Zirconium-reinforced low-activation martensitic steel and preparation method thereof

A martensitic steel, low activation technology, applied in the field of metal materials, can solve the problems of pollution, easy oxidation of powder, deterioration of mechanical properties of experimental steel, etc. Effect

Active Publication Date: 2020-08-11
XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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  • Abstract
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  • Claims
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Problems solved by technology

Among them, ODS (Oxide Dispersion Strengthened) steel prepared by powder metallurgy (mechanical alloying) process has the best performance, but ODS steel also has some non-negligible defects.
During the mechanical alloying process, the powder is easily oxidized and polluted, and the reproducibility of the product is poor due to the complicated preparation process
A nuclear fusion demonstration reactor needs to use about 3,500 tons of low-activation materials. Due to the lack of large-scale production equipment, it is difficult to produce such a large-scale ODS steel by powder metallurgy. This shortcoming has also become a fatal flaw of ODS steel.
Composition-improved RAFM steel does not solve the problem of pure smelting of RAFM steel, and there are some large-sized inclusions in the steel, which deteriorate the mechanical properties of the experimental steel

Method used

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  • Zirconium-reinforced low-activation martensitic steel and preparation method thereof
  • Zirconium-reinforced low-activation martensitic steel and preparation method thereof
  • Zirconium-reinforced low-activation martensitic steel and preparation method thereof

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preparation example Construction

[0038] The preparation of zirconium reinforced low activation martensitic steel of the present invention comprises the following steps:

[0039] (1) Preparation of zirconium oxide strengthening phase

[0040] The raw materials Fe, Cr and W are loaded into a vacuum induction furnace, and the alloy material is melted under vacuum; the oxygen mass fraction (Xo 2 ) for measurement; according to the measurement results, add C to the steel for deoxidation, so that the oxygen in the alloy liquid can be removed to 100-180ppm; ; After all the alloys are melted, cast under nitrogen protection to obtain ingots containing zirconium oxide strengthening phase, and the nitrogen pressure in the furnace is controlled at 1000-2000Pa;

[0041] In this step, the purpose of measuring the oxygen mass fraction in molten steel is to estimate how much oxygen needs to be removed, and carbon deoxidation is used because C+O 2 =CO 2 generated CO 2 The gas can be released directly without polluting the...

Embodiment 1

[0052] In this embodiment, the smelting of 100 kg of zirconium-strengthened low-activation martensitic steel is taken as an example for illustration. The chemical components and the mass percentages of each component in the zirconium-strengthened low-activation martensitic steel are as follows:

[0053] C: 0.01%, Si: 0.03%, Mn: 0.5%, Cr: 8.0%, W: 1.0%, V: 0.2%, Zr: 0.01%, N: 0.02%, O: 0.0125%, and the rest is Fe.

[0054] The preparation of zirconium reinforced low activation martensitic steel in this embodiment comprises the following steps:

[0055] (1) Preparation of zirconium oxide strengthening phase

[0056] The raw materials Fe, Cr and W are loaded into a vacuum induction furnace, and the alloy material is melted under vacuum; the oxygen mass fraction (Xo 2 ) for measurement, the oxygen mass fraction in the alloy liquid (Xo 2 ) is 400ppm; the vacuum degree is controlled at 5-10Pa, and 0.0102kg C is added to the steel for deoxidation, so that the oxygen in the alloy li...

Embodiment 2

[0063] In this embodiment, the smelting of 100 kg of zirconium-strengthened low-activation martensitic steel is taken as an example for illustration. The chemical components and the mass percentages of each component in the zirconium-strengthened low-activation martensitic steel are as follows:

[0064] C: 0.02%, Si: 0.05%, Mn: 0.4%, Cr: 9.0%, W: 1.2%, V: 0.25%, Zr: 0.02%, N: 0.01%, O: 0.0150%, and the rest is Fe.

[0065] The preparation of zirconium reinforced low activation martensitic steel in this embodiment comprises the following steps:

[0066] (1) Preparation of zirconium oxide strengthening phase

[0067] The raw materials Fe, Cr and W are loaded into a vacuum induction furnace, and the alloy material is melted under vacuum; the oxygen mass fraction (Xo 2 ) for measurement, the oxygen mass fraction in the alloy liquid (Xo 2 ) is 420ppm; the vacuum degree is controlled at 5-10Pa, and 0.010kgC is added to the steel for deoxidation, so that the oxygen in the alloy liqui...

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Abstract

The invention discloses zirconium-reinforced low-activation martensitic steel and a preparation method thereof. The zirconium-reinforced low-activation martensitic steel comprises, by mass, 0.01%-0.02% of C, 0.01%-0.05% of Si, 0.3%-0.5% of Mn, 8.0%-9.0% of Cr, 1.0%-1.5% of W, 0.2%-0.3% of V, 0.01%-0.03% of Zr, 0.01%-0.02% of N, 0.01%-0.02% of O, and the balance Fe. During preparation, Fe, Cr and Ware melted in a vacuum induction furnace; then, C is added for deoxidization; then, Zr, Mn, Si, V and C are added in sequence, and after all alloys are melted down, casting is performed under nitrogen protection to obtain a cast ingot; the cast ingot is subjected to component uniformity adjustment and then machined into a rolling billet; and the rolling billet is rolled, slow cooling is performedafter rolling is completed, and then quenching and tempering are performed to obtain the zirconium-reinforced low-activation martensitic steel. According to the method, by adding zirconium instead ofTa for reinforcement, an oxide zirconium reinforcing phase and nano-scale zirconium carbide can be formed, and the use performance of the steel is improved.

Description

technical field [0001] The invention belongs to the technical field of metal materials, in particular to a zirconium-strengthened low-activation martensitic steel and a preparation method thereof. Background technique [0002] Low activation ferrite / martensitic steel (Reduced Activation Ferritic / Martensitic, RAFM) is one of the main candidate materials for cladding structure materials of nuclear fusion reactors. Requirements for Engineering Experimental Reactor (CFETR) Phase II and future fusion reactors. At present, the main solutions are as follows: one is to add nano oxide dispersed phase to improve the high temperature mechanical properties of RAFM steel; the other is to optimize the experimental steel composition and heat treatment process to precipitate high melting point carbides in the steel to improve the comprehensive mechanical properties of RAFM steel. Among them, ODS (Oxide Dispersion Strengthened) steel prepared by powder metallurgy (mechanical alloying) proce...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/28C22C38/24C22C38/22C22C38/04C22C38/02C22C33/04C21C7/06B22D1/00C21D1/18C22B9/16C21D8/02
CPCB22D1/002C21C7/06C21D1/18C21D8/0205C21D8/0247C21D2211/004C21D2211/008C22B9/16C22C33/04C22C38/001C22C38/02C22C38/04C22C38/22C22C38/24C22C38/28Y02P10/25
Inventor 邱国兴刘诗薇
Owner XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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