CN116005087A - Heat treatment method of GH4169 alloy forging - Google Patents
Heat treatment method of GH4169 alloy forging Download PDFInfo
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- CN116005087A CN116005087A CN202211581715.1A CN202211581715A CN116005087A CN 116005087 A CN116005087 A CN 116005087A CN 202211581715 A CN202211581715 A CN 202211581715A CN 116005087 A CN116005087 A CN 116005087A
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- 238000005242 forging Methods 0.000 title claims abstract description 98
- 238000010438 heat treatment Methods 0.000 title claims abstract description 54
- 229910045601 alloy Inorganic materials 0.000 title claims abstract description 43
- 239000000956 alloy Substances 0.000 title claims abstract description 43
- 238000000034 method Methods 0.000 title claims abstract description 24
- 238000001816 cooling Methods 0.000 claims abstract description 34
- 239000006104 solid solution Substances 0.000 claims abstract description 13
- 230000032683 aging Effects 0.000 claims description 22
- 238000002791 soaking Methods 0.000 claims description 7
- 238000004321 preservation Methods 0.000 claims description 6
- 239000002356 single layer Substances 0.000 claims description 3
- 230000002411 adverse Effects 0.000 abstract description 3
- 238000009776 industrial production Methods 0.000 abstract description 2
- 230000000694 effects Effects 0.000 abstract 3
- 238000007599 discharging Methods 0.000 abstract 2
- 101000912561 Bos taurus Fibrinogen gamma-B chain Proteins 0.000 description 3
- 239000010410 layer Substances 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 238000001556 precipitation Methods 0.000 description 3
- 229910000601 superalloy Inorganic materials 0.000 description 3
- 239000006185 dispersion Substances 0.000 description 2
- 230000007774 longterm Effects 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 238000005728 strengthening Methods 0.000 description 2
- 230000002929 anti-fatigue Effects 0.000 description 1
- 230000003064 anti-oxidating effect Effects 0.000 description 1
- 230000003471 anti-radiation Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- BIJOYKCOMBZXAE-UHFFFAOYSA-N chromium iron nickel Chemical compound [Cr].[Fe].[Ni] BIJOYKCOMBZXAE-UHFFFAOYSA-N 0.000 description 1
- RKTYLMNFRDHKIL-UHFFFAOYSA-N copper;5,10,15,20-tetraphenylporphyrin-22,24-diide Chemical compound [Cu+2].C1=CC(C(=C2C=CC([N-]2)=C(C=2C=CC=CC=2)C=2C=CC(N=2)=C(C=2C=CC=CC=2)C2=CC=C3[N-]2)C=2C=CC=CC=2)=NC1=C3C1=CC=CC=C1 RKTYLMNFRDHKIL-UHFFFAOYSA-N 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 238000004090 dissolution Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000001953 recrystallisation Methods 0.000 description 1
- 238000010079 rubber tapping Methods 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 230000035882 stress Effects 0.000 description 1
- 230000006032 tissue transformation Effects 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
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Abstract
The invention provides a heat treatment method for improving yield strength of GH4169 alloy forgings, which comprises the following steps: firstly, heating a GH4169 alloy forging to 720 ℃, preserving heat for 8 hours, cooling to 620 ℃ at a speed of 50 ℃/h, preserving heat for 8 hours, discharging, and then cooling the forging in air; heating the GH4169 alloy forging cooled to room temperature in the first step to 975 ℃, preserving heat for 1h, and dispersing and air cooling; and thirdly, heating the GH4169 alloy forge piece cooled to room temperature in the second step to 720 ℃, preserving heat for 8 hours, cooling to 620 ℃ in a furnace at 50 ℃/h, preserving heat for 8 hours, discharging, and then carrying out air cooling on the forge piece. The adverse effect of solid solution effect on the strength of the forging piece is weakened on the premise of eliminating the adverse effect of the unstable structure of the forging state on the strength of the forging piece, and the strength of the forging piece is comprehensively improved. And the strength, plasticity and durability meeting the standard requirements are obtained, the process is simple and stable, the operation is convenient, and the method is suitable for industrial production.
Description
Technical Field
The invention belongs to the field of metal heat treatment, and particularly relates to a heat treatment method of GH4169 alloy forgings.
Background
The GH4169 superalloy is a nickel-chromium-iron-based superalloy which is reinforced by ordered body-centered tetragonal gamma 'phase and face-centered cubic gamma' -phase precipitation, is used below 700 ℃, has yield strength below 650 ℃ at the first place of deformation superalloy, has good anti-fatigue, anti-radiation, anti-oxidation and corrosion resistance properties, good processability, welding performance and long-term tissue stability, can be used for manufacturing various parts with complex shapes, and can be widely applied in aerospace, nuclear energy and petroleum industries in the temperature range.
