CN117448715A - N09925 nickel-based alloy bar and heat treatment method thereof - Google Patents
N09925 nickel-based alloy bar and heat treatment method thereof Download PDFInfo
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- CN117448715A CN117448715A CN202311322231.XA CN202311322231A CN117448715A CN 117448715 A CN117448715 A CN 117448715A CN 202311322231 A CN202311322231 A CN 202311322231A CN 117448715 A CN117448715 A CN 117448715A
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- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 title claims abstract description 192
- 229910045601 alloy Inorganic materials 0.000 title claims abstract description 116
- 239000000956 alloy Substances 0.000 title claims abstract description 116
- 229910052759 nickel Inorganic materials 0.000 title claims abstract description 99
- 238000010438 heat treatment Methods 0.000 title claims abstract description 98
- 238000000034 method Methods 0.000 title claims abstract description 37
- 238000001816 cooling Methods 0.000 claims abstract description 74
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 51
- 239000006104 solid solution Substances 0.000 claims abstract description 21
- 230000032683 aging Effects 0.000 claims description 30
- 239000002994 raw material Substances 0.000 claims description 18
- 238000002844 melting Methods 0.000 claims description 12
- 230000008018 melting Effects 0.000 claims description 12
- 239000000243 solution Substances 0.000 claims description 12
- 238000007670 refining Methods 0.000 claims description 11
- 238000002360 preparation method Methods 0.000 claims description 10
- 229910052782 aluminium Inorganic materials 0.000 claims description 7
- 229910052750 molybdenum Inorganic materials 0.000 claims description 7
- 229910052719 titanium Inorganic materials 0.000 claims description 7
- 229910052804 chromium Inorganic materials 0.000 claims description 6
- 229910052802 copper Inorganic materials 0.000 claims description 6
- 230000002431 foraging effect Effects 0.000 claims description 6
- 229910052742 iron Inorganic materials 0.000 claims description 6
- 229910052745 lead Inorganic materials 0.000 claims description 6
- 229910052748 manganese Inorganic materials 0.000 claims description 6
- 229910052758 niobium Inorganic materials 0.000 claims description 6
- 229910052715 tantalum Inorganic materials 0.000 claims description 6
- 229910052718 tin Inorganic materials 0.000 claims description 6
- 229910052721 tungsten Inorganic materials 0.000 claims description 6
- 229910052720 vanadium Inorganic materials 0.000 claims description 6
- 229910052726 zirconium Inorganic materials 0.000 claims description 6
- 239000000047 product Substances 0.000 description 27
- 230000000052 comparative effect Effects 0.000 description 17
- 239000000463 material Substances 0.000 description 13
- 230000007797 corrosion Effects 0.000 description 8
- 238000005260 corrosion Methods 0.000 description 8
- 238000003483 aging Methods 0.000 description 5
- 239000010936 titanium Substances 0.000 description 5
- 239000007789 gas Substances 0.000 description 3
- 230000035882 stress Effects 0.000 description 3
- 229910052799 carbon Inorganic materials 0.000 description 2
- 238000005336 cracking Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- RWSOTUBLDIXVET-UHFFFAOYSA-N Dihydrogen sulfide Chemical compound S RWSOTUBLDIXVET-UHFFFAOYSA-N 0.000 description 1
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 description 1
- 238000003723 Smelting Methods 0.000 description 1
- UCKMPCXJQFINFW-UHFFFAOYSA-N Sulphide Chemical compound [S-2] UCKMPCXJQFINFW-UHFFFAOYSA-N 0.000 description 1
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 238000000137 annealing Methods 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 239000010779 crude oil Substances 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 238000005242 forging Methods 0.000 description 1
- 229910000037 hydrogen sulfide Inorganic materials 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000011733 molybdenum Substances 0.000 description 1
- 239000003921 oil Substances 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 239000002244 precipitate Substances 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 229910052703 rhodium Inorganic materials 0.000 description 1
- 239000010948 rhodium Substances 0.000 description 1
- MHOVAHRLVXNVSD-UHFFFAOYSA-N rhodium atom Chemical compound [Rh] MHOVAHRLVXNVSD-UHFFFAOYSA-N 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 239000013535 sea water Substances 0.000 description 1
- -1 steam Substances 0.000 description 1
Classifications
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
- C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
- C22F1/10—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of nickel or cobalt or alloys based thereon
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/0075—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for rods of limited length
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C19/00—Alloys based on nickel or cobalt
