CN116804261A - GH738 alloy bar and preparation method thereof - Google Patents
GH738 alloy bar and preparation method thereof Download PDFInfo
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- 229910045601 alloy Inorganic materials 0.000 title claims abstract description 78
- 239000000956 alloy Substances 0.000 title claims abstract description 78
- 238000002360 preparation method Methods 0.000 title claims abstract description 11
- 239000006104 solid solution Substances 0.000 claims abstract description 34
- 238000005242 forging Methods 0.000 claims abstract description 32
- 238000010622 cold drawing Methods 0.000 claims abstract description 31
- 238000005098 hot rolling Methods 0.000 claims abstract description 27
- 238000010438 heat treatment Methods 0.000 claims abstract description 17
- 230000002045 lasting effect Effects 0.000 claims abstract description 15
- 230000006698 induction Effects 0.000 claims abstract description 6
- 238000000034 method Methods 0.000 claims description 30
- 238000005096 rolling process Methods 0.000 claims description 28
- 238000001816 cooling Methods 0.000 claims description 26
- 238000004321 preservation Methods 0.000 claims description 22
- 239000000243 solution Substances 0.000 claims description 13
- 238000005498 polishing Methods 0.000 claims description 11
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 10
- 230000000087 stabilizing effect Effects 0.000 claims description 8
- 230000032683 aging Effects 0.000 claims description 7
- 230000006641 stabilisation Effects 0.000 claims description 7
- 238000011105 stabilization Methods 0.000 claims description 7
- 239000011248 coating agent Substances 0.000 claims description 5
- 238000000576 coating method Methods 0.000 claims description 5
- 239000002131 composite material Substances 0.000 claims description 5
- 229910052742 iron Inorganic materials 0.000 claims description 5
- 239000000314 lubricant Substances 0.000 claims description 5
- 238000005461 lubrication Methods 0.000 claims description 5
- 238000002844 melting Methods 0.000 claims description 5
- 230000008018 melting Effects 0.000 claims description 5
- 238000012360 testing method Methods 0.000 claims description 5
- 230000002688 persistence Effects 0.000 claims description 3
- 230000007547 defect Effects 0.000 abstract description 4
- 238000003723 Smelting Methods 0.000 abstract description 3
- 238000012545 processing Methods 0.000 abstract description 3
- 239000013078 crystal Substances 0.000 description 8
- 230000000052 comparative effect Effects 0.000 description 7
- 238000010586 diagram Methods 0.000 description 6
- 238000001514 detection method Methods 0.000 description 4
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- 238000011056 performance test Methods 0.000 description 4
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- 238000009792 diffusion process Methods 0.000 description 2
- 230000005923 long-lasting effect Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
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- 238000009864 tensile test Methods 0.000 description 2
- 238000000137 annealing Methods 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 150000001247 metal acetylides Chemical class 0.000 description 1
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- 238000007254 oxidation reaction Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 238000004881 precipitation hardening Methods 0.000 description 1
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- 239000002994 raw material Substances 0.000 description 1
- 238000005482 strain hardening Methods 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
- 229910000601 superalloy Inorganic materials 0.000 description 1
- 229910001247 waspaloy Inorganic materials 0.000 description 1
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Abstract
The application belongs to the technical field of alloy processing, and discloses a GH738 alloy bar and a preparation method thereof, wherein the preparation method comprises the steps of preparing a GH738 alloy forging piece through vacuum induction smelting, vacuum consumable remelting, homogenizing treatment and forging; hot rolling the forging piece to obtain a bar blank; solid solution softening is carried out on the rod blank; cold drawing is carried out on the rod blank after solid solution softening; and carrying out heat treatment on the cold drawn bar blank to obtain a finished bar. The GH738 alloy bar with the diameter not more than 25mm prepared by the application has the tensile strength more than 1300MPa and the yield strength more than 850MPa, and the high-temperature lasting time at 730 ℃/520MPa reaches 200-250h, so that the defect that the prior art cannot meet the requirements of high strength and long high-temperature lasting performance when the GH738 alloy bar with the diameter not more than 25mm is produced is successfully overcome.
