, model data processing: importing the three-dimensional model diagram of the sample into data processing software for processing, slicing and layering to generate a scanning path;
s4, preparing a forming cabin: cleaning the molding cabin, and wiping the vibrating mirror protection mirror and the substrate by alcohol; inert gas in protective atmosphere, preheat the base plate at the same time;
S5, printing and forming:
a. The forming process parameters are as follows: the laser power of the main body is 180W-200W, the exposure time of the main body is 50 mu s-70 mu s, the distance between main body points is 60 mu m-75 mu m, the distance between scanning tracks is 80 mu m-120 mu m, the laser power of the profile is 175W, the exposure time of the profile is 50 mu s, the distance between profile points is 75 mu s, the thickness of a powder layer is 30 mu m, and a scanning strategy adopts 67 DEG rotation scanning;
b. the forming process comprises the following steps:
① Spreading powder by adopting a silicon rubber soft scraper, and adjusting the fit clearance between the soft scraper and the titanium alloy substrate, wherein the fit clearance is less than or equal to 50 mu m;
② When the substrate is preheated to a set value, starting to spread powder on the substrate by a soft scraper, and observing the surface to be thin;
③ When the gas atmosphere culture of the forming cabin reaches the set oxygen content, printing and forming are started according to set parameters and paths;
④ The reciprocating circulation is performed until the sample is completely processed; ⑤ Opening the forming cabin when the temperature of the substrate is reduced to below 60 ℃, and cleaning the powder to take out the sample and the substrate;
S6, stress relief annealing: after printing, placing the cleaned and taken out sample together with the titanium alloy substrate into a vacuum heat treatment furnace for stress relief annealing;
s7, hot isostatic pressing: placing the sample piece subjected to stress relief annealing and the substrate into a hot isostatic pressing furnace;
s8, wire cutting: separating the sample from the substrate by adopting a linear cutting mode;
S9, machining: finish machining, stretching, impacting and fatigue testing the test specimen;
s10, performance detection: the samples were subjected to microstructure observation, room temperature tensile test, impact test, fatigue test kt=2.5, r=0.06.
2. The preparation process method of the TA15 titanium alloy with the high fatigue life based on selective laser melting forming is characterized by comprising the following steps of: the TA15 titanium alloy powder in the step S1 comprises the following components in percentage by weight: the balance of Ti, al 5.8-7.1%, V0.8-0.25%, zr1.5-2.5%, mo 0.5-2.0%, fe less than or equal to 0.25%, C less than or equal to 0.08%, N less than or equal to 0.05%, H less than or equal to 0.015%, O less than or equal to 0.13%, and the grain size range of the powder is less than or equal to 60 mu m.
3. The preparation process method of the TA15 titanium alloy with the high fatigue life based on selective laser melting forming is characterized by comprising the following steps of: and (3) reserving a margin of 0.5-1mm on the surface of the substrate during the treatment in the step (S3), and placing the model.
4. The preparation process method of the TA15 titanium alloy with the high fatigue life based on selective laser melting forming is characterized by comprising the following steps of: the substrate material in the step S4 is TC4 or TA15, and the flatness is less than or equal to 50 mu m.
5. The preparation process method of the TA15 titanium alloy with the high fatigue life based on selective laser melting forming is characterized by comprising the following steps of: the purity of the inert gas in the step S4 is 99.999%; preheating the substrate to 100-170 ℃ and culturing the inert gas atmosphere until the oxygen content is less than or equal to 800ppm.
6. The preparation process method of the TA15 titanium alloy with the high fatigue life based on selective laser melting forming is characterized by comprising the following steps of: the working vacuum degree of the step S6 is 6.67 multiplied by 10 < -3 > Pa-6.67 multiplied by 10 < -2 > Pa, the temperature is kept at 800 ℃ to 850 ℃ for 2h to 4h, and the furnace is cooled.
7. The preparation process method of the TA15 titanium alloy with the high fatigue life based on selective laser melting forming is characterized by comprising the following steps of: and in the step S7, 99.999% high-purity argon is filled, the temperature is 895-955 ℃, the pressure is more than or equal to 100MPa, the heat preservation and pressure maintaining time is 180+/-60 min, the temperature is cooled to below 425 ℃ along with the furnace, and then the furnace is taken out and cooled in the air.
8. The preparation process method of the TA15 titanium alloy with the high fatigue life based on selective laser melting forming is characterized by comprising the following steps of: and when the tensile strength of the microstructure in the step S10 reaches 1043MPa, the elongation after break is 13.5%, the area shrinkage is 34.3%, the impact toughness is 43.5J/cm 2 and 430MPa, the cycle is 504862 times.
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| CN114985765B (en) * | 2022-08-03 | 2022-10-25 | 北京煜鼎增材制造研究院有限公司 | Laser melting direct material increase method for titanium alloy blisk selected area |
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|---|---|---|---|---|
| CN112981177A (en) * | 2021-02-20 | 2021-06-18 | 上海交通大学 | Titanium alloy powder capable of being used for selective laser melting 3D printing, selective laser melting titanium alloy and preparation thereof |
| CN113020624A (en) * | 2021-03-10 | 2021-06-25 | 西北工业大学 | Heat treatment method of laser stereo-forming TC4 titanium alloy |
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