- C22C19/03—Alloys based on nickel or cobalt based on nickel
- C22C19/05—Alloys based on nickel or cobalt based on nickel with chromium
- C22C19/051—Alloys based on nickel or cobalt based on nickel with chromium and Mo or W
- C22C19/055—Alloys based on nickel or cobalt based on nickel with chromium and Mo or W with the maximum Cr content being at least 20% but less than 30%
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C30/00—Alloys containing less than 50% by weight of each constituent
- C22C30/02—Alloys containing less than 50% by weight of each constituent containing copper
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C30/00—Alloys containing less than 50% by weight of each constituent
- C22C30/04—Alloys containing less than 50% by weight of each constituent containing tin or lead
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Manufacture And Refinement Of Metals (AREA)
Abstract
The invention provides an N09925 nickel-based alloy bar and a heat treatment method thereof, comprising the following steps: placing the N09925 nickel-based alloy bar blank into a muffle furnace, heating from room temperature to a first temperature, heating from the first temperature to a solid solution target temperature, preserving heat for 20-60 minutes, taking out the product, cooling by water, wherein the first temperature is 10-50 ℃ lower than the solid solution target temperature, and the solid solution target temperature is 900-1100 ℃; after the temperature of the muffle furnace is reduced to the room temperature, placing the N09925 nickel-based alloy bar blank subjected to water cooling into the muffle furnace, heating to a second temperature from the room temperature, heating to a first time-efficiency target temperature from the second temperature, preserving heat for 6-9 hours, then cooling to the second time-efficiency target temperature from the first time-efficiency target temperature, preserving heat for 6-9 hours, taking out the product, cooling in a water cooling mode to obtain a finished product, wherein the second temperature is lower than the first time-efficiency target temperature by 10-50 ℃, the first time-efficiency target temperature is 700-780 ℃, and the second time-efficiency target temperature is 600-660 ℃. The invention optimizes the heat treatment mode, effectively improves the mechanical property of the N09925 nickel-based alloy bar and improves the comprehensive quality thereof.
Description
Technical Field
The invention relates to the technical field of metal processing, in particular to an N09925 nickel-based alloy bar and a heat treatment method thereof.
Background
The UNS N09925 nickel-based alloy is a high-temperature corrosion-resistant alloy and has good corrosion resistance, heat resistance, fatigue performance and the like. The alloy mainly comprises nickel, molybdenum, rhodium, titanium, aluminum and other elements, and has higher melting point, thermal stability and mechanical property. The N09925 corrosion-resistant alloy can maintain excellent corrosion resistance in severe environments such as seawater, steam, chemical substances and the like, so that the N09925 corrosion-resistant alloy is widely applied to the fields of aerospace, ocean engineering, chemical industry and the like. In particular, the N09925 nickel-base alloys have sulfide stress cracking and stress corrosion cracking resistance in hydrogen sulfide containing crude oil and gas, and are often used in downhole and surface gas well components, such as oil and gas drilling equipment and the like.
The technological process of the N09925 nickel-base alloy mainly comprises links of smelting, casting, forging, annealing, heat treatment and the like. The N09925 nickel-based alloy has the adverse structural evolution problems of grain growth, phase decomposition, precipitation and the like, which can lead to the reduction of the high-temperature stability and corrosion resistance, and the heat treatment process can adjust the mechanical property and the physical property of the N09925 corrosion-resistant alloy to achieve the best effect. At present, the heat treatment process of the N09925 nickel-based alloy is generally high-temperature solution treatment and age hardening treatment, for example, solution treatment is carried out at the temperature of 1000 ℃, and aging treatment is carried out at the temperature of 600 ℃ after the treatment is finished, so that the mechanical properties of the product can be improved by the simple high-temperature solution treatment and age hardening treatment, but a great progress space is still provided.
Disclosure of Invention
In order to further improve the performance of the N09925 nickel-based alloy bar, the invention aims to provide the N09925 nickel-based alloy bar and a heat treatment method thereof, optimize the heat treatment mode, effectively improve the mechanical properties of the N09925 nickel-based alloy bar and improve the comprehensive quality of the N09925 nickel-based alloy bar.