At present, the GH4169 forge piece in a standard solid solution and aging state has the performance requirement that the tensile strength is more than or equal to 1345MPa, the yield strength is more than or equal to 1100MPa, the elongation requirement is more than or equal to 12 percent, and the area reduction requirement is more than or equal to 15 percent. In the daily forging process, the problems of low final forging temperature, large delta phase quantity and the like caused by the problems of non-ideal and non-uniform forging structure and forging process of the forging structure influence result in unqualified tensile strength and unqualified yield strength of the forging, and influence on production progress and delivery.
Disclosure of Invention
The invention aims to: the heat treatment method for the GH4169 alloy forging is provided, so that the durability, the plasticity and the creep property of the forging can meet the specification requirements under the condition of higher strength allowance.
The technical scheme is as follows:
a method of heat treating a GH4169 alloy forging comprising:
step one, aging: heating the forged GH4169 alloy forging to 600 ℃ and preserving heat for 30-90 min, then heating to 700 ℃ and preserving heat for 30-90 min, then heating to 720 ℃, preserving heat for 8h, cooling to 620 ℃ at a speed of 50 ℃/h, preserving heat for 8-24 h, and air cooling;
step two, solid solution: heating the GH4169 alloy forge piece cooled to room temperature in the first step to 825 ℃, preserving heat for 60-120 min, then heating to a preset temperature, soaking for 30-60 min, preserving heat for 1h, and dispersing for air cooling; the preset temperature is determined according to the strength requirement of the rigid forging; the higher the strength requirement is, the higher the preset temperature is;
step three, aging: and (3) heating the GH4169 alloy forge piece cooled to room temperature in the second step to 600 ℃ and preserving heat for 30-90 min, then heating to 700 ℃ and preserving heat for 30-90 min, then heating to 720 ℃, preserving heat for 8h, cooling to 620 ℃ at a speed of 50 ℃/h, preserving heat for 8-24 h, and air cooling.
Further, in the first step and the third step, the temperature of the aging forging is not higher than 500 ℃; in the second step, the furnace charging temperature of the solid solution forging is not higher than 800 ℃.
Further, in the first to third steps, the disc and shaft forgings are placed in a single layer, the number of layers of annular forgings is less than or equal to 3, and the interval between the forgings is more than or equal to 100mm.
Further, in the second step, air cooling is performed in a dispersing manner, specifically: dispersing the forgings on a cooling frame, wherein the dispersing interval is more than or equal to 200mm, and the transfer time is less than or equal to 120 seconds.
Further, in the first step and the third step, the heat preservation time of aging 620 ℃ is proportional to the strength of the forging.
Further, in the first and third steps, the holding time of aging 620 ℃ is inversely proportional to the final forging temperature of the forging.
Further, soaking time of the GH4169 alloy forging in the second step=effective thickness of the forging; the heat preservation coefficient is 0.3min/mm to 0.8min/mm.
Further, the preset temperature is 975 ℃.
The heat treatment method of the GH4169 alloy forging provided by the invention has the following advantages:
(1) The aging furnace charging temperature of the GH4169 alloy forging is required to be not higher than 500 ℃, the solid solution furnace charging temperature is required to be not higher than 800 ℃, the internal stress of the forging caused by the heating process is reduced, and the uniform structure and the flat appearance of the forging are ensured.
(2) The invention adds an aging process before conventional solid solution and aging heat treatment. During the aging process, the alloy elements are redistributed, so that gamma 'phases are fully separated out, part of gamma' phases in the alloy are converted into gamma ', and the gamma' phases are dispersed and distributed in the alloy to form a stable structure, which is completely different from an unstable dynamic recrystallization structure after forging. The forging is beneficial to stabilizing the forging structure after being added with aging, the stable structure can obviously improve the forging strength, and the mode greatly reduces adverse factors to the structure in the forging process, and the forging strength is greatly improved after standard solid solution and aging, but the elongation rate is not greatly changed.
In summary, the invention considers the influence of different heat treatment modes on the forging structure performance, and more particularly describes the heat treatment process parameters of the GH4169 alloy forging, the grain size of the GH4169 alloy forging can be controlled to be 8-10 grade by controlling the forging structure transformation and phase precipitation, the grain boundary has the structure form of delta phase dispersion distribution, and all the performance parameters required by the specification can be met. Stable process, convenient operation and suitability for industrial production.
