CN104674144B - Nuclear power heap large scale high-strength thin-crystal nickel-based high-temperature alloy forge piece heat treatment method - Google Patents
Nuclear power heap large scale high-strength thin-crystal nickel-based high-temperature alloy forge piece heat treatment method Download PDFInfo
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Abstract
A kind of nuclear power heap large scale high-strength thin-crystal nickel-based high-temperature alloy forge piece heat treatment method, belongs to high temperature alloy technical field of heat treatment.Step includes: with the peak power of heat-treatment furnace, forging is heated to 450～500 DEG C of insulations, and temperature retention time is that every 1 millimeter of forging effective thickness is incubated 0.5～1.0 minute；Continuing to add hot forging, be incubated in the range of forging being heated to 1000～1150 DEG C with the heating rate of no more than 60 DEG C/h, temperature retention time is that every 1 millimeter of forging effective thickness is incubated 1～1.5 minute；Forging is come out of the stove and water-cooled is to room temperature；The forging of water-cooled to room temperature being continued heating, with the peak power of heat-treatment furnace, forging is heated to 450～500 DEG C of insulations, temperature retention time is that every 1 millimeter of forging effective thickness is incubated 0.5～1.0 minute；Continuing to add hot forging, with the heating rate of no more than 60 DEG C/h, forging is heated to 700～730 DEG C of insulations, temperature retention time is that every 1 millimeter of forging effective thickness is incubated 6.0～9.0 minutes；Forging is come out of the stove and air cooling.Disclosure satisfy that the design requirement of nuclear in-pile component.
Description
Technical field
The invention belongs to high temperature alloy technical field of heat treatment, particularly relate to a kind of nuclear power heap large scale high-strength
Thin crystal nickel-based high-temperature alloy forging heat treatment method.
Background technology
GH690 alloy is a kind of ni-base wrought superalloy, because high chromium content (Cr >=28wt%) makes it at alkali
Property or the core work condition environment such as neutral water in there is high stress corrosion resistance, the most substituted Inconel600 and
800 alloys are widely used in the steam generator heat-transfer pipe etc. in domestic and international Multiple Type Novel engineering reactor
Component.A new generation's engineering reactor, because having small size, high thermal efficiency and high reliability, will become China not
Carry out main force's heap-type of military project and energy source and power.Owing to its special Structural Design Requirement also needs to use large scale in a large number
High-strength thin-crystal GH690 nickel-based high-temperature alloy forge piece flange.This component is subjected to room temperature～350 DEG C of saturated vapors
Fatigue and cyclic stress, applying working condition is complicated severe.Should have therefore it is required that this alloy forged piece removes in the environment such as former water
Have outside high stress corrosion resistance, also should have and be narrower than the even grained tissue of 5 grades so that alloy has higher
Toughness and tenacity.Additionally, flow distribution plate also needs in a large number in another important component heap of a new generation's engineering reactor
Use large scale GH690 alloy forged piece.
GH690 at home and abroad still belongs to the first time as the application of new and effective steam generator end cap.In the world,
There are identical structure and requirement in only Russia, but Russia uses 508-III steel of inner wall overlaying rustless steel anticorrosion layer,
Material and technique and China technology all differ.Developed countries can produce thickness reach 60mm and more than
Nickel-base alloy thickness forging plate, and the design of slab included in RCCM specification (presurized water reactor nuclear islands equipment design
Regular with building).
Due to technical know-how and the reason such as application is sensitive, domestic cannot know what large scale GH690 forging produced
Relevant parameter, especially Technology for Heating Processing.This alloy is the most substantially without Second Phase Precipitation, therefore at high-temperature hot
The microscopic structure of alloy is affected very sensitive by science and engineering skill, and existing Technology for Heating Processing can not meet as shown in table 1
Nuclear in-pile component nickel-base alloy forging mechanical property technical requirement.Before this, my unit is at big chi
The thin brilliant forging of very little GH690 nickel base superalloy rod base achieves and is necessarily in progress, but this alloy large size relevant
Forging heat treatment method is domestic the most not yet to be broken through.Therefore, for this forging, it is necessary to develop new heat treatment
Technique, to improve and to stablize the performance of GH690 alloy further, thus meets advanced Nuclear Power high-efficiency steam and sends out
The application requirement of raw device.