Description
Technical Field
The application belongs to the technical field of alloy processing, and particularly relates to a GH738 alloy bar and a preparation method thereof.
Background
GH738 (American grade Waspaloy) is a Ni-Cr-Co base precipitation hardening refractory superalloy, and the main strengthening phases are gamma phase, MC and M23C6 carbide, so that aviation fasteners with high strength and high oxidation resistance below 815 ℃ can be manufactured.
For GH738 alloy bars with the diameter specification not more than 25mm, the tensile strength is required to be more than 1210MPa, the yield strength is required to be more than 795MPa, the high-temperature lasting time at 730 ℃ and 520MPa is required to be more than 23h, but for certain high-temperature fasteners used under special conditions, such as new generation aerospace vehicles and engines, the lasting life is required to be more than 100h on the premise of ensuring the strength of the GH738 alloy bars.
At present, the problem of unmatched strength and durability exists when preparing GH738 alloy bar with the diameter not more than 25mm, on one hand, in order to improve the alloy strength, crystal grains are required to be thinned in the rolling process, on the other hand, the durability of the GH738 alloy bar is improved along with the increase of the crystal grain size, and because the crystal boundary is a weak link in a high-temperature state, the crystal grain size is increased, the area of the crystal boundary is reduced, and thus the durability is improved, but the alloy strength is reduced. The prior art scheme can not meet the requirements of GH738 alloy bar with the diameter specification not more than 25mm on high strength and long-high-temperature durability.
The patent number CN113333491A provides a production method of GH738 alloy cold drawn bars, which comprises the steps of carrying out vacuum smelting on raw materials, carrying out homogenizing diffusion annealing on steel bars obtained by smelting, and controlling the homogenizing diffusion process to be more than or equal to 30 hours at 1190 ℃; carrying out cold drawing treatment on the treated steel bar by using a cold drawing machine, wherein the cold drawing deformation is controlled to be 11-12%, and the steel bar is subjected to heat treatment in the cold drawing process, and the treatment temperature is 1020-1040 ℃; the finished bar is subjected to heat treatment again, the temperature of the heat treatment of the finished bar is controlled at 1040-1060 ℃, the plasticity of the GH738 alloy is improved, and the structural uniformity is ensured, but the patent mainly solves the problem of the processing method of the GH738 alloy cold-drawn bar.
The patent number CN116000134A mainly solves the problem of providing a GH4738 alloy cold-drawn rod with fine grain structure, high room temperature strength and high surface quality, wherein the GH4738 alloy cold-drawn rod is prepared by adjusting the content of C, al and P in the alloy, optimizing the components of the GH4738 alloy, improving the cooperation process, controlling the thermal deformation and cold deformation in a coordinated manner, controlling the hot rolling temperature to 1080-1140 ℃, controlling the total deformation of hot rolling to 30-60% and the total deformation of cold drawing to 8-30%, and has room temperature tensile strength not less than 1400MPa,720 ℃/600MPa long-term life not less than 45h, and a preparation method and application thereof, but the high temperature durability of the alloy rod prepared by the GH4738 alloy cold-drawn rod is lower and not more than 60h.
Therefore, it is necessary to provide a high-strength GH738 alloy bar with long high-temperature duration time and a preparation method thereof.
Disclosure of Invention
In order to overcome the defects in the prior art, the application aims to provide a high-strength GH738 alloy bar with long high-temperature duration time and a preparation method thereof, and the high-temperature duration of the GH738 alloy bar is greatly improved on the premise of ensuring the strength of the bar when the GH738 alloy bar with the diameter not more than 25mm is prepared, so that the technical problems that the strength and the duration of the GH738 alloy bar in the preparation of the GH738 alloy bar with the diameter not more than 25mm are not matched and the requirements of the bar on the high-strength and the long high-temperature duration performance cannot be met in the prior art are solved.
