CN110777286B - Preparation method of medium-strength weldable corrosion-resistant scandium-containing high-magnesium aluminum alloy forging - Google Patents
Preparation method of medium-strength weldable corrosion-resistant scandium-containing high-magnesium aluminum alloy forging Download PDFInfo
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Abstract
本发明涉及一种中强可焊耐蚀含钪高镁铝合金锻件的制备方法。本发明在300℃～400℃对含钪镁铝合金锭进行均匀化退火；然后升温至400℃～450℃；保温，保温后进行第一阶段锻造墩粗；第一阶段墩粗的锻造比为1.03‑1.08；得到预切长样；然后对所得预切长样进行挤压处理；接着进行第二阶段锻造墩粗；第二阶段锻造过程中，最后一火锻造的温度控制为280～300℃。所述含钪镁铝合金锭含有Mg，Mn，Sc，Zr，Ti，Be等元素。本发明制备的中强可焊耐蚀含钪高镁铝合金锻件在满足材料加工工艺性能的前提下，其屈服强度性能较5A06合金提高100％以上。The invention relates to a preparation method for a medium-strength weldable, corrosion-resistant, scandium-containing high-magnesium aluminum alloy forging. In the present invention, the scandium-magnesium-aluminum alloy ingots are homogenized and annealed at 300° C. to 400° C.; then the temperature is raised to 400° C. to 450° C.; the temperature is maintained, and the first-stage forging is performed after the heat-preservation; 1.03-1.08; obtain pre-cut long samples; then extrude the obtained pre-cut long samples; then carry out the second-stage forging and thickening; in the second-stage forging process, the temperature of the last fire forging is controlled at 280-300°C . The scandium-containing magnesium-aluminum alloy ingot contains elements such as Mg, Mn, Sc, Zr, Ti, and Be. On the premise of satisfying the material processing performance, the medium-strength, weldable, corrosion-resistant, and scandium-containing high-magnesium aluminum alloy forgings prepared by the invention have a yield strength performance that is more than 100 percent higher than that of the 5A06 alloy.
Description
Technical Field
The invention relates to a preparation method of a medium-strength weldable corrosion-resistant scandium-containing high-magnesium aluminum alloy forging; belonging to the technical field of special magnesium alloy processing.
Background
Scandium-containing aluminum alloys are a promising aluminum alloy structural material; it has certain application in spaceflight, nuclear energy and ship. As for the research of scandium-containing aluminum alloys, a lot of work has been done, and as in the Onagawa institute of aviation and the Onagawa institute of light metals, Sc-containing aluminum alloys of more than ten brands such as Al-Mg-SC (01575, 01571, 01570, 01545, 01535, 01515), Al-Zn-Mg-Sc (01970, 01975), Al-Mg-Li-Sc (01421, 01423), Al-Cu-Li-Sc (01460), Al-Zn-Mg-Cu-Sc (01981) have been developed.
A great deal of research is also being conducted on the processing method of scandium-containing aluminum alloys; for example, the influence of the temperature and time of stabilizing annealing on the strength, plasticity and corrosion resistance of a product is researched in a paper 'influence of stabilizing annealing on the mechanics and corrosion resistance of an aluminum-magnesium-scandium alloy'; the influence of stabilizing annealing on the structure and the performance of the aluminum-magnesium-scandium alloy is also researched in the text of the influence of stabilizing annealing on the structure and the performance of the aluminum-magnesium-scandium alloy by the single intelligence growth; the influence of ingot homogenization, processing heat treatment on the alloy structure performance and the product welding performance is explored in the research on the strong weldable aluminum magnesium scandium alloy plate preparation and welding performance of the master thesis. However, the processing method adopted by the process is as follows: ingot casting, homogenizing annealing, hot rolling, intermediate annealing, cold rolling and forming to obtain a plate, and performing stabilizing annealing on the plate to obtain a finished product. Some attempts have been made to forge scandium-containing aluminum alloy, for example, the structural property influence of Sc on the forging blank of equal-temperature composite forging 2a14 aluminum alloy hub is studied in the text of research on the structure and performance of equal-temperature composite forging 2a14 aluminum alloy hub by scandium, by shogahong, etc. For example, the application of the forging technology in the aluminum alloy is also explored and summarized in the article of aluminum alloy forging technology compiled by Liu Jing Ming.
