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Method for increasing high-temperature strength and antioxidant property of reduced activation ferritic/martensitic steel

A low-activation ferrite, oxidation resistance technology, applied in the field of improving high-temperature strength and oxidation resistance of low-activation ferrite/martensitic steel, can solve the problem of high-temperature strength and oxidation resistance of low-activation ferrite/martensitic steel Oxidation resistance can not be taken into account and other issues, to achieve the effect of rapid formation, high temperature strength and plasticity, good oxidation resistance

Active Publication Date: 2016-07-06
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In order to solve the problem that the high-temperature strength and oxidation resistance of the existing low-activation ferrite / martensitic steel cannot be balanced, the purpose of the present invention is to provide a method for improving the high-temperature strength and high-temperature oxidation resistance of the low-activation ferrite / martensitic steel performance method, which achieves synergistic control of grain size and carbides through rotary forging deformation and annealing treatment, and significantly improves the high temperature strength and oxidation resistance of low-activation ferritic / martensitic steels

Method used

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  • Method for increasing high-temperature strength and antioxidant property of reduced activation ferritic/martensitic steel
  • Method for increasing high-temperature strength and antioxidant property of reduced activation ferritic/martensitic steel
  • Method for increasing high-temperature strength and antioxidant property of reduced activation ferritic/martensitic steel

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Embodiment 1

[0029] 1) Melting and thermal processing: 9Cr2WVTa low-activation ferrite / martensitic steel is smelted in a vacuum induction furnace, and the content of impurity elements is strictly controlled. The specific chemical composition (wt.%): C: 0.11%, Cr: 8.86%, W : 1.62%, V: 0.24%, Ta: 0.11%, Mn: 0.45%, Si: 0.05%, S: 0.005%, P: 0.005%, and the balance is Fe. Forging the ingot at 1100°C for 2 hours, the blank forging temperature is 1100°C, and the final forging temperature is above 900°C to obtain a forged plate with a thickness of 30mm;

[0030] 2) Heat treatment: heat the forged alloy in step 1) at 1050°C for 60 minutes, then water-cool; then hold at 750°C for 2 hours, then air-cool;

[0031] 3) Rotary forging deformation: the heat-treated alloy in step 2) is subjected to controllable deformation treatment in separate passes on a precision rotary forging machine. %, cumulative deformation 94%;

[0032] 4) Annealing treatment: heat the deformed alloy in step 3) at 700° C. for 20...

Embodiment 2

[0039] A method for improving high-temperature strength and oxidation resistance of low-activation ferrite / martensitic steel. The main difference from Example 1 is that alloys with different components and process parameters for rotary forging deformation are selected. The specific process steps are as follows:

[0040] 1) Melting and thermal processing: Vacuum induction furnace is used to melt 9Cr2WVTa low-activation ferrite / martensitic steel, and the content of impurity elements is strictly controlled. The specific chemical composition (wt.%): C: 0.13%, Cr: 8.70%, W : 1.74%, V: 0.25%, Ta: 0.10%, Mn: 0.47%, Si: 0.04%, S: 0.006%, P: 0.006%, and the balance is Fe. Forging the ingot at 1100°C for 2 hours, the blank forging temperature is 1100°C, and the final forging temperature is above 900°C to obtain a forged plate with a thickness of 30mm;

[0041] 2) Heat treatment: heat the forged alloy in step 1) at 1050°C for 60 minutes, then water-cool; then hold at 750°C for 2 hours, t...

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Abstract

The invention discloses a method for increasing the high-temperature strength and the antioxidant property of reduced activation ferritic / martensitic steel, which belongs to the technical field of reduced activation ferritic / martensitic steel preparation. Rotary forging deformation and annealing treatment are performed on the reduced activation ferritic / martensitic steel in a conventional heat treatment state, so that cooperative control over grain size and carbide is realized; the quick forming of an oxidation film and the binding force with a substrate are promoted by refining the grain size, so that the high-temperature oxidation resistant property of a material is increased; additionally, the size of the carbide is refined, and the dispersion distribution of the carbide is increased, so that the stability of a fine-grained structure is guaranteed, and the high-temperature mechanical property is increased. According to the reduced activation ferritic / martensitic steel prepared by adopting the method, the thermophysical property and the irradiation resistant property are satisfied, the high-temperature strength and the antioxidant property are synchronously increased, and novel high-performance reduced activation ferritic / martensitic steel can be prepared for a nuclear power industry.

Description

technical field [0001] The invention relates to the technical field of preparation of low-activation ferrite / martensitic steel, in particular to a method for improving the high-temperature strength and oxidation resistance of low-activation ferrite / martensitic steel. Background technique [0002] Low-activation ferrite / martensitic steel (RAFM) has the advantages of low thermal expansion coefficient, high thermal conductivity, good radiation resistance and mature technical foundation, and is generally considered to be the next generation of nuclear reactors and fusion reactors. main candidate materials. The main alloy composition of this type of steel is Fe (9-12wt.%) Cr, which is developed by replacing highly active Mo, Nb, Ni and other elements in heat-resistant steel with low-activity W, V, Ta and other elements. The service environment of low-activation ferrite / martensitic steel is high temperature environment, the temperature is 300-600 °C, and the material is required ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D8/00
CPCC21D8/005C21D2211/005C21D2211/008C22C38/02C22C38/04C22C38/12C22C38/18
Inventor 陈胜虎戎利建闫德胜姜海昌赵明久王本贤胡小锋宋元元韩仲景
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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