Table 1 nuclear in-pile component nickel-base alloy forging mechanical property technical requirement
Summary of the invention
It is an object of the invention to provide a kind of nuclear in-pile component large scale high-strength thin-crystal nickel base superalloy forging
The heat treatment method of part, the forging after the method processes can meet advanced Nuclear Power high-efficient steam generator
Application requirement.
The present invention is for being GH690 nickel base superalloy to material, and diameter D is Φ 320～480mm, high
Spend the solid forging that h is 150～200mm and carry out heat treatment；Specifically include following steps:
(1) it is incubated in the range of forging being heated to 450～500 DEG C with the peak power of heat-treatment furnace, during insulation
Between be that every 1 millimeter of forging effective thickness is incubated 0.5～1.0 minute；
(2) continue to add hot forging, with the heating rate of 50～60 DEG C/h, forging is heated to 1000～1150 DEG C
In the range of be incubated, temperature retention time is that every 1 millimeter of forging effective thickness is incubated 1～1.5 minute；
(3) forging is come out of the stove and water-cooled is to room temperature；
(4) forging of water-cooled to room temperature is continued heating, with the peak power of heat-treatment furnace, forging is heated to
Being incubated in the range of 450～500 DEG C, temperature retention time is that every 1 millimeter of forging effective thickness is incubated 0.5～1.0 minute；
(5) continue to add hot forging, with the heating rate of 50～60 DEG C/h, forging is heated to 700～730 DEG C of models
Enclosing inside holding, temperature retention time is that every 1 millimeter of forging effective thickness is incubated 6.0～9.0 minutes；
(6) forging is come out of the stove and air cooling.
Described heat treatment uses electrical heating annular furnace；The temperature control precision of electrical heating annular furnace is ± 10 DEG C.
The heat treatment side of nuclear in-pile component large scale high-strength thin-crystal nickel-based high-temperature alloy forge piece of the present invention
In method, the diameter (D) of large scale high-strength thin-crystal nickel-based high-temperature alloy forge piece is 320～480mm, highly (h)
It is 150～200mm.
The heat treatment side of nuclear in-pile component large scale high-strength thin-crystal nickel-based high-temperature alloy forge piece of the present invention
In method, large scale high-strength thin-crystal nickel-based high-temperature alloy forge piece includes 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 treatment side of nuclear in-pile component large scale high-strength thin-crystal nickel-based high-temperature alloy forge piece of the present invention
Method, forging mechanical property after the method heat treatment is as follows:
Room temperature tensile intensity is 650～700MPa；Room-temperature yield strength is 280～320MPa；350 DEG C of tensions
Intensity is 550～600MPa；350 DEG C of yield strengths are 225～260MPa.
Large scale nickel-based high-temperature alloy forge piece after heat treatment of the present invention avoids the crystalline substance after conventional method heat treatment
Grain length is big, maintains original state the most brilliant, and the more original state of grain size is more uniformly distributed, and mean grain size is narrower than 5.5
Level.
Use the present invention that nuclear in-pile component large scale high-strength thin-crystal nickel-based high-temperature alloy forge piece is carried out at heat
After reason, original state can be kept the most brilliant, and the more original state of grain size is more uniformly distributed, room temperature and 350 DEG C of elevated temperature strengths
Meeting nuclear in-pile component design requirement, ultrasonic examination does not finds that excessive defect, liquid penetration examination do not find
Defect vestige, can be effectively ensured the performance of forging after finished heat treatment, meet nuclear in-pile component large scale and forge
The technical requirement of part.
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 forging mechanical property sample position radially schematic diagram 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 uses heat treatment method of the present invention to process.