But so far: preparing a medium-strength weldable corrosion-resistant scandium-containing high-magnesium aluminum alloy with excellent performance by adopting forging-extrusion-forging and strictly controlling the temperature of final one-fire forging; there are few reports.
Disclosure of Invention
Aiming at the defects of the prior art, the invention firstly provides a method for preparing the medium-strength weldable corrosion-resistant scandium-containing high-magnesium aluminum alloy with excellent performance by adopting forging-extrusion-forging and strictly controlling the temperature of final one-fire forging.
The invention relates to a preparation method of a medium-strength weldable corrosion-resistant scandium-containing high-magnesium aluminum alloy forging; which comprises the following steps;
step one
Carrying out homogenization annealing on the scandium-containing magnesium-aluminum alloy ingot at 320-380 ℃, preferably 350 ℃; then heating to 400-420 ℃, preferably keeping the temperature at 410 ℃, and forging and upsetting at the first stage after keeping the temperature; the forging ratio of the upsetting in the first stage is 1.03-1.08, preferably 1.05-1.06; obtaining a precut long sample; the scandium-containing magnesium-aluminum alloy ingot comprises the following metal elements in percentage by mass:
Mg：4.2％～6.5％，
Mn：0.15％～0.40％，
Sc：0.20％～0.40％，
Zr：0.10％～0.13％，
Ti：0.02％～0.05％，
Be：0.0005％～0.005％，
Si≤0.10％，
Fe≤0.20％，
less than or equal to 0.05 percent of single impurity and less than or equal to 0.15 percent of total impurity,
the balance of Al;
step two
Extruding the precut long sample obtained in the step one; obtaining a cut long sample; the temperature of the extrusion treatment is 300-400 ℃;
step three
Heating the cut long sample obtained in the step two to 400-450 ℃; preserving heat; then forging and upsetting are carried out at the second stage; obtaining the medium-strength weldable corrosion-resistant scandium-containing high-magnesium aluminum alloy forging; in the second stage forging process, the temperature of the last hot forging is controlled to be 280-300 ℃, preferably 290 ℃, and the deformation of the last hot forging is 25-30%; the total deformation of the second stage forging is 60-70%.
As a preferred embodiment; the invention relates to a preparation method of a medium-strength weldable corrosion-resistant scandium-containing high-magnesium aluminum alloy forging; the scandium-containing magnesium-aluminum alloy comprises the following components in percentage by mass:
Mg：5.5％，
Mn：0.25％，
Sc：0.30％，
Zr：0.11％，
Ti：0.03％，
Be：0.003％，
Si≤0.08％，
Fe≤0.18％，
less than or equal to 0.05 percent of single impurity and less than or equal to 0.15 percent of total impurity,
the balance being Al.
As a preferred embodiment; the invention relates to a preparation method of a medium-strength weldable corrosion-resistant scandium-containing high-magnesium aluminum alloy forging; in the second step, the extrusion coefficient is 8.3.