In order to achieve the aim, the invention discloses a heat treatment method of an N09925 nickel-based alloy bar, which comprises the following steps:
melting and refining the preparation raw materials of the N09925 nickel-based alloy bar to obtain an N09925 nickel-based alloy bar blank;
placing the N09925 nickel-based alloy bar blank into a muffle furnace, heating from room temperature to a first temperature, then heating from the first temperature to a solid solution target temperature, preserving heat for 20-60 minutes at the solid solution target temperature, taking out the product, and cooling in a water cooling mode, wherein the first temperature is lower than the solid solution target temperature by 10-50 ℃, and the solid solution target temperature is 900-1100 ℃;
after the temperature of the muffle furnace is reduced to the room temperature, placing the N09925 nickel-based alloy bar blank after water cooling into the muffle furnace, heating from the room temperature to a second temperature, then heating from the second temperature to a first time-efficiency target temperature, preserving heat for 6-9 hours at the first time-efficiency target temperature, then cooling from the first time-efficiency target temperature to a second time-efficiency target temperature, preserving heat for 6-9 hours at the second time-efficiency target temperature, taking out the product, cooling by adopting a water cooling mode, and obtaining a finished product,
wherein the second temperature is lower than the first time-efficiency target temperature by 10-50 ℃, the first time-efficiency target temperature is 700-780 ℃, and the second time-efficiency target temperature is 600-660 ℃.
Compared with the prior art, the heat treatment method of the N09925 nickel-based alloy bar comprises the steps of carrying out high-temperature solution treatment firstly, then carrying out aging treatment, particularly, dividing the aging treatment into two stages, firstly preserving heat for 6-9 hours at a first aging target temperature, then preserving heat for 6-9 hours at a second aging target temperature, wherein the first aging target temperature is higher than the second aging target temperature, and carrying out aging treatment at different temperatures twice to improve the crystal structure of the N09925 nickel-based alloy and improve the yield strength of the N09925 nickel-based alloy bar; meanwhile, the cooling is carried out in the steps of high-temperature solution treatment and aging treatment by adopting a water cooling mode, so that the cooling speed is increased, and the process possibly causes the structural change of the N09925 nickel-based alloy to improve the yield strength; in addition, in the heat treatment method, the temperature is not increased to the required solution treatment temperature and aging treatment temperature at one time, but is increased to a temperature difference of 10-50 ℃ from the solution treatment temperature and the aging treatment temperature, on one hand, rapid temperature increase is not needed, so that the material performance is affected, on the other hand, the material gradually enters the solution treatment and the aging treatment through a temperature rise time gap of the subsequent temperature difference of 10-50 ℃, and the mechanical property of the N09925 nickel-based alloy bar can be effectively improved.
As a preferred manner, the solid solution target temperature is 996-1024 ℃, as an example, the solid solution target temperature is 1010 ℃, and the first temperature is 980 ℃; for another example, the solid solution target temperature is 1020 ℃, and the first temperature is 1000 ℃.
As a preferred mode, the first aging target temperature is 726-754 ℃, the second aging target temperature is 607-635 ℃, and as an example, the first aging target temperature is 740 ℃, the second temperature is 720 ℃, and the second aging target temperature is 620 ℃; for another example, the first aging target temperature is 730 ℃, the second temperature is 700 ℃, and the second aging target temperature is 610 ℃.
As a preferred way, the heating time from room temperature to the first temperature is 1-3 hours, which may be, by way of example but not limited to, 1 hour, 1.5 hours, 2 hours, 2.5 hours, 3 hours.
As a preferred way, the temperature rise time from the first temperature to the solid solution target temperature is 5 to 20 minutes, which may be, for example, but not limited to, 5 minutes, 10 minutes, 15 minutes, 20 minutes.
As a preferred way, the heating time from room temperature to the second temperature is 1-3 hours, which may be, by way of example but not limited to, 1 hour, 1.5 hours, 2 hours, 2.5 hours, 3 hours.
As a preferred way, the temperature rise time from the second temperature to the first time-efficient target temperature is 5-20 minutes, which may be, for example, but not limited to, 5 minutes, 10 minutes, 15 minutes, 20 minutes.
As a preferred way, the cooling time from the first aging target temperature to the second aging target temperature is 1-3 hours, which may be, by way of example and not limitation, 1 hour, 1.5 hours, 2 hours, 2.5 hours, 3 hours.
