CN104674144A - Heat treatment method of large-size, high-strength and fine-grain nickel-based superalloy forge piece for nuclear reactor - Google Patents
Heat treatment method of large-size, high-strength and fine-grain nickel-based superalloy forge piece for nuclear reactor Download PDFInfo
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Abstract
The invention discloses a heat treatment method of a large-size, high-strength and fine-grain nickel-based superalloy forge piece for a nuclear reactor, and belongs to the technical field of superalloy heat treatment. The heat treatment method comprises steps as follows: by means of maximum power of a heat treatment furnace, the forge piece is heated to a range from 450 DEG C to 500 DEG C for heat preservation, and the heat preservation time of every 1 mm effective forge piece thickness is 0.5-1.0 min; the forge piece is heated continuously to a range from 1,000 DEG C to 1,150 DEG C at a heating rate not higher than 60 DEG C/h for heat preservation, and the heat preservation time of every 1 mm effective forge piece thickness is 1-1.5 min; the forge piece is taken out of the furnace and is subjected to water cooling to reach the room temperature; the forge piece subjected to the water cooling to reach the room temperature is heated continuously, by means of the maximum power of the heat treatment furnace, the forge piece is heated to a range from 450 DEG C to 500 DEG C for heat preservation, and the heat preservation time of every 1 mm effective forge piece thickness is 0.5-1.0 min; the forge piece is heated continuously and is heated to a range from 700 DEG C to 730 DEG C at a heating rate not higher than 60 DEG C/h for heat preservation, and the heat preservation time of every 1 mm effective forge piece thickness is 6.0-9.0 min; the forge piece is taken out of the furnace and subjected to air cooling. Therefore, design requirements of nuclear reactor internals can be met.
Description
Technical field
The invention belongs to superalloy technical field of heat treatment, particularly relate to a kind of nuclear power heap large size high-strength thin-crystal nickel-based high-temperature alloy forge piece heat treating method.
Background technology
GH690 alloy is a kind of ni-base wrought superalloy, because high chromium content (Cr >=28wt%) makes it have high stress corrosion resistance in the core work condition environments such as alkalescence or neutral water, alternative Inconel600 and 800 alloys are widely used in the components such as the steam generator heat-transfer pipe in domestic and international Multiple Type Novel engineering reactor at present.A new generation's engineering reactor, because having small volume, high thermal efficiency and high reliability, is about to the main force's heap-type becoming the following military project of China and energy source and power.Because its special Structural Design Requirement also needs to use large size high-strength thin-crystal GH690 nickel-based high-temperature alloy forge piece flange in a large number.This component need bear the fatigue and cyclic stress of room temperature ~ 350 DEG C saturation steam, and applying working condition is complicated severe.Therefore require this alloy forged piece in the environment such as former water except should having high stress corrosion resistance, also should have the even grained tissue being narrower than 5 grades, to make alloy, there is higher toughness and tenacity.In addition, another important component of engineering reactor of new generation---in heap, spreader plate also needs to use large size GH690 alloy forged piece in a large number.
GH690 still belongs to the first time both at home and abroad as new and effective being applied in of vapour generator end cap.In the world, only there are same structure and requirement in Russia, but 508-III steel of the stainless steel anticorrosion layer that has been inner wall overlaying that Russia adopts, and materials and process is all not identical with China technology.Developed countries can have been produced thickness and reach 60mm and the thick forging plate of above nickel-base alloy, and RCCM specification (design of pressurized-water reactor nuclear islands equipment and construction rule) has been included in the design of slab in.
Due to the reason such as technical know-how and application-aware, domesticly the correlation parameter that large size GH690 forging is produced cannot be known, especially thermal treatment process.This alloy is at high temperature substantially without Second Phase Precipitation, therefore the microstructure impact of high-temperature heat treatment process alloy is very responsive, and existing thermal treatment process can not meet nuclear in-pile component nickel-base alloy forging mechanical property technical requirement as shown in table 1.Before this, my unit achieves certain progress in the thin crystalline substance forging of large size GH690 nickel base superalloy rod base, but relevant this alloy large size forging heat treating method is domestic not yet breaks through so far.Therefore, for this forging, new thermal treatment process must be developed, to improve further and the performance of stable GH690 alloy, thus meet the application requiring of advanced Nuclear Power high-efficient steam generator.