As a preferred embodiment; the invention relates to a preparation method of a medium-strength weldable corrosion-resistant scandium-containing high-magnesium aluminum alloy forging; in the first step, the scandium-containing magnesium-aluminum alloy ingot is prepared by the following steps:
step A batching
Preparing a pure aluminum ingot, a pure magnesium ingot, an aluminum-manganese intermediate alloy, a zirconium composite salt, an aluminum-scandium intermediate alloy, an aluminum-titanium intermediate alloy and an aluminum-beryllium intermediate alloy according to design components;
step B melting
B1, adding the pure aluminum ingot, the aluminum-manganese intermediate alloy, the zirconium composite salt and the aluminum-titanium intermediate alloy weighed in the step one into a smelting furnace, smelting into a melt at 740-760 ℃, raising the temperature to 800-810 ℃, adding the aluminum-scandium intermediate alloy, carrying out first stirring, keeping the temperature for 20-25 min after the temperature of the melt is raised to 800-810 ℃, carrying out second stirring again, keeping the temperature for 20-25 min after the temperature of the melt is raised to 800-810 ℃, carrying out third stirring, keeping the temperature for 20-25 min after the temperature of the melt is raised to 800-810 ℃ again, and carrying out fourth stirring to obtain a melt;
b2, cooling the melt obtained from B1, adding a pure magnesium ingot when the temperature of the melt is reduced to 700-720 ℃, simultaneously adding the middle part of aluminum and beryllium, and fully stirring to obtain an aluminum alloy melt;
b3, adding a covering agent according to 0.2-0.5 percent of the mass of the aluminum alloy melt in the smelting furnace;
b4, refining the aluminum alloy melt treated by the B3 with Ar gas for 15-25 min, and standing for 30-50 min to obtain an aluminum alloy melt;
step C casting
Controlling the temperature of the aluminum alloy melt obtained from B4 at 735-750 ℃, preferably 750 ℃, and carrying out water-cooling casting to obtain the scandium-containing high-magnesium aluminum alloy.
As a further preferred embodiment; the invention relates to a preparation method of a medium-strength weldable corrosion-resistant scandium-containing high-magnesium aluminum alloy forging; in the step A, the zirconium element in the aluminum zirconium intermediate alloy is not higher than 5%.
As a further preferred embodiment; the invention relates to a preparation method of a medium-strength weldable corrosion-resistant scandium-containing high-magnesium aluminum alloy forging; in the following steps: the Ar gas in B4 is high-purity argon gas with the purity of more than or equal to 95 percent.
As a further preferred embodiment; the invention relates to a preparation method of a medium-strength weldable corrosion-resistant scandium-containing high-magnesium aluminum alloy forging; and C, controlling the water pressure to be 0.01-0.02 MPa, preferably 0.015MPa and the casting speed to be 20-25 mm/min, preferably 22mm/min during water-cooling casting in the step C.
As a preferred embodiment; the invention relates to a preparation method of a medium-strength weldable corrosion-resistant scandium-containing high-magnesium aluminum alloy forging; the time of the homogenizing annealing in the step one is 4-6 h, preferably 5 h. Discharging and air cooling after homogenizing annealing.
As a preferred embodiment; the invention relates to a preparation method of a medium-strength weldable corrosion-resistant scandium-containing high-magnesium aluminum alloy forging; in the first step, after carrying out homogenization annealing on scandium-containing magnesium aluminum alloy ingots, heating to 400-420 ℃, preferably 410 ℃; and preserving the heat for 10-12 h, preferably 10 h.
As a preferred embodiment; the invention relates to a preparation method of a medium-strength weldable corrosion-resistant scandium-containing high-magnesium aluminum alloy forging; in the first step, when forging and upsetting are carried out in the first stage, the temperature of a blank is controlled to be 400-420 ℃.
As a preferred embodiment; the invention relates to a preparation method of a medium-strength weldable corrosion-resistant scandium-containing high-magnesium aluminum alloy forging; in the first step, after the upsetting in the first stage is finished, whether a small amount of drawing treatment is needed or not is determined according to the surface quality of the sample.
As a preferred embodiment; the invention relates to a preparation method of a medium-strength weldable corrosion-resistant scandium-containing high-magnesium aluminum alloy forging; in the third step, the cut long sample obtained in the second step is heated to 400-420 ℃; keeping the temperature for 1.5-3 h, preferably for 2 h; then, the second stage forging upsetting is performed.
The invention relates to a preparation method of a medium-strength weldable corrosion-resistant scandium-containing high-magnesium aluminum alloy forging; the tensile strength of the product obtained in the step three is 385-390MPa, the yield strength is 245-250MPa, the elongation is 22-25 percent, and the spalling corrosion resistance is N grade.