As a preferred mode, the N09925 nickel base alloy bar blank is put into a muffle furnace, heated from room temperature to 980 ℃ for two hours, 980 ℃ to 1010 ℃ for 10 minutes, 1010 ℃ for 30 minutes, taken out for water cooling, water cooling for 20 minutes,
and (3) when the temperature of the muffle furnace is reduced to the room temperature, placing the N09925 nickel-based alloy bar blank subjected to water cooling into the muffle furnace for aging treatment, heating to 720 ℃ from the room temperature, heating to 740 ℃ for two hours, heating to 10 minutes, preserving heat at 740 ℃ for 8 hours, reducing the temperature to 620 ℃ for two hours, preserving heat at 620 ℃ for 8 hours, taking out, cooling with water, and cooling with water for 20 minutes to obtain the finished product.
As a preferred mode, the N09925 nickel-based alloy bar is prepared from the following raw materials in percentage by mass:
C：＜0.03％，Si：＜0.5％，Mn：0.4-1.0％，P：＜0.03％，S：＜0.025％，Cr：19.5-22.5％，Fe：＞22％，Mo：2.5-3.5％，V：0.05-0.1％，Cu：1.5-3.0％，W：0.01-0.05％，Co：0.01-0.05％，Nb：＜0.5％，Al：0.1-0.5％，Ti：1.9-2.4％，Zr：＜0.001％，Sn：0.002-0.01％，Mg：0.003-0.01％，Ta：＜0.005％，Pb：＜0.01％，B：0.002-0.006％，Ni：42-46％。
as a preferred mode, the N09925 nickel-based alloy bar is prepared from the following raw materials in percentage by mass:
C：＜0.025％，Si：＜0.2％，Mn：0.4-0.6％，P：＜0.01％，S：＜0.01％，Cr：20.34-21.30％，Fe：＞24％，Mo：2.8-3.3％，V：0.05-0.1％，Cu：1.8-2.2％，W：0.01-0.05％，Co：0.01-0.05％，Nb：0.3-0.5％，Al：0.2-0.35％，Ti：2.1-2.35％，Zr：＜0.001％，Sn：0.002-0.01％，Mg：0.003-0.01％，Ta：＜0.005％，Pb：＜0.01％，B：0.002-0.006％，Ni：44.50-46％。
as a preferred mode, the N09925 nickel-based alloy bar is prepared from the following raw materials in percentage by mass:
C：0.0116％，Si：0.142％，Mn：0.419％，P：0.0078％，S：0.00033％，Cr：20.74％，Fe：24.83％，Mo：3.2％，V：0.0834％，Cu：1.85％，W：0.0457％，Co：0.0363％，Nb：0.425％，Al：0.321％，Ti：2.29％，Zr：＜0.001％，Sn：0.0054％，Mg：0.0065％，Ta：＜0.005％，Pb：0.0039％，B：0.0051％，Ni：45.56％。
correspondingly, the invention also provides an N09925 nickel-based alloy bar, which is prepared by adopting the heat treatment method of the N09925 nickel-based alloy bar.
Detailed Description
Other advantages and effects of the present invention will become apparent to those skilled in the art from the following disclosure, which describes the embodiments of the present invention with reference to specific examples. The invention may be practiced or carried out in other embodiments that depart from the specific details, and the details of the present description may be modified or varied from the spirit and scope of the present invention. It should be noted that the following embodiments and features in the embodiments may be combined with each other without conflict.
Example 1
The embodiment provides an N09925 nickel-based alloy bar, and the preparation raw materials of the N09925 nickel-based alloy bar comprise the following components in percentage by mass:
C：0.0116％，Si：0.142％，Mn：0.419％，P：0.0078％，S：0.00033％，Cr：20.74％，Fe：24.83％，Mo：3.2％，V：0.0834％，Cu：1.85％，W：0.0457％，Co：0.0363％，Nb：0.425％，Al：0.321％，Ti：2.29％，Zr：＜0.001％，Sn：0.0054％，Mg：0.0065％，Ta：＜0.005％，Pb：0.0039％，B：0.0051％，Ni：45.56％。
the heat treatment method of the N09925 nickel-based alloy bar comprises the following steps:
melting and refining the raw materials for preparing the N09925 nickel-based alloy bar to obtain an N09925 nickel-based alloy bar blank;
placing the N09925 nickel-based alloy bar blank into a muffle furnace, heating to 980 ℃ from room temperature for two hours, then heating to 1010 ℃ from 980 ℃ for 10 minutes, preserving heat for 30 minutes at 1010 ℃, taking out the product, performing water cooling for 20 minutes,
and (3) when the temperature of the muffle furnace is reduced to the room temperature, putting the N09925 nickel-based alloy bar blank subjected to water cooling into the muffle furnace, heating to 720 ℃ from the room temperature for two hours, then heating to 740 ℃ from 720 ℃ for 10 minutes, preserving heat for 8 hours at 740 ℃, then reducing the temperature to 620 ℃ from 740 ℃ for two hours, preserving heat for 8 hours at 620 ℃, taking out the product, carrying out water cooling for 20 minutes, and obtaining the finished product.
