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Novel dispersion-strengthened low-activation radiation-resistant martensitic steel and heat treatment technology thereof

A technology of martensitic steel and elements, applied in the field of martensitic steel and its preparation, can solve the problems of small output, poor stability, small size, etc.

Inactive Publication Date: 2017-09-05
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

However, due to the limitations of the preparation process and technology, the ODS steel prepared by this method has small single-batch yield, poor stability between batches, and small size, so it cannot quickly enter the stage of industrial application.

Method used

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  • Novel dispersion-strengthened low-activation radiation-resistant martensitic steel and heat treatment technology thereof
  • Novel dispersion-strengthened low-activation radiation-resistant martensitic steel and heat treatment technology thereof
  • Novel dispersion-strengthened low-activation radiation-resistant martensitic steel and heat treatment technology thereof

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preparation example Construction

[0048] The application also provides a method for preparing the above-mentioned martensitic steel, comprising the following steps:

[0049] A), forging the martensitic steel ingot, the element composition of the martensitic steel ingot is as shown in the above scheme;

[0050] B), the forged martensitic steel ingot is rolled, the rolled martensitic steel is quenched and tempered once, and the martensitic steel ingot after the first tempering is tempered twice .

[0051] In the process of preparing martensitic steel, the applicant first prepared a martensitic steel ingot; the preparation of the martensitic steel ingot was prepared according to technical means well known to those skilled in the art, and this application has no special For example, the preparation of the martensitic steel ingot can be carried out by vacuum induction melting first, and then vacuum consumable arc melting; in the process of vacuum induction melting, the easily oxidizable alloying elements are added...

Embodiment 1

[0060] (1) In terms of mass percentage, according to the composition ratio: Cr 8.5%, W 1.5%, V 0.16%, Ta 0.20%, Mn0.45%, C 0.08%, N 0.02%, Zr 0.005% ~ 0.015%, Si <0.01%, P≤0.005%, S≤0.005%, O≤0.005%, Al≤0.01%, Ni≤0.005%, Nb≤0.001%, Co≤0.005%, Cu≤0.005%, Mo≤0.005% and alloy The burning loss proportioning raw material, wherein C, N, Ta and V satisfy the relational expression of formula (1);

[0061] (2) In the vacuum induction furnace, raw materials are added sequentially according to the burning loss and volatilization characteristics of the alloying elements. The easily oxidized alloying elements are added after they are fully deoxidized, and the volatile alloying elements are added under the protection of the atmosphere or at the end of the smelting process. Ingots with qualified components are prepared after induction melting;

[0062] (3) Melting the prepared ingot by vacuum consumable arc to further purify the material;

[0063] (4) Forging the ingot obtained in step (3)...

Embodiment 2

[0068] (1) In terms of mass percentage, according to the composition ratio: Cr 9.0%, W 1.5%, V 0.11%, Ta 0.25%, Mn0.45%, C 0.08%, N 0.03%, Zr 0.005% ~ 0.015%, Si <0.01%, P≤0.005%, S≤0.005%, O≤0.005%, Al≤0.01%, Ni≤0.005%, Nb≤0.001%, Co≤0.005%, Cu≤0.005%, Mo≤0.005% and alloy The burning loss proportioning raw material, wherein C, N, Ta and V satisfy the relational expression of formula (1);

[0069] (2) In the vacuum induction furnace, add the above-mentioned raw materials in sequence according to the burning loss and volatilization characteristics of the alloy elements. The easy-to-oxidize alloy elements are added after they are fully deoxidized, and the volatile alloy elements are added under the protection of the atmosphere or at the end of the melting process. Ingots with qualified components are prepared after induction melting;

[0070] (3) Melting the prepared ingot by vacuum consumable arc to further purify the material;

[0071] (4) Forging the ingot obtained in step ...

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Abstract

The invention provides a martensitic steel whose main elements include: 8.0-8.8wt% Cr, 1.3-1.7wt% W, 0.15-0.25wt% V, 0.15-0.25wt% Ta, 0.30- 0.70wt% Mn, 0.06-0.10wt% C, 0.02-0.06wt% N, 0.005-0.015wt% Zr; this application reduces Cr content and adds N element to partially replace C element, so that the material can be processed During the process, the precipitation of M23C6 is reduced; and by strictly controlling the composition ratio of each forming element of the MX phase, it is ensured that Ta and V are precipitated in the form of MX phase to the greatest extent. At the same time, the application adopts a special heat treatment process to obtain dispersed and fine MX phases, effectively improving the high-temperature performance of the material during service.

Description

technical field [0001] The invention relates to the technical field of metal materials, in particular to martensitic steel and a preparation method thereof. Background technique [0002] As a "clean" energy source, nuclear fusion energy requires that the structural materials used in fusion reactors be low-activation materials. Potential radioactive hazards caused by activation, reducing reprocessing of radioactive nuclear waste and its cost. A lot of research has been done on low-activation steel materials for fusion reactors at home and abroad, mainly focusing on low-activation ferrite / martensitic (RAFM) steels, such as Eurofer steel in Europe, F82H steel in Japan, and CLAM steel in China. . However, due to the limitation of high-temperature softening of low-activation martensitic steel, its upper limit use temperature is only about 550°C, which restricts the use temperature of this material in fusion reactors. Increasing the upper limit of the operating temperature of l...

Claims

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Application Information

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IPC IPC(8): C22C38/22C22C38/24C22C38/26C22C38/28C22C38/04C22C38/02C22C38/06C22C38/30C22C38/20C22C38/44C22C38/46C22C38/48C22C38/50C22C38/52C22C38/42C21D1/18C21D8/00
CPCC22C38/22C21D1/18C21D8/005C21D2211/008C22C38/001C22C38/02C22C38/04C22C38/06C22C38/20C22C38/24C22C38/26C22C38/28C22C38/30C22C38/42C22C38/44C22C38/46C22C38/48C22C38/50C22C38/52
Inventor 吴宜灿黄群英徐刚王伟刘少军毛小东
Owner HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
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