In order to achieve the above purpose, the present application provides the following technical solutions:
a method for preparing a GH738 alloy bar, comprising:
preparing GH738 alloy forgings through vacuum induction melting, vacuum consumable remelting, homogenizing treatment and forging;
hot rolling the forging piece to obtain a bar blank;
solid solution softening is carried out on the rod blank;
cold drawing is carried out on the rod blank after solid solution softening, and the deformation of the cold drawing subtracting face is controlled to be 8% -10%;
carrying out heat treatment on the cold drawn bar blank to obtain a finished bar;
the diameter of the bar is not more than 25mm, the tensile strength is more than 1300MPa, the yield strength is more than 850MPa, and the high-temperature lasting time at 730 ℃/520MPa is 200-250h;
wherein, hot rolling forging includes:
and (3) treating the forging by adopting a final hot process of the hot rolling process, wherein the final hot rolling temperature is 1130-1150 ℃, the total deformation of final hot rolling is controlled to be 70-80%, and the final hot rolling temperature is more than or equal to 1000 ℃.
In some embodiments of the application, the grain size of the control rod blank is in the order of 7-8.
In some embodiments of the application, prior to hot rolling the forging, comprising:
the surface temperature of the roller is raised to be more than 200 ℃ by rolling test rolled iron.
In some embodiments of the application, solid solution softening a bar blank comprises:
the solid solution softening temperature is controlled at 1030+/-10 ℃, and the air cooling is carried out after the solid solution softening.
In some embodiments of the present application, prior to cold drawing the solid solution softened bar stock, the method comprises:
and (3) carrying out surface polishing treatment on the solid-solution softened bar blank, and then coating an aqueous composite lubricant on the surface of the bar blank for lubrication and cold drawing.
In some embodiments of the present application, heat treating the cold drawn bar stock comprises:
carrying out solid solution treatment on the cold drawn rod blank, and carrying out air cooling after heat preservation for 1h at 1020 ℃;
stabilizing the rod blank after solution treatment, and air-cooling after heat preservation for 4 hours at 843 ℃;
aging the rod blank after the stabilization treatment, and air-cooling after heat preservation for 16h at 760 ℃.
In some embodiments of the application, prior to heat treating the cold drawn bar stock, the method comprises:
and carrying out surface polishing straightening mechanical treatment on the cold drawn rod blank.
On the other hand, the application discloses a GH738 alloy bar which is prepared by adopting the method.
In some embodiments of the application, the bar has a diameter no greater than 25mm, a tensile strength greater than 1300MPa, a yield strength greater than 850MPa, and a high temperature persistence time at 730 ℃/520MPa of 200-250h.
The application has the technical effects and advantages that:
1. the GH738 alloy bar with the diameter not more than 25mm prepared by the application has the tensile strength more than 1300MPa and the yield strength more than 850MPa, and the high-temperature lasting time at 730 ℃/520MPa reaches 200-250h, so that the defect that the prior art cannot meet the requirements of high strength and long high-temperature lasting performance when the GH738 alloy bar with the diameter not more than 25mm is produced is successfully overcome.
2. According to the application, the rolling temperature, the final rolling temperature and the deformation of the hot rolling are precisely controlled to obtain the bars with the grain size of 7-8 grades, and meanwhile, measures are taken to raise the surface temperature of the roller before rolling, so that the surface mixed crystals caused by the large surface temperature drop of the bar blank in the rolling process are avoided.
3. The application controls the cold drawing deformation in the cold drawing process, and improves the strength of the alloy rod blank through work hardening on the premise of not changing the grain structure of the rod blank.
4. The application avoids the bar from generating cracks through polishing and straightening treatment after cold drawing.
5. The application makes the uniform and fine carbide be discontinuously distributed at the grain boundary by carrying out heat treatment on the cold drawn bar blank, so that the strength and high-temperature durability of the bar are greatly improved.
Additional features and advantages of the application will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the application. The objectives and other advantages of the application may be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.