Drawings
FIG. 1 is a schematic view of the microstructure of a GH4169 alloy forging after heat treatment, 100 μm showing magnification at 100 times;
FIG. 2 is a schematic drawing of the microstructure of a GH4169 alloy forging after heat treatment, 20 μm showing a magnification of 500 times.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention more clear, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. It will be apparent that the described embodiments are some, but not all, embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without making any inventive effort are intended to fall within the scope of the present invention.
The invention provides a heat treatment method of GH4169 alloy forgings, which comprises the following steps:
step one, aging
Heating the forged GH4169 alloy forging to 600 ℃ and preserving heat for 30-90 min, then heating to 700 ℃ and preserving heat for 30-90 min, then heating to 720 ℃, preserving heat for 8h, cooling to 620 ℃ at a speed of 50 ℃/h, preserving heat for 8-24 h, and air cooling;
step two, solid solution
Heating the GH4169 alloy forge piece cooled to room temperature in the first step to 825 ℃, preserving heat for 60-120 min, then heating to a preset temperature, soaking for 30-60 min, preserving heat for 1h, and dispersing for air cooling; the preset temperature is determined according to the strength requirement of the rigid forging; the higher the strength requirement is, the higher the preset temperature is;
step three, aging
Heating the forged GH4169 alloy forging to 600 ℃ and preserving heat for 30-90 min, then heating to 700 ℃ and preserving heat for 30-90 min, then heating to 720 ℃, preserving heat for 8h, cooling to 620 ℃ at a speed of 50 ℃/h, preserving heat for 8-24 h, and air cooling.
Optionally, the temperature of the aging forging is not higher than 500 ℃, the temperature of the solid solution forging is not higher than 800 ℃, the condition that the forging is heated for a sufficient time is satisfied, and the uniformity of the surface and core tissues is promoted.
Optionally, the disc and shaft forgings are placed in a single layer, the placement layer number of the annular forgings is less than or equal to 3 layers, the interval between the forgings is more than or equal to 100mm, and the forgings are promoted to be uniform in the heating process.
Optionally, the GH4169 alloy heat treatment method according to claim 1, wherein the solid solution tapping cooling of the forging is dispersed on a cooling rack, the dispersion distance is more than or equal to 200mm, the transfer time is less than or equal to 120 seconds, and the uniform cooling of the forging is promoted to obtain uniform forging.
Optionally, the heat preservation time of 620 ℃ in the third aging step can be prolonged according to the strength requirement of the forging. The forging is insulated at 620 ℃, gamma' phase is mainly separated out, and a small amount of strengthening phase can be supplemented and separated out by prolonging the heat insulation time at 620 ℃. The data show that the tensile strength and the yield strength of the disc are improved by about 50MPa after long-term aging for 200 hours at 650 ℃, and the disc is the reason that gamma phase and gamma' are sequentially separated out and supplemented for strengthening.
Optionally, according to the condition of the final forging temperature, the forging with low final forging temperature can prolong the heat preservation time of 620 ℃ in the first step. And the gamma' phase is supplemented and separated out, so that the strength of the forging piece is further improved.
Optionally, soaking time of the GH4169 alloy forging in the second step=effective thickness of the forging; the heat preservation coefficient is 0.3min/mm to 0.8min/mm. The heat penetration time is increased, so that the tissue transformation of the forging from the surface to the core is satisfied, the enough time is provided, and the difference of the core on the surface of the forging is reduced.
Alternatively, the preset temperature is 975 ℃. The influence of the solid solution temperature on the dissolution and precipitation of the delta phase is fully considered, so that the satisfactory form and quantity of the delta phase are obtained, and the strength of the forging is comprehensively improved.
The present invention will be described in further detail with reference to practical production examples. The external dimensions are adopted: a GH4169 alloy forging of Φ390×278, having an effective thickness of 41mm. Firstly, heating a forged GH4169 alloy forging to 600 ℃ and preserving heat for 60min, then heating to 700 ℃ and preserving heat for 60min, then heating to 720 ℃, preserving heat for 8h, cooling to 620 ℃ with a furnace at 50 ℃/h, preserving heat for 8h, and air cooling; heating to 825 ℃, preserving heat for 60min, heating to a preset temperature, soaking for 30min, preserving heat for 1h, dispersing and cooling for 120s, transferring to a cooling frame, and dispersing and cooling at an interval of more than or equal to 200mm; and thirdly, heating the forge piece to 600 ℃ and preserving heat for 60min, then heating to 700 ℃ and preserving heat for 60min, then heating to 720 ℃, preserving heat for 8h, cooling to 620 ℃ at a speed of 50 ℃/h, preserving heat for 8h, and air cooling.
