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N-ODS steel for fusion reactor and preparation method thereof

A fusion reactor and electroslag remelting technology, which is applied in the direction of manufacturing tools, heat treatment equipment, furnaces, etc., can solve the problems of severe segregation, achieve the effects of controlling burning loss, solving high brittleness, and controlling growth

Active Publication Date: 2022-01-14
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the Y-containing oxide particles produced by this method are still micron-sized, and the segregation is relatively serious.

Method used

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  • N-ODS steel for fusion reactor and preparation method thereof
  • N-ODS steel for fusion reactor and preparation method thereof
  • N-ODS steel for fusion reactor and preparation method thereof

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preparation example Construction

[0031] see figure 1 , figure 2 and image 3 , a kind of preparation method of fusion reactor N-ODS steel provided by the invention mainly comprises the following steps:

[0032] Step 1, preparing a consumable electrode.

[0033] Specifically, the vacuum induction melting (VIM) process was used to optimize the composition of ultra-clean low-activation martensitic (SCRAM) steel, and it was used as the consumable electrode of the electroslag remelting process. Among them, the target element is used as the carrier, and the target elements such as Y, Ti and N are simultaneously introduced in the process, and the introduction of O element and the formation and segregation of oxides are avoided.

[0034] In the process of vacuum induction melting, the vacuum degree is controlled to 0.6Pa, the power transmission power is 220kW until the material is completely melted, and then the slag is discharged and the secondary refining is carried out after smelting at 280kW power for 5 minutes...

Embodiment 1

[0046] The batch preparation method of Y-Ti-O nano-oxide reinforced N-ODS steel provided in Example 1 of the present invention mainly includes the following steps:

[0047] (1) Using vacuum induction melting process, Fe-Cr-W base alloy powder, Mn powder, ferrosilicon, ferrosilicon powder, TiN, TiC and YN ceramic powder are used as raw materials, and Fe-9%Cr-3 %W-1%Mn-0.35%Si-0.25%V-0.25%Ti-0.35%Y-0.1%N by mass percent to produce SCRAM steel consumable electrodes.

[0048] (2) The slag system used in the electroslag remelting process includes the following chemical components in mass percentage: 73% CaF 2 -10%CaO-10%Al 2 o 3 -7%TiO 2 , reduce the content in the slag system to reduce the Al content in N-ODS steel, because Ti and Al elements compete for deoxidation, so the matrix mainly precipitates Y-Ti-O nano-oxides, further refines the size of the precipitated phase, and improves The strength of N-ODS steel, the tensile strength of N-ODS steel prepared by this method can r...

Embodiment 2

[0050] The industrial preparation method of the nitride-wrapped Y-Al-O composite strengthened N-ODS steel provided in Example 2 of the present invention mainly includes the following steps:

[0051] (1) Using vacuum induction melting process, Fe-Cr-W base alloy powder, Mn powder, ferrosilicon, vanadium iron powder, TiN, YN ceramic powder are used as raw materials, and according to Fe-9%Cr-3%W- The elemental mass percentage of 1%Mn-0.35%Si-0.25%V-0.25%Ti-0.35%Y-0.2%N produces SCRAM steel consumable electrodes with high N content.

[0052] (2) The slag system used in the electroslag remelting process includes the following chemical composition in mass percentage: 70% CaF 2 , 30%Al 2 o 3 and 10%TiO 2 , Improve the oxidation of slag system. In the matrix, nano-oxides of Y-Al-O are mainly precipitated, while Ti and V elements are combined with high content of N elements to form (Ti, V)N. In the process of cooling the ingot in the electroslag remelting metal bath, the flow rate...

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Abstract

The invention belongs to the related field of design and preparation of steel and iron materials, and discloses N-ODS steel for a fusion reactor and a preparation method thereof. The method comprises the following steps that (1), SCRAM steel is subjected to component optimization through a vacuum induction melting technology and then serves as a consumable electrode for electroslag remelting; meanwhile, oxidizing components are added into a slag system to obtain an oxidized slag system; (2) the oxidized slag system is preheated to serve as the slag system for electroslag remelting, and then electroslag remelting is conducted to obtain electroslag remelting N-ODS steel; and (3) the heat treatment is conducted on the obtained electroslag remelting N-ODS steel by adopting a two-time quenching and tempering process, an intermediate furnace cooling process is set to separate out a nitrogen-carbon compound with an MX phase, so as to obtain the N-ODS steel jointly reinforced by the MX phase and the oxide. The high-temperature mechanical property and the anti-irradiation property of the N-ODS steel are greatly improved.

Description

technical field [0001] The invention belongs to the technical field related to the design and preparation of iron and steel materials, and more specifically relates to an N-ODS steel for fusion reactors and a preparation method thereof. Background technique [0002] Clean, efficient and abundant nuclear fusion energy is considered to be an important way to solve energy problems once and for all. With the development of fourth-generation reactors and fusion reactors, the research and development of cladding structural materials with excellent service performance has become a constraint for advanced nuclear energy projects. One of the bottlenecks of the application. In the design of nuclear fusion reactors, cladding structural materials need to withstand continuous high-temperature thermal shock and neutron irradiation, and at the same time face the problem of high-flux tritium penetration during the reaction process. In order to ensure the normal progress of the fusion react...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C33/04C22B9/18C22C38/22C22C38/02C22C38/04C22C38/38C22C38/24C22C38/28C21D6/00C21D9/00
CPCC22C33/04C22B9/18C22C32/0026C22C38/22C22C38/02C22C38/04C22C38/38C22C38/24C22C38/28C22C38/005C22C38/001C21D6/002C21D6/008C21D6/005C21D9/0068Y02P10/25
Inventor 索进平许晨光卢辉蔡基利许高永
Owner HUAZHONG UNIV OF SCI & TECH
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