Drawings
FIG. 1 is a flow chart of a method for preparing a high-strength GH738 alloy bar with long high-temperature duration time;
FIG. 2 is a diagram of the structure of the finished grain of example 1;
FIG. 3 is a plot of the finished carbide distribution of example 1;
FIG. 4 is a diagram of the structure of the finished grain of example 2;
fig. 5 is a plot of the finished carbide distribution of example 2.
Detailed Description
The following description of the embodiments of the present application will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present application, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
As shown in fig. 1, the application provides a preparation method of a high-strength GH738 alloy bar with long high-temperature duration, which comprises the following steps:
preparing GH738 alloy forgings through vacuum induction melting, vacuum consumable remelting, homogenizing treatment and forging;
hot rolling the forging piece to obtain a bar blank;
solid solution softening is carried out on the rod blank;
cold drawing is carried out on the rod blank after solid solution softening, and the deformation of the cold drawing subtracting face is controlled to be 8% -10%;
carrying out heat treatment on the cold drawn bar blank to obtain a finished bar;
the diameter of the bar is not more than 25mm, the tensile strength is more than 1300MPa, the yield strength is more than 850MPa, and the high-temperature lasting time at 730 ℃/520MPa is 200-250h;
wherein, hot rolling forging includes:
and (3) treating the forging by adopting a final hot process of the hot rolling process, wherein the final hot rolling temperature is 1130-1150 ℃, the total deformation of final hot rolling is controlled to be 70-80%, and the final hot rolling temperature is more than or equal to 1000 ℃.
Deformation amount= (S) of the alloy of the present application 0 -S)/S 0 Wherein is S 0 The cross-sectional area of the bar before deformation is S, and the cross-sectional area of the bar after deformation is S.
It should be noted that the deformation resistance of different high temperature alloys is different, and the high temperature alloys are extremely sensitive to the hot working temperature, so that different hot working temperatures cannot be suitable for different high temperature alloys.
In some embodiments of the application, the grain size of the control rod blank is in the order of 7-8.
In some embodiments of the application, prior to hot rolling the forging, comprising:
the surface temperature of the roller is raised to be more than 200 ℃ by rolling test rolled iron, so that mixed crystals on the surface layer caused by large temperature drop of the surface layer of the forging piece in the rolling process are avoided.
In some embodiments of the application, solid solution softening a bar blank comprises:
the solid solution softening temperature is controlled at 1030+/-10 ℃, air cooling is carried out after solid solution softening, the temperature is controlled at not more than 1040 ℃, the solid solution treatment requirement of GH738 alloy is met, and meanwhile, the growth of grains can be prevented.
In some embodiments of the present application, prior to cold drawing the solid solution softened bar stock, the method comprises:
and (3) carrying out surface polishing treatment on the solid-solution softened bar blank, and then coating an aqueous composite lubricant on the surface of the bar blank for lubrication.
In some embodiments of the present application, heat treating the cold drawn bar stock comprises:
carrying out solid solution treatment on the cold drawn rod blank, and carrying out air cooling after heat preservation for 1h at 1020 ℃;
stabilizing the rod blank after solution treatment, and air-cooling after heat preservation for 4 hours at 843 ℃;
aging the rod blank after the stabilization treatment, and air-cooling after heat preservation for 16h at 760 ℃.
The bar blank after cold drawing is subjected to heat treatment, so that uniform and fine carbides are intermittently distributed at the grain boundary, and the strength and high-temperature durability of the bar are greatly improved.
In some embodiments of the application, prior to heat treating the cold drawn bar stock, the method comprises:
and carrying out surface polishing straightening mechanical treatment on the cold drawn bar blank to avoid cracking of the bar.
On the other hand, the application provides a GH738 alloy bar which is prepared by adopting the method.
In some embodiments of the application, the bar has a diameter no greater than 25mm, a tensile strength greater than 1300MPa, a yield strength greater than 850MPa, and a high temperature persistence time at 730 ℃/520MPa of 200-250h.