The mechanical performance parameters of GH4169 alloy forgings are shown in table 1, and the microstructure is shown in figures 1 and 2, wherein 100 mu m represents that the magnification is 100 times, and 20 mu m represents that the magnification is 500 times.
TABLE 1
Claims (8)
1. A method of heat treating a GH4169 alloy forging, comprising:
step one, aging: heating the forged GH4169 alloy forging to 600 ℃ and preserving heat for 30-90 min, then heating to 700 ℃ and preserving heat for 30-90 min, then heating to 720 ℃, preserving heat for 8h, cooling to 620 ℃ at a speed of 50 ℃/h, preserving heat for 8-24 h, and air cooling;
step two, solid solution: heating the GH4169 alloy forge piece cooled to room temperature in the first step to 825 ℃, preserving heat for 60-120 min, then heating to a preset temperature, soaking for 30-60 min, preserving heat for 1h, and dispersing for air cooling; the preset temperature is determined according to the strength requirement of the rigid forging; the higher the strength requirement is, the higher the preset temperature is;
step three, aging: and (3) heating the GH4169 alloy forge piece cooled to room temperature in the second step to 600 ℃ and preserving heat for 30-90 min, then heating to 700 ℃ and preserving heat for 30-90 min, then heating to 720 ℃, preserving heat for 8h, cooling to 620 ℃ at a speed of 50 ℃/h, preserving heat for 8-24 h, and air cooling.
2. The method of heat treating a GH4169 alloy forging according to claim 1, wherein in step one and step three, the aging forging is charged to a furnace temperature of not higher than 500 ℃; in the second step, the furnace charging temperature of the solid solution forging is not higher than 800 ℃.
3. The heat treatment method of GH4169 alloy forgings according to claim 1, wherein in the first to third steps, the disc and shaft forgings are placed in a single layer, the number of annular forgings is less than or equal to 3, and the forging spacing is greater than or equal to 100mm.
4. The heat treatment method of the GH4169 alloy forging according to claim 1, wherein in the second step, air cooling is dispersed, specifically: dispersing the forgings on a cooling frame, wherein the dispersing interval is more than or equal to 200mm, and the transfer time is less than or equal to 120 seconds.
5. The method of heat treating a GH4169 alloy forging according to claim 1, wherein in step one and step three, the holding time at aging 620 ℃ is proportional to the forging strength.
6. The method of heat treating a GH4169 alloy forging according to claim 1, wherein in step one and step three, the hold time at aging 620 ℃ is inversely proportional to the final forging temperature of the forging.
7. The heat treatment method of a GH4169 alloy forging according to claim 1, wherein the soaking time of the GH4169 alloy forging in the second step = effective thickness of the forging; the heat preservation coefficient is 0.3min/mm to 0.8min/mm.
8. The method of heat treating a GH4169 alloy forging according to claim 1, wherein the predetermined temperature is 975 ℃.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5906692A (en) * | 1993-12-28 | 1999-05-25 | Alliedsignal Inc. | Process for producing forged α-2 based titanium aluminides having fine grained and orthorhombic transformed microstructure and articles made therefrom |
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| CN114231866A (en) * | 2021-10-25 | 2022-03-25 | 陕西宏远航空锻造有限责任公司 | Heat treatment method for GH99 alloy annular forging |
| US20220119931A1 (en) * | 2020-03-02 | 2022-04-21 | Gaona Aero Material Co., Ltd. | Preparation method of nickel-based wrought superalloy wheel disk forgings used at high temperature |
-
2022
- 2022-12-09 CN CN202211581715.1A patent/CN116005087A/en active Pending
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5906692A (en) * | 1993-12-28 | 1999-05-25 | Alliedsignal Inc. | Process for producing forged α-2 based titanium aluminides having fine grained and orthorhombic transformed microstructure and articles made therefrom |
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| US20220119931A1 (en) * | 2020-03-02 | 2022-04-21 | Gaona Aero Material Co., Ltd. | Preparation method of nickel-based wrought superalloy wheel disk forgings used at high temperature |
| CN111270178A (en) * | 2020-03-11 | 2020-06-12 | 北京钢研高纳科技股份有限公司 | High-efficiency energy-saving heat treatment process for GH4169 alloy |
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