The invention relates to a preparation method of a medium-strength weldable corrosion-resistant scandium-containing high-magnesium aluminum alloy forging; the product obtained in step three has a compatibility result with high concentrations of hydrogen peroxide that the annual corrosion rate of the liquid phase is less than 0.0254 mm.
The invention relates to a preparation method of a medium-strength weldable corrosion-resistant scandium-containing high-magnesium aluminum alloy forging; please provide the obtained forged piece after welding; the welding strength coefficient is larger than 0.85, the welding wire used for welding is made of 5B71 welding wire, and the welding process is automatic MIG.
When applied industrially; the medium-strength weldable corrosion-resistant scandium-containing high-magnesium aluminum alloy forged piece obtained in the third step; the machining can be directly carried out. Can be directly used after machining. According to the invention, the forging with excellent performance is obtained through the synergistic effect of the components and the preparation process.
On the premise of meeting the processing technological properties of the material, the medium-strength weldable corrosion-resistant scandium-containing high-magnesium aluminum alloy forging piece designed and prepared by the invention has the yield strength property improved by more than 100% compared with that of 5A06 alloy, the welding strength coefficient improved by more than 5%, and higher compatibility with high-concentration hydrogen peroxide, so that the alloy can meet the requirements of materials for structural members for aerospace aircraft such as a fuel storage tank of a spacecraft.
Meanwhile, the process designed by the invention can also be applied to the manufacturing of other aluminum alloys.
The invention has the beneficial effects that:
1) compared with the existing aluminum-magnesium alloy, the medium-strength weldable corrosion-resistant scandium-containing high-magnesium aluminum alloy of the invention is added with Sc, Zr and Ti elements in a compounding way, and Al is generated in the casting process3The (ScZr) particles can be used as the core of as-cast heterogeneous nucleation, and can be used for refining as-cast grains, improving the recrystallization temperature of the alloy and performing the functions of fine grain strengthening and substructure strengthening.
2) On the basis of the traditional ingot metallurgy technology, the invention promotes Al to be in the condition of heat preservation for 4-6 h under the condition that the temperature of the ingot is 320-380 DEG C3Sc、Al3Zr and Al3The dispersed precipitation of (ScZr) particles plays roles in suppressing recrystallization and strengthening in the subsequent hot working process.
3) The invention breaks through the production process of the traditional forge piece, adopts the modes of forging, extruding, forging and controlling the finish forging temperature, avoids the problems of easy cracking of the high-magnesium alloy forging and obvious anisotropy of the performance of the forge piece, and simultaneously effectively improves the tensile strength and the yield strength of the alloy. Meanwhile, the forging prepared by the method can be directly utilized without subsequent heat treatment.
Drawings
FIG. 1 is a transmission electron micrograph of the product obtained in example 3.
It can be seen from FIG. 1 that there is a nano-scale diffuse distribution of Al in the tissue3The (ScZr) particles can play a role in pinning dislocations and pinning grain boundaries, thereby playing a role in strengthening and inhibiting recrystallization.
Detailed Description
Example 1
In this embodiment, a method for manufacturing a medium-strength weldable corrosion-resistant scandium-containing high magnesium aluminum alloy forging includes the following steps:
firstly, preparing materials: according to the mass percentage of each element in the medium-strength weldable corrosion-resistant scandium-containing high-magnesium aluminum alloy forging as Mg: 4.2%, Mn: 0.15%, Sc: 0.20%, Zr: 0.10%, Ti: 0.02%, Be: 0.0005 percent and the balance of Al, and weighing a pure aluminum ingot, a pure magnesium ingot, an aluminum-manganese intermediate alloy, a zirconium composite salt, an aluminum-titanium intermediate alloy and an aluminum-beryllium intermediate alloy.