Table 1 nuclear in-pile component nickel-base alloy forging mechanical property technical requirement
Summary of the invention
The object of this invention is to provide a kind of heat treating method of nuclear in-pile component large size high-strength thin-crystal nickel-based high-temperature alloy forge piece, the forging after the method process can meet the application requiring of advanced Nuclear Power high-efficient steam generator.
It is GH690 nickel base superalloy that the present invention is used for material, and diameter D is Φ 320 ~ 480mm, and height h is that the solid forging of 150 ~ 200mm is heat-treated; Specifically comprise the following steps:
(1) with the peak power of heat treatment furnace, forging is heated to 450 ~ 500 DEG C of scope inside holding, soaking time is every 1 millimeter of forging net thickness insulation 0.5 ~ 1.0 minute;
(2) continue to add hot forging, with the temperature rise rate of 50 ~ 60 DEG C/h, forging is heated to 1000 ~ 1150 DEG C of scope inside holding, soaking time is every 1 millimeter of forging net thickness insulation 1 ~ 1.5 minute;
(3) forging come out of the stove and water-cooled to room temperature;
(4) continued to heat by the forging of water-cooled to room temperature, with the peak power of heat treatment furnace, forging is heated to 450 ~ 500 DEG C of scope inside holding, soaking time is every 1 millimeter of forging net thickness insulation 0.5 ~ 1.0 minute;
(5) continue to add hot forging, with the temperature rise rate of 50 ~ 60 DEG C/h, forging is heated to 700 ~ 730 DEG C of scope inside holding, soaking time is every 1 millimeter of forging net thickness insulation 6.0 ~ 9.0 minutes;
(6) forging is come out of the stove and air cooling.
Described thermal treatment adopts electrically heated ring furnace; The temperature control precision of electrically heated ring furnace is ± 10 DEG C.
In the heat treating method of nuclear in-pile component large size high-strength thin-crystal nickel-based high-temperature alloy forge piece of the present invention, the diameter (D) of large size high-strength thin-crystal nickel-based high-temperature alloy forge piece is 320 ~ 480mm, and highly (h) is 150 ~ 200mm.
In the heat treating method of nuclear in-pile component large size high-strength thin-crystal nickel-based high-temperature alloy forge piece of the present invention, large size high-strength thin-crystal nickel-based high-temperature alloy forge piece comprises following component by percentage to the quality:
Fe:8.0 ~ 10.0%, Cr:29.0 ~ 30.0%, Al:0.25 ~ 0.35%, Ti:0.4 ~ 0.5%, Cu:0.01 ~ 0.02%, Co≤0.05%, 0.015≤C≤0.03, Si≤0.1%, Mn≤0.3%, B≤0.001%, S≤0.0005%, P≤0.005%, surplus are Ni and inevitable impurity.
The heat treating method of nuclear in-pile component large size high-strength thin-crystal nickel-based high-temperature alloy forge piece of the present invention, the mechanical property of forging after the method thermal treatment is as follows:
Room temperature tensile intensity is 650 ~ 700MPa; Room-temperature yield strength is 280 ~ 320MPa; 350 DEG C of tensile strength are 550 ~ 600MPa; 350 DEG C of yield strengths are 225 ~ 260MPa.
Large size nickel-based high-temperature alloy forge piece after thermal treatment of the present invention avoids the grain growth after ordinary method thermal treatment, maintains original state carefully brilliant, and the more original state of grain fineness number is more even, and mean grain size is narrower than 5.5 grades.
After adopting the present invention to heat-treat nuclear in-pile component large size high-strength thin-crystal nickel-based high-temperature alloy forge piece, original state can be kept carefully brilliant, and the more original state of grain fineness number is more even, room temperature and 350 DEG C of hot strengths meet nuclear in-pile component design requirements, UT (Ultrasonic Testing) does not find excessive defect, liquid penetration examination does not find defect vestige, effectively can ensure the performance of forging after finished heat treatment, meet the technical requirement of nuclear in-pile component large size forging.
Accompanying drawing explanation
Fig. 1 is the forging ' s block dimension schematic diagram of embodiment 1,2.
Fig. 2 is the axial schematic diagram in forging mechanical property sample position of embodiment 1,2.
Fig. 3 is the radial schematic diagram in forging mechanical property sample position of embodiment 1,2.