Fig. 6 be embodiment 2 forging original grain state.
Fig. 7 is the forging heart portion crystalline form after embodiment 2 uses heat treatment method of the present invention.
Detailed description of the invention
Below in conjunction with specific embodiment, the present invention is expanded on further.It is pointed out that following example are only used
In the explanation present invention, rather than limit protection scope of the present invention.Technical staff is according to this in actual applications
Invent the improvement and adjustment made, still fall within protection scope of the present invention.
Embodiment 1
The heat treatment method of nuclear in-pile component large scale high-strength thin-crystal nickel-based high-temperature alloy forge piece of the present invention, uses
In a new generation's engineering reactor inner member large scale GH690 nickel-based high-temperature alloy forge piece is carried out heat treatment,
Diameter of forgings (D) be 360mm, highly (h) be 160mm, for solid forging, composition is shown in Table 2.Adopt
Using electrical heating annular furnace, the temperature control precision of electrical heating annular 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 heating rate of 55 DEG C/h, forging is heated to 1080 DEG C of insulations,
It is incubated 80 minutes；
3rd step, forging is come out of the stove and water-cooled is to room temperature；
4th step, continues heating by the forging of water-cooled to room temperature, is heated by forging with the peak power of heat-treatment furnace
To 480 DEG C of insulations, it is incubated 40 minutes；
5th step, continues to add hot forging, with the heating rate of 55 DEG C/h, forging is heated to 715 DEG C of insulations, protects
Temperature 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 is as shown in Figures 1 to 3.
Gained sample is carried out room temperature and 350 DEG C of mechanics properties testing (surveying two samples respectively), obtains room temperature
With 350 DEG C of intensity such as table 3.
After forging original grain state and heat treatment, forging heart portion crystalline form is the most as shown in Figure 4 and Figure 5.
Result shows, after heat treatment, large scale GH690 nickel-based high-temperature alloy forge piece avoids at conventional method heat
Crystal grain after reason is grown up, and maintains original state the most brilliant, and the more original state of grain size is more uniformly distributed, and is 6.0 grades.
Room temperature tensile intensity is up to more than 690MPa, and room-temperature yield strength is up to more than 310MPa, 350 DEG C of tensions
Intensity is up to more than 580MPa, and 350 DEG C of yield strengths are up to more than 255MPa, significantly larger than in nuclear power heap
The component mechanical property technical specification of large scale nickel-base alloy forging.
Embodiment 2
The heat treatment method of nuclear in-pile component large scale high-strength thin-crystal nickel-based high-temperature alloy forge piece of the present invention, uses
In a new generation's engineering reactor inner member large scale GH690 nickel-based high-temperature alloy forge piece is carried out heat treatment,
Diameter of forgings be (D) 380mm, highly (h) be 180mm, for solid forging, composition is shown in Table 2.Adopt
Using electrical heating annular furnace, the temperature control precision of electrical heating annular 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 heating rate of 50 DEG C/h, forging is heated to 1120 DEG C of insulations,
It is incubated 90 minutes；
3rd step, forging is come out of the stove and water-cooled is to room temperature；
4th step, continues heating by the forging of water-cooled to room temperature, is heated by forging with the peak power of heat-treatment furnace
To 500 DEG C of insulations, it is incubated 45 minutes；
5th step, continues to add hot forging, protects in the range of forging being heated to 720 DEG C with the heating rate of 50 DEG C/h
Temperature, 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 is as shown in Figures 1 to 3.
Gained sample is carried out room temperature and 350 DEG C of mechanics properties testing (surveying two samples respectively), obtains room temperature
With 350 DEG C of intensity such as table 3.
After forging original grain state and heat treatment, forging heart portion crystalline form is the most as shown in Figure 6 and Figure 7.