Secondly, smelting: A. adding the pure aluminum ingot, the aluminum-manganese intermediate alloy, the zirconium composite salt and the aluminum-titanium intermediate alloy weighed in the step one into a smelting furnace, smelting into a melt at 740-760 ℃, raising the temperature to 800-810 ℃, adding the aluminum-scandium intermediate alloy, carrying out first stirring after adding the aluminum-scandium intermediate alloy, carrying out heat preservation for 20min and then carrying out second stirring after the temperature of the melt is raised to 800-810 ℃, carrying out heat preservation for 20min after the temperature of the melt is raised to 800-810 ℃, carrying out third stirring, carrying out heat preservation for 20min after the third stirring, and carrying out fourth stirring after continuing heat preservation for 20min to obtain a melt; B. c, cooling the melt obtained in the step A, adding a pure magnesium ingot when the temperature of the melt is reduced to 720 ℃, simultaneously adding the aluminum beryllium, and fully stirring to obtain an aluminum alloy melt; C. adding a covering agent according to 0.2-0.5% of the mass of the aluminum alloy melt in the smelting furnace; D. refining the aluminum alloy melt treated in the step C for 15min by using Ar gas, and standing for 30min to obtain an aluminum alloy melt;
thirdly, casting: casting the aluminum alloy melt at 735-750 ℃ and 0.01-0.02 MPa and at 20-25 mm/min to obtain an alloy ingot with the diameter of 482mm and the length of 1500 mm;
fourthly, homogenizing annealing: keeping the temperature of the alloy ingot obtained in the step three for 4 hours at the temperature of 320 ℃, and cooling in the air after discharging;
fifthly, forging: turning the diameter of the alloy ingot processed in the fourth step to phi 405-415 mm, sawing the alloy ingot to 1000mm in length, placing the alloy ingot on a material frame to avoid scratching the surface of the ingot, placing the alloy ingot in a heating furnace to heat the ingot, keeping the temperature of the ingot at 400 ℃, keeping the temperature for 10 hours, discharging the ingot, and forging and upsetting the ingot in the first stage; forging according to a forging 6 process (the vertical center point returns to the original point) until:
drawing to 950mm +5mm in the forging 2 and 4 processes; sawing the lathe leather to phi 400mm +/-5 mm multiplied by 550mm +5mm, extruding at the extrusion temperature of 380 ℃, and cutting to length of 400 mm; loading the ingot blank into a heating furnace for heating, measuring the ingot casting temperature to be 400 ℃, preserving the heat for 2 hours, discharging the ingot blank, and performing second-stage forging (except the final fire forging, the temperature of other forging is 380-420 ℃), wherein the temperature of the final fire forging is 280-300 ℃; forging to a length of 90mm, wherein the forging ratio of the last hot forging is 4-5; and obtaining the alloy forging blank.
The obtained alloy forging blank has tensile strength of 388MPa, yield strength of 247MPa, elongation of 22 percent and stripping corrosion resistance of N grade.
The alloy forging blank obtained has the compatibility result of the alloy forging blank and high-concentration hydrogen peroxide, and the liquid phase annual corrosion speed is less than 0.0254 mm.
Obtaining an alloy forging blank; and machining to the size of the finished product.
Welding the obtained alloy forging blank or the machined product;
the welding strength coefficient is larger than 0.85, the welding wire used for welding is made of 5B71 welding wire, and the welding process is automatic MIG.
Example 2
In this embodiment, a method for manufacturing a medium-strength weldable corrosion-resistant scandium-containing high magnesium aluminum alloy forging includes the following steps:
firstly, preparing materials: according to the mass percentage of each element in the medium-strength weldable corrosion-resistant scandium-containing high-magnesium aluminum alloy forging as Mg: 6.5%, Mn: 0.4%, Sc: 0.40%, Zr: 0.13%, Ti: 0.05%, Be: 0.005 percent and the balance of Al, and weighing a pure aluminum ingot, a pure magnesium ingot, an aluminum-manganese intermediate alloy, a zirconium composite salt, an aluminum-titanium intermediate alloy and an aluminum-beryllium intermediate alloy.