In order to better illustrate the present scheme, the following examples and comparative examples are also provided.
Example 1
This example produced a 12mm diameter high strength long high temperature long lasting GH738 alloy bar.
S1: GH738 alloy forge pieces are prepared through vacuum induction melting, vacuum consumable remelting, homogenizing treatment and forging, wherein the homogenizing treatment comprises air cooling after heat preservation at 1160 ℃ for 24 hours, then air cooling after heat preservation at 1190 ℃ for more than or equal to 60 hours, the forging treatment comprises heating GH738 alloy to 1150 ℃, forging by adopting a three-upsetting three-drawing process, and the final forging temperature is more than or equal to 1000 ℃.
S2: the surface temperature of a roller is raised to be more than 200 ℃ by rolling test rolling iron, then a hot rolling final fire process is adopted to treat the forging, the final fire rolling temperature is 1130 ℃, the final fire rolling total deformation is controlled to be 72%, the final fire final rolling temperature is 1011 ℃, the rolling specification diameter is 13.50mm, and the grain size of the obtained bar blank is 7.5 grade.
S3: and (3) carrying out solid solution softening on the rod blank, controlling the solid solution softening temperature to 1030 ℃, preserving the heat for 1 hour, and carrying out air cooling after the solid solution softening.
S4: and (3) carrying out surface polishing treatment on the rod blank after solid solution softening until the diameter is 12.90mm, then uniformly coating an aqueous composite lubricant on the surface of the rod blank for lubrication, and carrying out cold drawing, wherein the deformation of a cold drawing reduced surface is controlled to be 9%, and the size after cold drawing is 12.31mm.
S5: the surface of the bar blank with the diameter of 12.31mm after cold drawing is mechanically treated to the diameter of 12.00mm through polishing and straightening.
S6: the cold drawn rod blank is subjected to solution treatment by adopting the following heat treatment process: air cooling after heat preservation for 1h at 1020 ℃; stabilizing the rod blank after the solution treatment: air cooling after heat preservation for 4 hours at 843 ℃; aging the rod blank after the stabilization treatment: and (5) preserving heat at 760 ℃ for 16 hours, and then performing air cooling to obtain a finished product.
The grain structure diagram of the finished product is shown in figure 2, the grain size is 8 grade, the carbide distribution diagram is shown in figure 3, the carbide is intermittently distributed along the grain boundary in the form of particles, and a small part of carbide is dispersed in the crystal.
And (3) carrying out a tensile test on the finished product at room temperature, detecting the high-temperature durability of the finished product at 730 ℃/520MPa, wherein the detection result is shown in table 1, the tensile strength of the finished product with the diameter of 12mm is 1323MPa, the yield strength is 887MPa, and the high-temperature durability time at 730 ℃/520MPa is 244h.
TABLE 1 results of Performance test on 12mm diameter finished products
Example 2
This example produced a 22mm diameter high strength long high temperature long lasting GH738 alloy bar.
S1: GH738 alloy forge pieces are prepared through vacuum induction melting, vacuum consumable remelting, homogenizing treatment and forging, wherein the homogenizing treatment comprises air cooling after heat preservation at 1160 ℃ for 24 hours, then air cooling after heat preservation at 1190 ℃ for more than or equal to 60 hours, the forging treatment comprises heating GH738 alloy to 1150 ℃, forging by adopting a three-upsetting three-drawing process, and the final forging temperature is more than or equal to 1000 ℃.
S2: the surface temperature of a roller is raised to be more than 200 ℃ by rolling test rolling iron, then a hot rolling final heat process is adopted to treat a forging piece, the final heat rolling temperature is 1140 ℃, the total deformation of final heat rolling is controlled to be 75%, the final heat final rolling temperature is 1000 ℃, the rolling specification diameter is 25.00mm, and the grain size of the obtained bar blank is 8-grade.