Result shows, after heat treatment, large scale GH690 nickel-based high-temperature alloy forge piece avoids conventional method
Crystal grain after heat treatment is grown up, and maintains original state the most brilliant, and the more original state of grain size is more uniformly distributed, and is 5.5
Level.Room temperature tensile intensity is up to more than 675MPa, and room-temperature yield strength is up to more than 300MPa, 350 DEG C
Tensile strength is up to more than 565MPa, and 350 DEG C of yield strengths are up to more than 245MPa, significantly larger than nuclear power
The in-pile component mechanical property technical specification of large scale nickel-base alloy forging.
The chemical composition (wt%) of table 2 embodiment of the present invention large scale high-strength thin-crystal GH690 nickel-base alloy forging
Mechanical property after table 3 embodiment of the present invention large scale high-strength thin-crystal GH690 nickel-base alloy forging heat treatment
Claims (4)
1. a nuclear power heap large scale high-strength thin-crystal nickel-based high-temperature alloy forge piece heat treatment method, for material
Material is GH690 nickel base superalloy, and diameter D is Φ 320～480mm, and highly h is 150～200mm
Solid forging carry out heat treatment；It is characterized in that, comprise the following steps:
(1) it is incubated in the range of forging being heated to 450～500 DEG C with the peak power of heat-treatment furnace, during insulation
Between be that every 1 millimeter of forging effective thickness is incubated 0.5～1.0 minute；
(2) continue to add hot forging, with the heating rate of 50～60 DEG C/h, forging is heated to 1000～1150 DEG C
In the range of be incubated, temperature retention time is that every 1 millimeter of forging effective thickness is incubated 1～1.5 minute；
(3) forging is come out of the stove and water-cooled is to room temperature；
(4) forging of water-cooled to room temperature is continued heating, with the peak power of heat-treatment furnace, forging is heated to
Being incubated in the range of 450～500 DEG C, temperature retention time is that every 1 millimeter of forging effective thickness is incubated 0.5～1.0 minute；
(5) continue to add hot forging, with the heating rate of 50～60 DEG C/h, forging is heated to 700～730 DEG C of models
Enclosing inside holding, temperature retention time is that every 1 millimeter of forging effective thickness is incubated 6.0～9.0 minutes；
(6) forging is come out of the stove and air cooling；
Described large scale high-strength thin-crystal nickel-based high-temperature alloy forge piece includes 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.
Heat treatment method the most according to claim 1, it is characterised in that described heat treatment uses electricity to add
Hot annular furnace；The temperature control precision of electrical heating annular furnace is ± 10 DEG C.
Heat treatment method the most according to claim 1, it is characterised in that the large scale nickel after heat treatment
The mechanical property of based high-temperature alloy forging is as follows:
Room temperature tensile intensity is 650～700MPa；Room-temperature yield strength is 280～320MPa；350 DEG C resist
Tensile strength is 550～600MPa；350 DEG C of yield strengths are 225～260MPa.
Heat treatment method the most according to claim 1, it is characterised in that the large scale nickel after heat treatment
The equal grain size of based high-temperature alloy forging is narrower than 5.5 grades.
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| US10563293B2 (en) * | 2015-12-07 | 2020-02-18 | Ati Properties Llc | Methods for processing nickel-base alloys |
| CN107419206A (en) * | 2017-08-12 | 2017-12-01 | 合肥市田源精铸有限公司 | A kind of heat treatment method of automotive safety part forging |
| 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 |
| CN111474968B (en) * | 2020-04-30 | 2021-09-07 | 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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| JP5107172B2 (en) * | 2008-08-06 | 2012-12-26 | 三菱マテリアル株式会社 | Ni-base alloy welding material |
| CN103820630B (en) * | 2012-11-19 | 2016-04-27 | 上海重型机器厂有限公司 | The nuclear in-pile component heat treating method of austenitic stainless steel cheese forging |
| CN103045875B (en) * | 2012-12-26 | 2014-08-06 | 中国科学院金属研究所 | Process method for producing 1 ton of I-690 alloy electroslag remelted ingot in industrialized mode |
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