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Preparation method of anti-irradiation low activation steel strengthened by nano-precipitation phase

A nano-precipitated phase and low-activation steel technology, which is applied in the manufacture of tools, metal rolling, heat treatment equipment, etc., can solve the problems of reducing the low activation characteristics of materials, and achieve high-temperature service structural stability, creep rupture life, and The effect of increasing resistance

Active Publication Date: 2019-04-09
HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, the smelting of RAFM steel usually adopts vacuum smelting plus Al or Ce deoxidation to control the oxidation and burning loss of Ta elements. However, Al and Ce are easily activated elements and will remain in the molten steel, resulting in the occurrence of easily activated impurity elements in RAFM steel. increase and decrease the low activation characteristics of the material

Method used

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  • Preparation method of anti-irradiation low activation steel strengthened by nano-precipitation phase

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Example 1: Preparation of a 50-kilogram-scale nano-precipitated phase-strengthened radiation-resistant low-activation steel

[0029] The composition and mass percentage of the steel are: Cr 9.0wt%, W 1.5wt%, Mn 0.55wt%, Ta 0.15wt%, V 0.2wt%, C 0.10wt%, and the rest is Fe.

[0030] (1) Preparation of FeTaC master alloy: Add 9.85kg of iron block with a purity greater than 99.9% in the vacuum induction furnace 1, after vacuuming to 0.01Pa, fill with high-purity argon to 0.05MPa, heat up to 1550°C to melt pure iron, and Add 0.5wt% carbon powder to the melted pure iron to carry out vacuum carbon deoxidation treatment. When the O content in the melted pure iron is 3ppm, add 0.1kg Ta metal, heat it for 1h and leave the furnace to prepare a Ta content of 1wt%. FeTaC master alloy, the content of other unavoidable impurity elements is less than 5ppm. (When preparing the FeTaC master alloy, the composition is added according to Fe 98.5%, Ta 1%, and C 0.5%, but in the preparation ...

Embodiment 2

[0040] Example 2: Preparation of a 50-kilogram-scale nano-precipitated phase-strengthened radiation-resistant low-activation steel

[0041] The composition and mass percentage of the steel are: Cr 9.0wt%, W 1.5wt%, Mn 0.55wt%, Ta 0.15wt%, V 0.2wt%, C 0.10wt%, and the rest is Fe.

[0042] (1) Preparation of FeTaC master alloy: Add 1.9kg of iron block with a purity greater than 99.9% in the vacuum induction furnace 1, after vacuuming to 0.1Pa, fill with high-purity argon to 0.08MPa, heat up to 1600°C to melt pure iron, and Add 0.04kg of carbon powder to the melted pure iron to carry out vacuum carbon deoxidation treatment. When the O content in the melted pure iron is 3ppm, add 0.1kg of Ta metal, keep warm for 2h, and leave the furnace to prepare a Ta content of 5wt%. FeTaC master alloy, the content of other unavoidable impurity elements is less than 5ppm.

[0043] (2) Melting process: after vacuuming the vacuum induction furnace 2 to 1Pa, fill it with high-purity argon to 0.01...

Embodiment 3

[0052] Example 3: Preparation of a 50-kilogram-scale nano-precipitated phase-strengthened radiation-resistant low-activation steel

[0053] The composition and mass percentage of the steel are: Cr 9.0wt%, W 1.5wt%, Mn 0.55wt%, Ta 0.15wt%, V 0.2wt%, C 0.10wt%, and the rest is Fe.

[0054] (1) Preparation of FeTaC master alloy: Add 3.9kg of iron block with a purity greater than 99.9% in the vacuum induction furnace 1, after vacuuming to 0.05Pa, fill with high-purity argon to 0.06MPa, heat up to 1580°C to melt pure iron, and Add 0.04kg of carbon powder to the melted pure iron for vacuum carbon deoxidation treatment. When the O content in the melted pure iron is 3ppm, add 0.1kg of Ta metal, heat it for 1.5h, and then release it from the furnace to prepare a Ta content of 2.5wt. % FeTaC master alloy 4kg, other unavoidable impurity element content is less than 5ppm.

[0055] (2) Melting process: After the vacuum induction furnace is evacuated to 0.5Pa, it is filled with high-purity...

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Abstract

The invention relates to a preparation method of anti-irradiation low activation steel strengthened by a nano-precipitation phase, and belongs to the technical field of nuclear power steel. The methodcomprises the following steps of: firstly preparing a FeTaC intermediate alloy, and then preparing and obtaining the steel by a smelting process, a forging process, a rolling process and a heat treatment process sequentially. In the invention, a pure metal Ta is replaced by preparing the FeTaC intermediate alloy so as to avoid the burning loss of the steel caused by the high oxidation activity ofthe Ta metal during the smelting process; the burning loss of the Ta element is suppressed by the high temperature carbon deoxidation technology during the smelting process, and the Ta yield and reach more than 90%; the ultra-fine martensitic steel with excellent high-temperature creep performance and anti-neutron irradiation performance is obtained by optimizing the rolling process and promotingthe high-density uniform dispersion of the nano-precipitation phase to produce strengthening and refining grain action. The creep duration of the anti-irradiation low activation steel under the loading condition of 550 DEG C and 195MPa exceeds 5,000h.

Description

technical field [0001] The invention belongs to the technical field of steel for nuclear power, and in particular relates to a method for preparing anti-irradiation low-activation steel strengthened by nano-precipitation phases. Background technique [0002] Nuclear power is an important part of the power industry, and improving the safety and economy of nuclear power has always been a key issue in the development of nuclear power. The lead-based fast neutron reactor is evaluated by the "Generation IV Nuclear Energy System International Forum (GIF)" organization as the first fourth-generation reactor that is expected to realize industrial demonstration and commercial application, and the fusion reactor is the nuclear energy system that will finally solve the energy crisis of mankind. Structural materials are one of the key factors for lead-based fast neutron reactors and fusion reactors to be applied in engineering applications. However, the operating environments of lead-ba...

Claims

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Application Information

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IPC IPC(8): C22C35/00C22C33/06C21C7/10C21C7/06C21D1/26C21D1/18B21J1/04B21B1/26
CPCC21C7/06C21C7/10C21D1/18C21D1/26C22C33/06C22C35/005B21B1/26B21J1/04C22C38/22C22C38/04C22C38/24C22C38/26C22C33/04C21C7/0006C21D1/25C21D8/0247C21D8/0221C21D8/0226C21D9/46C21D8/0263C21D2211/008C21D6/02C21D6/002
Inventor 赵彦云黄群英刘少军毛小东黄波吴宜灿
Owner HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
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