Example 2
The preparation raw materials of the N09925 nickel-based alloy bar of the embodiment are the same as those of the embodiment 1, except that the heat treatment method specifically comprises the following steps:
the heat treatment method of the N09925 nickel-based alloy bar comprises the following steps:
melting and refining the raw materials for preparing the N09925 nickel-based alloy bar to obtain an N09925 nickel-based alloy bar blank;
placing the N09925 nickel-based alloy bar blank into a muffle furnace, heating to 1000 ℃ from room temperature for 2 hours and 10 minutes, then heating to 1020 ℃ from 1000 ℃ for 15 minutes, preserving heat for 40 minutes at 1020 ℃, taking out the product, performing water cooling for 30 minutes,
and (3) when the temperature of the muffle furnace is reduced to the room temperature, putting the N09925 nickel-based alloy bar blank subjected to water cooling into the muffle furnace, heating to 720 ℃ from the room temperature for two hours, then heating to 740 ℃ from 720 ℃ for 10 minutes, preserving heat for 8 hours at 740 ℃, then reducing the temperature to 620 ℃ from 740 ℃ for two hours, preserving heat for 8 hours at 620 ℃, taking out the product, carrying out water cooling for 20 minutes, and obtaining the finished product.
Example 3
The preparation raw materials of the N09925 nickel-based alloy bar of the embodiment are the same as those of the embodiment 1, except that the heat treatment method specifically comprises the following steps:
the heat treatment method of the N09925 nickel-based alloy bar comprises the following steps:
melting and refining the raw materials for preparing the N09925 nickel-based alloy bar to obtain an N09925 nickel-based alloy bar blank;
placing the N09925 nickel-based alloy bar blank into a muffle furnace, heating to 970 ℃ from room temperature for 2 hours, then heating to 1000 ℃ from 970 ℃ for 20 minutes, preserving heat for 25 minutes at 1000 ℃, taking out the product, performing water cooling for 30 minutes,
and (3) when the temperature of the muffle furnace is reduced to the room temperature, placing the N09925 nickel-based alloy bar blank subjected to water cooling into the muffle furnace, heating to 730 ℃ from the room temperature for two hours, then heating to 750 ℃ from 730 ℃ for 10 minutes, preserving heat for 8 hours at 750 ℃, then reducing the temperature to 630 ℃ from 750 ℃ for two hours, preserving heat for 8 hours at 630 ℃, taking out the product, and performing water cooling for 25 minutes to obtain the finished product.
Example 4
The preparation raw materials of the N09925 nickel-based alloy bar of the embodiment are the same as those of the embodiment 1, except that the heat treatment method specifically comprises the following steps:
the heat treatment method of the N09925 nickel-based alloy bar comprises the following steps:
melting and refining the raw materials for preparing the N09925 nickel-based alloy bar to obtain an N09925 nickel-based alloy bar blank;
placing the N09925 nickel-based alloy bar blank into a muffle furnace, heating to 980 ℃ from room temperature for two hours, then heating to 1010 ℃ from 980 ℃ for 10 minutes, preserving heat for 30 minutes at 1010 ℃, taking out the product, performing water cooling for 20 minutes,
and (3) when the temperature of the muffle furnace is reduced to the room temperature, putting the N09925 nickel-based alloy bar blank subjected to water cooling into the muffle furnace, heating to 700 ℃ from the room temperature for two hours, then heating to 730 ℃ from 700 ℃ for 15 minutes, preserving heat for 9 hours at the temperature of 730 ℃, then reducing the temperature to 610 ℃ from 730 ℃ for two hours, preserving heat for 9 hours at the temperature of 610 ℃, taking out the product, performing water cooling for 20 minutes, and obtaining the finished product.