S3: and (3) carrying out solid solution softening on the rod blank, controlling the solid solution softening temperature to 1030 ℃, preserving the heat for 1 hour, and carrying out air cooling after the solid solution softening.
S4: and (3) carrying out surface polishing treatment on the solid-solution softened bar blank until the diameter reaches 23.55mm, then uniformly coating an aqueous composite lubricant on the surface of the bar blank for lubrication, and carrying out cold drawing, wherein the deformation of a cold drawing reduced surface is controlled to be 10%, and the size after cold drawing is 22.34mm.
S5: the surface of the bar blank with the diameter of 22.34mm after cold drawing is mechanically treated to the diameter of 22.00mm through polishing and straightening.
S6: the cold drawn rod blank is subjected to solution treatment by adopting the following heat treatment process: air cooling after heat preservation for 1h at 1020 ℃; stabilizing the rod blank after the solution treatment: air cooling after heat preservation for 4 hours at 843 ℃; aging the rod blank after the stabilization treatment: and (5) preserving heat at 760 ℃ for 16 hours, and then performing air cooling to obtain a finished product.
The grain structure diagram of the finished product is shown in fig. 4, the grain size is 8 grade, the carbide distribution diagram is shown in fig. 5, the carbide is intermittently distributed along the grain boundary in the form of grains, and a small part of carbide is dispersed in the grain.
And (3) carrying out a tensile test on the finished product at room temperature, detecting the high-temperature durability of the finished product at 730 ℃/520MPa, wherein the detection result is shown in table 2, the tensile strength of the finished product with the diameter of 22mm is 1351MPa, the yield strength is 910MPa, and the high-temperature durability time at 730 ℃/520MPa is 232h.
TABLE 2 results of Performance test on 22mm diameter finished product
Comparative example 1
GH738 alloy bars with the diameter of 12mm are prepared in the comparative example, the heating temperature is 1130-1160 ℃ during hot rolling, the initial rolling temperature is more than or equal to 1080 ℃, the final rolling temperature is more than or equal to 950 ℃, the deformation is more than or equal to 85%, and the obtained bars have the grain size of 10 grades and are not subjected to cold drawing. Standard heat treatment by GH738 alloy: the GH738 alloy after solution treatment is subjected to heat preservation at 1020 ℃ for 1h and then air-cooled, the GH738 alloy after solution treatment is subjected to stabilization treatment, heat preservation at 843 ℃ for 4h and air-cooled, the GH738 alloy after stabilization treatment is subjected to aging treatment and heat preservation at 760 ℃ for 16h and then air-cooled, and the performance detection result of the obtained 12mm GH738 alloy bar is shown in Table 3, the tensile strength at room temperature is 1426MPa, the yield strength is 910MPa, but the high-temperature lasting time at 730 ℃/520MPa is 94h and the high-temperature lasting time is far smaller than that of the embodiment.
TABLE 3 comparative example 1 Performance test results
Comparative example 2
The GH738 alloy bar with the diameter of 22mm is prepared in the comparative example, the heating temperature is 1130-1160 ℃ during hot rolling, the initial rolling temperature is more than or equal to 1080 ℃, the final rolling temperature is more than or equal to 950 ℃, the deformation is more than or equal to 85%, and the grain size of the obtained bar is 9.5 grade without cold drawing. Standard heat treatment by GH738 alloy: the GH738 alloy is subjected to solution treatment, heat preservation is carried out for 1h, air cooling is carried out, stabilizing treatment is carried out on the GH738 alloy after the solution treatment, heat preservation is carried out for 4h at 843 ℃, then air cooling is carried out on the GH738 alloy after the stabilizing treatment, aging treatment is carried out on the GH738 alloy after the stabilizing treatment, heat preservation is carried out for 16h at 760 ℃, the performance detection result of the obtained 22mm GH738 alloy bar is shown in Table 4, the tensile strength at room temperature is 1307MPa, the yield strength is 850MPa, but the high-temperature lasting time at 730 ℃/520MPa is 105h, and the high-temperature lasting time is far smaller than that of the embodiment.