Secondly, smelting: A. adding the pure aluminum ingot, the aluminum-manganese intermediate alloy, the zirconium composite salt and the aluminum-titanium intermediate alloy weighed in the step one into a smelting furnace, smelting into a melt at 740-760 ℃, raising the temperature to 800-810 ℃, adding the aluminum-scandium intermediate alloy, carrying out first stirring after adding the aluminum-scandium intermediate alloy, carrying out heat preservation for 20min and then carrying out second stirring after the temperature of the melt is raised to 800-810 ℃, carrying out heat preservation for 20min after the temperature of the melt is raised to 800-810 ℃, carrying out third stirring, carrying out heat preservation for 20min after the third stirring, and carrying out fourth stirring after continuing heat preservation for 20min to obtain a melt; B. c, cooling the melt obtained in the step A, adding a pure magnesium ingot when the temperature of the melt is reduced to 720 ℃, simultaneously adding the aluminum beryllium, and fully stirring to obtain an aluminum alloy melt; C. adding a covering agent according to 0.2-0.5% of the mass of the aluminum alloy melt in the smelting furnace; D. refining the aluminum alloy melt treated in the step C for 15min by using Ar gas, and standing for 30min to obtain an aluminum alloy melt;
thirdly, casting: casting the aluminum alloy melt at 735-750 ℃ under the conditions that the water pressure is 0.01-0.02 MPa and the speed is 20-25 mm/min to obtain an alloy ingot with the diameter of 482mm and the length of 1500-4500 mm;
fourthly, homogenizing annealing: keeping the temperature of the alloy ingot obtained in the step three at 380 ℃ for 6h, and cooling in the air after discharging;
fifthly, forging: turning the diameter of the alloy ingot processed in the fourth step to phi 405-415 mm, sawing the alloy ingot to 1000mm in length, placing the alloy ingot on a material frame to avoid scratching the surface of the ingot, placing the alloy ingot in a heating furnace to heat the ingot, keeping the temperature of the ingot at 400 ℃, keeping the temperature for 10 hours, discharging the ingot, and forging and upsetting the ingot in the first stage; forging according to a forging 6 process (the vertical center point returns to the original point) until:
drawing to 950mm +5mm in the forging 2 and 4 processes; after the leather is turned, extruding at the extrusion temperature of 380 ℃,then putting the ingot blank into a heating furnace to heat the ingot blank, measuring the ingot casting temperature to be 400 ℃, preserving the heat for 2 hours, discharging the ingot blank, and forging the second stage and forging the final hot forging at the temperature of 280-300 ℃; forging to a length of 90 mm; and obtaining the alloy forging blank.
The obtained alloy forging blank has the tensile strength of 385MPa, the yield strength of 245MPa, the elongation of 23 percent and the anti-stripping corrosion performance of N grade.
The alloy forging blank obtained has the compatibility result of the alloy forging blank and high-concentration hydrogen peroxide, and the liquid phase annual corrosion speed is less than 0.0254 mm.
Obtaining an alloy forging blank; and machining to the size of the finished product.
Welding the obtained alloy forging blank or the machined product;
the welding strength coefficient is larger than 0.85, the welding wire used for welding is made of 5B71 welding wire, and the welding process is automatic MIG.
Example 3
In this embodiment, a method for manufacturing a medium-strength weldable corrosion-resistant scandium-containing high magnesium aluminum alloy forging includes the following steps:
firstly, preparing materials: according to the mass percentage of each element in the medium-strength weldable corrosion-resistant scandium-containing high-magnesium aluminum alloy forging as Mg: 5.5%, Mn: 0.25%, Sc: 0.30%, Zr: 0.11%, Ti: 0.03%, Be: 0.003 percent of the balance of Al, and weighing a pure aluminum ingot, a pure magnesium ingot, an aluminum-manganese intermediate alloy, a zirconium composite salt, an aluminum-titanium intermediate alloy and an aluminum-beryllium intermediate alloy.