Comparative example 1
The comparative example N09925 nickel-base alloy bar was prepared from the same materials as example 1, except for the heat treatment steps, which were as follows:
the heat treatment method of the N09925 nickel-based alloy bar comprises the following steps:
putting the N09925 nickel-based alloy bar blank into a muffle furnace for solid solution treatment, heating to 980 ℃ from room temperature, heating to 1010 ℃ at 980 ℃ for two hours, preserving heat for 30 minutes at 1010 ℃ for 10 minutes, taking out air for cooling, cooling by water for 20 minutes,
and (3) when the temperature of the muffle furnace is reduced to the room temperature, placing the N09925 nickel-based alloy bar blank subjected to water cooling into the muffle furnace for aging treatment, heating to 720 ℃ from the room temperature for two hours, heating to 740 ℃ at 720 ℃ for 10 minutes, preserving heat at 740 ℃ for 8 hours, reducing the temperature to 620 ℃ for two hours, preserving heat at 620 ℃ for 8 hours, taking out air for cooling, and cooling with water for 20 minutes to obtain a finished product.
Comparative example 2
The comparative example N09925 nickel-base alloy bar was prepared from the same materials as example 1, except for the heat treatment steps, which were as follows:
the heat treatment method of the N09925 nickel-based alloy bar comprises the following steps:
melting and refining the preparation raw materials of the N09925 nickel-based alloy bar to obtain an N09925 nickel-based alloy bar blank;
putting the N09925 nickel-based alloy bar blank into a muffle furnace for solid solution treatment, heating to 980 ℃ from room temperature, heating to 1010 ℃ at 980 ℃ for two hours, preserving heat for 30 minutes at 1010 ℃ for 10 minutes, taking out for water cooling, water cooling for 20 minutes,
and (3) when the temperature of the muffle furnace is reduced to the room temperature, placing the N09925 nickel-based alloy bar blank subjected to water cooling into the muffle furnace for aging treatment, heating to 720 ℃ from the room temperature for two hours, heating to 740 ℃ at 720 ℃ for 10 minutes, preserving heat at 740 ℃ for 8 hours, reducing the temperature to 620 ℃ for two hours, preserving heat at 620 ℃ for 8 hours, taking out air for cooling, and cooling with water for 20 minutes to obtain a finished product.
Comparative example 3
The comparative example N09925 nickel-base alloy bar was prepared from the same materials as example 1, except for the heat treatment steps, which were as follows:
the heat treatment method of the N09925 nickel-based alloy bar comprises the following steps:
melting and refining the preparation raw materials of the N09925 nickel-based alloy bar to obtain an N09925 nickel-based alloy bar blank;
putting the N09925 nickel-based alloy bar blank into a muffle furnace for solid solution treatment, heating to 980 ℃ from room temperature, heating to 1010 ℃ at 980 ℃ for two hours, preserving heat for 30 minutes at 1010 ℃ for 10 minutes, taking out for water cooling, water cooling for 20 minutes,
and (3) when the temperature of the muffle furnace is reduced to the room temperature, placing the N09925 nickel-based alloy bar blank subjected to water cooling into the muffle furnace for aging treatment, heating to 720 ℃ from the room temperature, heating to 740 ℃ for two hours, heating to 10 minutes, preserving heat for 8 hours at 740 ℃, and water cooling for 20 minutes to obtain a finished product.
Comparative example 4
The comparative example N09925 nickel-base alloy bar was prepared from the same materials as example 1, except for the heat treatment steps, which were as follows:
the heat treatment method of the N09925 nickel-based alloy bar comprises the following steps:
melting and refining the preparation raw materials of the N09925 nickel-based alloy bar to obtain an N09925 nickel-based alloy bar blank;
putting the N09925 nickel-based alloy bar blank into a muffle furnace for solid solution treatment, heating to 980 ℃ from room temperature, heating to 1010 ℃ at 980 ℃ for two hours, preserving heat for 30 minutes at 1010 ℃ for 10 minutes, taking out for water cooling, water cooling for 20 minutes,
and (3) when the temperature of the muffle furnace is reduced to the room temperature, placing the N09925 nickel-based alloy bar blank subjected to water cooling into the muffle furnace for aging treatment, heating to 620 ℃ from the room temperature, keeping the temperature at 620 ℃ for 8 hours when the blank is used, taking out the blank, water-cooling, and water-cooling for 20 minutes to obtain a finished product.