Table 4 comparative example 2 performance test results
In conclusion, according to comparison, through improving hot rolling process parameters, the application prepares a rod blank with the grain size of 7-8 grade alloy, then performs proper cold drawing processing to harden the rod blank on the premise of not changing the grain structure of the rod blank, and the prepared GH738 alloy bar with the diameter not more than 25mm has the tensile strength more than 1300MPa, the yield strength more than 850MPa and the high-temperature lasting time at 730 ℃/520MPa reaching 200-250h, thereby successfully solving the defect that the prior art cannot meet the requirements of high strength and long-temperature lasting performance when producing the GH738 alloy bar with the diameter not more than 25 mm.
Finally, it should be noted that: the foregoing description is only illustrative of the preferred embodiments of the present application, and although the present application has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments described, or equivalents may be substituted for elements thereof, and any modifications, equivalents, improvements or changes may be made without departing from the spirit and principles of the present application.
Claims (9)
1. A method for preparing a GH738 alloy bar, which is characterized by comprising the following steps:
preparing GH738 alloy forgings through vacuum induction melting, vacuum consumable remelting, homogenizing treatment and forging;
hot rolling the forging piece to obtain a bar blank;
solid solution softening is carried out on the rod blank;
cold drawing is carried out on the rod blank after solid solution softening, and the deformation of the cold drawing subtracting face is controlled to be 8% -10%;
carrying out heat treatment on the cold drawn bar blank to obtain a finished bar;
the diameter of the bar is not more than 25mm, the tensile strength is more than 1300MPa, the yield strength is more than 850MPa, and the high-temperature lasting time at 730 ℃/520MPa is 200-250h;
wherein hot rolling the forging comprises:
and (3) treating the forging by adopting a final fire process of a hot rolling process, wherein the final fire rolling temperature is 1130-1150 ℃, the total deformation of final fire rolling is controlled to be 70-80%, and the final fire final rolling temperature is more than or equal to 1000 ℃.
2. The preparation method of the GH738 alloy bar as claimed in claim 1, wherein,
controlling the grain size of the rod blank to be 7-8 grade.
3. The method for preparing a GH738 alloy bar according to claim 1, wherein before hot rolling the forging, the method comprises:
the surface temperature of the roller is raised to be more than 200 ℃ by rolling test rolled iron.
4. A method of producing a GH738 alloy bar according to any one of claims 1-3, wherein said solid solution softening of said bar comprises:
the solid solution softening temperature is controlled at 1030+/-10 ℃, and the air cooling is carried out after the solid solution softening.
5. The method for preparing a GH738 alloy bar according to claim 1, wherein before cold drawing the solid solution softened bar blank, the method comprises:
and (3) carrying out surface polishing treatment on the solid-solution softened bar blank, and then coating an aqueous composite lubricant on the surface of the bar blank for lubrication.
6. The method for preparing a GH738 alloy bar according to claim 1, wherein said heat treating the cold drawn bar blank comprises:
carrying out solution treatment on the cold drawn rod blank, and carrying out air cooling after heat preservation for 1h at 1020 ℃;
stabilizing the rod blank subjected to solution treatment, preserving the temperature at 843 ℃ for 4 hours, and then performing air cooling;
and (3) aging the rod blank after the stabilization treatment, and carrying out air cooling after heat preservation for 16h at 760 ℃.
7. The method for preparing a GH738 alloy bar according to claim 6, wherein before said heat treating the cold drawn bar blank, the method comprises:
and carrying out surface polishing straightening mechanical treatment on the cold drawn rod blank.
8. A GH738 alloy bar, wherein the bar is prepared by the method of any one of claims 1-7.
9. The GH738 alloy bar of claim 8, wherein the bar has a diameter of no greater than 25mm, a tensile strength of greater than 1300MPa, a yield strength of greater than 850MPa, and a high temperature persistence time of 200-250h at 730 ℃/520 MPa.
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