Fig. 4 be embodiment 1 forging original grain state.
Fig. 5 is the forging heart portion crystalline form after embodiment 1 adopts heat treating method process of the present invention.
Fig. 6 be embodiment 2 forging original grain state.
Fig. 7 is the forging heart portion crystalline form after embodiment 2 adopts heat treating method of the present invention.
Embodiment
Below in conjunction with specific embodiment, set forth the present invention further.It is pointed out that following examples only for illustration of the present invention, and be not intended to limit the scope of the invention.The improvement made according to the present invention of technician and adjustment, still belong to protection scope of the present invention in actual applications.
Embodiment 1
The heat treating method of nuclear in-pile component large size high-strength thin-crystal nickel-based high-temperature alloy forge piece of the present invention, for heat-treating engineering reactor inner member large size GH690 nickel-based high-temperature alloy forge piece of new generation, diameter of forgings (D) is 360mm, highly (h) is 160mm, for solid forging, composition is in table 2.Adopt electrically heated ring furnace, the temperature control precision of electrically heated ring furnace is ± 10 DEG C, comprises the following steps:
The first step, is heated to 480 DEG C of insulations by forging with the peak power of heat treatment furnace, is incubated 40 minutes;
Second step, continues to add hot forging, with the temperature rise rate of 55 DEG C/h, forging is heated to 1080 DEG C of insulations, is incubated 80 minutes;
3rd step, forging come out of the stove and water-cooled to room temperature;
4th step, continues to heat by the forging of water-cooled to room temperature, with the peak power of heat treatment furnace, forging is heated to 480 DEG C of insulations, is incubated 40 minutes;
5th step, continues to add hot forging, with the temperature rise rate of 55 DEG C/h, forging is heated to 715 DEG C of insulations, is incubated 10 hours;
6th step, forging is come out of the stove and air cooling.
The forging obtained is carried out mechanics properties testing sampling, and sampling mode as shown in Figures 1 to 3.
Room temperature and 350 DEG C of mechanics properties testing (surveying two samples respectively) are carried out to gained sample, obtains room temperature and 350 DEG C of intensity as table 3.
After forging original grain state and thermal treatment, forging heart portion crystalline form respectively as shown in Figure 4 and Figure 5.Result shows, after heat treatment, large size GH690 nickel-based high-temperature alloy forge piece avoids the grain growth after ordinary method thermal treatment, maintains original state carefully brilliant, and the more original state of grain fineness number is more even, is 6.0 grades.Room temperature tensile intensity is up to more than 690MPa, room-temperature yield strength is up to more than 310MPa, 350 DEG C of tensile strength up to more than 580MPa, 350 DEG C of yield strengths up to more than 255MPa, far away higher than the mechanical property technical indicator of nuclear in-pile component with large size nickel-base alloy forging.
Embodiment 2
The heat treating method of nuclear in-pile component large size high-strength thin-crystal nickel-based high-temperature alloy forge piece of the present invention, for heat-treating engineering reactor inner member large size GH690 nickel-based high-temperature alloy forge piece of new generation, diameter of forgings is (D) 380mm, highly (h) is 180mm, for solid forging, composition is in table 2.Adopt electrically heated ring furnace, the temperature control precision of electrically heated ring furnace is ± 10 DEG C, comprises the following steps:
The first step, is heated to 500 DEG C of insulations with the peak power of heat treatment furnace by forging, is incubated 45 minutes;
Second step, continues to add hot forging, with the temperature rise rate of 50 DEG C/h, forging is heated to 1120 DEG C of insulations, is incubated 90 minutes;
3rd step, forging come out of the stove and water-cooled to room temperature;
4th step, continues to heat by the forging of water-cooled to room temperature, with the peak power of heat treatment furnace, forging is heated to 500 DEG C of insulations, is incubated 45 minutes;
5th step, continues to add hot forging, with the temperature rise rate of 50 DEG C/h, forging is heated to 720 DEG C of scope inside holding, is incubated 12.75 hours;
6th step, forging is come out of the stove and air cooling.
The forging obtained is carried out mechanics properties testing sampling, and sampling mode as shown in Figures 1 to 3.
Room temperature and 350 DEG C of mechanics properties testing (surveying two samples respectively) are carried out to gained sample, obtains room temperature and 350 DEG C of intensity as table 3.