Secondly, smelting: A. adding the pure aluminum ingot, the aluminum-manganese intermediate alloy, the zirconium composite salt and the aluminum-titanium intermediate alloy weighed in the step one into a smelting furnace, smelting into a melt at 740-760 ℃, raising the temperature to 800-810 ℃, adding the aluminum-scandium intermediate alloy, carrying out first stirring after adding the aluminum-scandium intermediate alloy, carrying out heat preservation for 20min and then carrying out second stirring after the temperature of the melt is raised to 800-810 ℃, carrying out heat preservation for 20min after the temperature of the melt is raised to 800-810 ℃, carrying out third stirring, carrying out heat preservation for 20min after the third stirring, and carrying out fourth stirring after continuing heat preservation for 20min to obtain a melt; B. c, cooling the melt obtained in the step A, adding a pure magnesium ingot when the temperature of the melt is reduced to 720 ℃, simultaneously adding the aluminum beryllium, and fully stirring to obtain an aluminum alloy melt; C. adding a covering agent according to 0.2-0.5% of the mass of the aluminum alloy melt in the smelting furnace; D. refining the aluminum alloy melt treated in the step C by using Ar gas for 15-20 min, and standing for 30-50 min to obtain an aluminum alloy melt;
thirdly, casting: casting the aluminum alloy melt at 735-750 ℃ under the conditions that the water pressure is 0.01-0.02 MPa and the speed is 20-25 mm/min to obtain an alloy ingot with the diameter of 482mm and the length of 1500-4500 mm;
fourthly, homogenizing annealing: keeping the temperature of the alloy ingot obtained in the step three for 5 hours at the temperature of 350 ℃, and cooling in the air after discharging;
fifthly, forging: turning the diameter of the alloy ingot processed in the fourth step to phi 405-415 mm, sawing the alloy ingot to 1000mm in length, placing the alloy ingot on a material frame to avoid scratching the surface of the ingot, placing the alloy ingot in a heating furnace to heat the ingot, keeping the temperature of the ingot at 400-450 ℃, keeping the temperature for 10h, discharging the ingot, and forging and upsetting the ingot in the first stage; forging according to a forging 6 process (the vertical center point returns to the original point) until:
drawing to 950mm +5mm in the forging 2 and 4 processes; after turning the leather, extruding at the extrusion temperature of 380 ℃ and cutting to length of 400 mm; loading the ingot blank into a heating furnace for heating, measuring the ingot casting temperature to be 400-420 ℃, preserving the heat for 2h, discharging the ingot blank, and performing second-stage forging (except the final fire forging, the temperature of other forging is 380-420 ℃), wherein the temperature of the final fire forging is 280-300 ℃; forging to a length of 90mm, wherein the forging ratio of the last hot forging is 4-5; and obtaining the alloy forging blank.
The obtained alloy forging blank has the tensile strength of 390MPa, the yield strength of 250MPa and the elongation of 25 percent, and the exfoliation corrosion resistance of N grade.
The alloy forging blank obtained has the compatibility result of the alloy forging blank and high-concentration hydrogen peroxide, and the liquid phase annual corrosion speed is less than 0.0254 mm.
Obtaining an alloy forging blank; and machining to the size of the finished product.
Welding the obtained alloy forging blank or the machined product;
the welding strength coefficient is larger than 0.85, the welding wire used for welding is made of 5B71 welding wire, and the welding process is automatic MIG.
Comparative example 1
The other operations are completely identical to those of example 3; except that the temperature of the last hot forging is 320 ℃; the obtained alloy forging blank has the tensile strength of 337MPa, the yield strength of 187MPa and the elongation of 19.5 percent.
Comparative example 2
The other operations are completely identical to those of example 3; except that the temperature of the last hot forging is 260 ℃; the obtained alloy forging blank has tensile strength of 348MPa, yield strength of 206MPa and elongation of 20%.
Comparative example 3
The other operations are completely identical to those of example 3; the difference is that the temperature of the last hot forging is 320 ℃, and the middle extrusion process is omitted; the obtained alloy forging blank has the tensile strength of 362MPa, the yield strength of 232MPa and the elongation of 24 percent.
Claims (9)
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