Comparative example 5
The comparative example N09925 nickel-base alloy bar was prepared from the same materials as example 1, except for the heat treatment steps, which were as follows:
the heat treatment method of the N09925 nickel-based alloy bar comprises the following steps:
melting and refining the raw materials for preparing the N09925 nickel-based alloy bar to obtain an N09925 nickel-based alloy bar blank;
placing the N09925 nickel-based alloy bar blank into a muffle furnace, heating to 1010 ℃ from room temperature for 2 hours and 10 minutes, preserving heat for 30 minutes at 1010 ℃, taking out the product to water-cool for 20 minutes after preserving heat for 30 minutes,
and (3) when the temperature of the muffle furnace is reduced to the room temperature, putting the N09925 nickel-based alloy bar blank subjected to water cooling into the muffle furnace, heating to 720 ℃ from the room temperature for two hours, then heating to 740 ℃ from 720 ℃ for 10 minutes, preserving heat for 8 hours at 740 ℃, then reducing the temperature to 620 ℃ from 740 ℃ for two hours, preserving heat for 8 hours at 620 ℃, taking out the product, carrying out water cooling for 20 minutes, and obtaining the finished product.
Comparative example 6
The heat treatment method of the N09925 nickel-based alloy bar comprises the following steps:
melting and refining the raw materials for preparing the N09925 nickel-based alloy bar to obtain an N09925 nickel-based alloy bar blank;
placing the N09925 nickel-based alloy bar blank into a muffle furnace, heating to 980 ℃ from room temperature for two hours, then heating to 1010 ℃ from 980 ℃ for 10 minutes, preserving heat for 30 minutes at 1010 ℃, taking out the product, performing water cooling for 20 minutes,
and (3) when the temperature of the muffle furnace is reduced to the room temperature, putting the N09925 nickel-based alloy bar blank subjected to water cooling into the muffle furnace, heating to 740 ℃ from the room temperature, keeping the temperature at 740 ℃ for 2 hours and 10 minutes, then reducing the temperature to 620 ℃ from 740 ℃ for two hours, keeping the temperature at 620 ℃ for 8 hours, taking out the product, carrying out water cooling for 20 minutes, and obtaining the finished product.
Mechanical properties of the N09925 nickel-base alloy bars obtained in the examples and comparative examples were tested, and the results are shown in table 1.
Table 1N09925 Nickel-based alloy bar mechanical properties
From the data in Table 1, it is clear that the mechanical properties of the N09925 nickel-based alloy bar prepared by the preparation method can meet the standard yield strength of ASTMB637 of more than 758Mpa and the elongation after break of more than 18%.
In the solution treatment and aging treatment of comparative example 1, an air cooling mode is adopted, the yield strength of the alloy cannot meet the standard yield strength 758Mpa of ASTMB637, and the reason is that in the system, the air cooling speed is low, the cooling is not obvious, and the material cannot be cooled to the room temperature quickly, so that the brittleness and hardness of the material cannot meet the requirements, and the yield strength is not suitable.
In the ageing treatment of the comparative example 2, an air cooling mode is adopted, the yield strength of the material cannot meet the standard yield strength of 758Mpa of ASTMB637, because the ageing cooling adopts air cooling and the solid solution treatment adopts water cooling, the stress in the material is increased, and the ageing temperature is overlong, so that the performance of the material is impacted, and the yield strength is unqualified;
the comparative examples 3 to 4 all use only 1 time of aging treatment process, and the yield strength of the alloy fails to meet the standard yield strength of 758Mpa of ASTMB637, and the yield strength is not improved enough due to one time of aging treatment.
In comparative example 5, room temperature is directly heated to the solution treatment temperature, the yield strength of the alloy fails to meet the standard yield strength of 758Mpa of ASTMB637, and the temperature rise curve is too fast due to the fact that the alloy is directly heated to the solution temperature, so that precipitates in a unidirectional region cannot be completely precipitated in time, and the quantity of supersaturated solid solution is insufficient, and the yield strength of the material is not qualified.
In comparative example 6, the room temperature is directly heated to the aging treatment temperature, and the yield strength of the alloy fails to meet the standard yield strength of 758Mpa of ASTMB637, because the room temperature is directly heated to the aging treatment temperature, the temperature rising curve is too fast, the temperature in the muffle furnace does not reach the real temperature, and the yield strength is not qualified.
The foregoing description of the preferred embodiments of the present invention is not intended to limit the scope of the claims, which follow, as defined in the claims.