After forging original grain state and thermal treatment, forging heart portion crystalline form respectively as shown in Figure 6 and Figure 7.
Result shows, after heat treatment, large size GH690 nickel-based high-temperature alloy forge piece avoids the grain growth after ordinary method thermal treatment, maintains original state carefully brilliant, and the more original state of grain fineness number is more even, is 5.5 grades.Room temperature tensile intensity is up to more than 675MPa, room-temperature yield strength is up to more than 300MPa, 350 DEG C of tensile strength up to more than 565MPa, 350 DEG C of yield strengths up to more than 245MPa, far away higher than the mechanical property technical indicator of nuclear in-pile component with large size nickel-base alloy forging.
The chemical composition (wt%) of table 2 embodiment of the present invention large size high-strength thin-crystal GH690 nickel-base alloy forging
Mechanical property after the thermal treatment of table 3 embodiment of the present invention large size high-strength thin-crystal GH690 nickel-base alloy forging
Claims (5)
1. a nuclear power heap large size high-strength thin-crystal nickel-based high-temperature alloy forge piece heat treating method, for being GH690 nickel base superalloy to material, diameter D is Φ 320 ~ 480mm, and height h is that the solid forging of 150 ~ 200mm is heat-treated; It is characterized in that, comprise the following steps:
(1) with the peak power of heat treatment furnace, forging is heated to 450 ~ 500 DEG C of scope inside holding, soaking time is every 1 millimeter of forging net thickness insulation 0.5 ~ 1.0 minute;
(2) continue to add hot forging, with the temperature rise rate of 50 ~ 60 DEG C/h, forging is heated to 1000 ~ 1150 DEG C of scope inside holding, soaking time is every 1 millimeter of forging net thickness insulation 1 ~ 1.5 minute;
(3) forging come out of the stove and water-cooled to room temperature;
(4) continued to heat by the forging of water-cooled to room temperature, with the peak power of heat treatment furnace, forging is heated to 450 ~ 500 DEG C of scope inside holding, soaking time is every 1 millimeter of forging net thickness insulation 0.5 ~ 1.0 minute;
(5) continue to add hot forging, with the temperature rise rate of 50 ~ 60 DEG C/h, forging is heated to 700 ~ 730 DEG C of scope inside holding, soaking time is every 1 millimeter of forging net thickness insulation 6.0 ~ 9.0 minutes;
(6) forging is come out of the stove and air cooling.
2. heat treating method according to claim 1, is characterized in that, described thermal treatment adopts electrically heated ring furnace; The temperature control precision of electrically heated ring furnace is ± 10 DEG C.
3. heat treating method according to claim 1, is characterized in that, described large size high-strength thin-crystal nickel-based high-temperature alloy forge piece comprises following component by percentage to the quality:
Fe:8.0 ~ 10.0%, Cr:29.0 ~ 30.0%, Al:0.25 ~ 0.35%, Ti:0.4 ~ 0.5%, Cu:0.01 ~ 0.02%, Co≤0.05%, 0.015≤C≤0.03, Si≤0.1%, Mn≤0.3%, B≤0.001%, S≤0.0005%, P≤0.005%, surplus are Ni and inevitable impurity.
4. heat treating method according to claim 1, is characterized in that, the mechanical property of the large size nickel-based high-temperature alloy forge piece after thermal treatment is as follows:
Room temperature tensile intensity is 650 ~ 700MPa; Room-temperature yield strength is 280 ~ 320MPa; 350 DEG C of tensile strength are 550 ~ 600MPa; 350 DEG C of yield strengths are 225 ~ 260MPa.
5. heat treating method according to claim 1, is characterized in that, the equal grain fineness number of the large size nickel-based high-temperature alloy forge piece after thermal treatment is narrower than 5.5 grades.
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| CN107723637A (en) * | 2017-10-16 | 2018-02-23 | 太原钢铁(集团)有限公司 | The method for handling nickel base superalloy cold rolled tube |
| CN107723637B (en) * | 2017-10-16 | 2019-05-17 | 太原钢铁(集团)有限公司 | The method for handling nickel base superalloy cold rolled tube |
| CN111474968A (en) * | 2020-04-30 | 2020-07-31 | 厦门中翎易优创科技有限公司 | Temperature control method and system of temperature therapeutic apparatus |
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