Claims (10)
1. The heat treatment method of the N09925 nickel-based alloy bar is characterized by comprising the following steps of:
melting and refining the preparation raw materials of the N09925 nickel-based alloy bar to obtain an N09925 nickel-based alloy bar blank;
placing the N09925 nickel-based alloy bar blank into a muffle furnace, heating from room temperature to a first temperature, then heating from the first temperature to a solid solution target temperature, preserving heat for 20-60 minutes at the solid solution target temperature, taking out the product, and cooling in a water cooling mode, wherein the first temperature is lower than the solid solution target temperature by 10-50 ℃, and the solid solution target temperature is 900-1100 ℃;
after the temperature of the muffle furnace is reduced to the room temperature, placing the N09925 nickel-based alloy bar blank after water cooling into the muffle furnace, heating from the room temperature to a second temperature, then heating from the second temperature to a first time-efficiency target temperature, preserving heat for 6-9 hours at the first time-efficiency target temperature, then cooling from the first time-efficiency target temperature to a second time-efficiency target temperature, preserving heat for 6-9 hours at the second time-efficiency target temperature, taking out the product, cooling by adopting a water cooling mode, and obtaining a finished product,
wherein the second temperature is 10-50deg.C lower than the first time-efficiency target temperature, the first time-efficiency target temperature is 700-780 deg.C, and the second time-efficiency target temperature is 600-660 deg.C.
2. The method of claim 1, wherein the heating time from room temperature to the first temperature is 1 to 3 hours.
3. The method of claim 1, wherein the heating time from the first temperature to the solution target temperature is between 5 minutes and 20 minutes.
4. The method of claim 1, wherein the heating time from room temperature to the second temperature is 1-3 hours.
5. The method of claim 1, wherein the heating time from the second temperature to the first time-efficient target temperature is between 5 minutes and 20 minutes.
6. The method of claim 1, wherein the cooling time from the first aging target temperature to the second aging target temperature is 1-3 hours.
7. The method for heat treating an N09925 nickel-base alloy bar according to claim 1,
placing the N09925 nickel-base alloy bar blank into a muffle furnace, heating to 980 ℃ from room temperature for two hours, heating to 1010 ℃ at 980 ℃ for 10 minutes, preserving heat at 1010 ℃ for 30 minutes, taking out, cooling with water for 20 minutes,
and (3) when the temperature of the muffle furnace is reduced to the room temperature, placing the N09925 nickel-based alloy bar blank subjected to water cooling into the muffle furnace for aging treatment, heating to 720 ℃ from the room temperature, heating to 740 ℃ for two hours, heating to 10 minutes, preserving heat at 740 ℃ for 8 hours, reducing the temperature to 620 ℃ for two hours, preserving heat at 620 ℃ for 8 hours, taking out, cooling with water, and cooling with water for 20 minutes to obtain the finished product.
8. The method of claim 1, wherein the N09925 nickel-base alloy bar comprises, in mass percent:
C：＜0.03％，Si：＜0.5％，Mn：0.4-1.0％，P：＜0.03％，S：＜0.025％，Cr：19.5-22.5％，Fe：＞22％，Mo：2.5-3.5％，V：0.05-0.1％，Cu：1.5-3.0％，W：0.01-0.05％，Co：0.01-0.05％，Nb：＜0.5％，Al：0.1-0.5％，Ti：1.9-2.4％，Zr：＜0.001％，Sn：0.002-0.01％，Mg：0.003-0.01％，Ta：＜0.005％，Pb：＜0.01％，B：0.002-0.006％，Ni：42-46％。
9. the method of claim 8, wherein the N09925 nickel-base alloy bar comprises, in mass percent:
C：＜0.025％，Si：＜0.2％，Mn：0.4-0.6％，P：＜0.01％，S：＜0.01％，Cr：20.34-21.30％，Fe：＞24％，Mo：2.8-3.3％，V：0.05-0.1％，Cu：1.8-2.2％，W：0.01-0.05％，Co：0.01-0.05％，Nb：0.3-0.5％，Al：0.2-0.35％，Ti：2.1-2.35％，Zr：＜0.001％，Sn：0.002-0.01％，Mg：0.003-0.01％，Ta：＜0.005％，Pb：＜0.01％，B：0.002-0.006％，Ni：44.50-46％。
10. an N09925 nickel-base alloy rod, characterized in that it is produced by a heat treatment method according to any one of claims 1-9, with an N09925 nickel-base alloy rod.
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