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A kind of layered toughened ods steel and preparation method thereof

A toughening and layered technology, applied in the field of steel structure materials, can solve the problems of limited application and poor toughness, and achieve the effects of excellent corrosion resistance, improved strength and elongation at break, and improved strength and toughness.

Active Publication Date: 2016-06-29
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 biggest disadvantage of ODS steel is its poor toughness, and its DBTT (Ductile-Brittle Transition Temperature, referred to as ductile-brittle transition temperature) is about 100 times higher than that of RAFM (Reduced Activation Ferritic / Martensitic, referred to as low activation ferritic / martensitic steel) steel. ℃, which largely limits its application in engineering

Method used

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  • A kind of layered toughened ods steel and preparation method thereof
  • A kind of layered toughened ods steel and preparation method thereof

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Embodiment 1

[0029] This embodiment is used to prepare a layered toughened ODS steel, which includes alternately laminating a base layer and a toughened layer. The thickness of the base layer is about 150 μm and the thickness of the toughened layer is 30 μm. The base layer includes master powder, Ti, Y 2 O 3 And CrN, Ti content is 0.3% of the mass fraction of the base layer, Y 2 O 3 The content is 0.35% of the mass fraction of the base layer, and the content of CrN is 1% of the mass fraction of the base layer. The components contained in the master powder and the mass percentages of each component in the master powder are: 0.1% C, 9% Cr, 2.5% W, 0.25% V, 0.5% Mn, the balance Fe and impurity elements. The toughening layer is a 30μm metal tantalum sheet. Specific steps are as follows:

[0030] S1: The master powder, Ti powder, Y 2 O 3 After the powder and CrN powder are mixed, they are mechanically alloyed by high-energy ball milling under the protection of Ar gas to prepare matrix powder.

[00...

Embodiment 2

[0039] This embodiment is used to prepare a layered toughened ODS steel, which includes alternately laminating a base layer and a toughened layer. The thickness of the base layer is 180 μm and the thickness of the toughened layer is 30 μm. The base layer includes master powder, Ti, Y 2 O 3 And CrN, Ti content is 0.3% of the mass fraction of the base layer, Y 2 O 3 The content is 0.35% of the mass fraction of the base layer, and the content of CrN is 0.5% of the mass fraction of the base layer. The components contained in the master powder and the mass percentages of each component in the master powder are: 0.1% C, 9% Cr, 2.5% W, 0.25% V, 0.5% Mn, the balance Fe and impurity elements. The toughening layer is a 30μm metal tantalum sheet. Specific steps are as follows:

[0040] S1: Mix the master powder, Ti powder, Y 2 O 3 After the powder and CrN powder are mixed, they are mechanically alloyed by high-energy ball milling under the protection of Ar gas to prepare matrix powder.

[00...

Embodiment 3

[0048] This embodiment is used to prepare layered toughened ODS steel, which includes alternately laminating a base layer and a toughened layer. The thickness of the base layer is 200 μm and the thickness of the toughened layer is 30 μm. The base layer includes master powder, Ti, Y 2 O 3 And CrN, Ti content is 0.3% of the mass fraction of the base layer, Y 2 O 3 The content is 0.35% of the mass fraction of the base layer, and the content of CrN is 0.75% of the mass fraction of the base layer. The components contained in the master powder and the mass percentages of each component in the master powder are: 0.1% C, 9% Cr, 2.5% W, 0.25% V, 0.5% Mn, the balance Fe and impurity elements. The toughening layer is a 30μm metal tantalum sheet. Specific steps are as follows:

[0049] S1: Mix the master powder, Ti powder, Y 2 O 3 After the powder and CrN powder are mixed, they are mechanically alloyed by high-energy ball milling under the protection of Ar gas to prepare matrix powder.

[005...

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Abstract

The invention discloses a laminar toughened ODS steel and a preparation method thereof, belonging to the field of steel structure materials. The laminar toughened ODS steel comprises a base layer and a toughened layer alternatively overlapped with each other; the base layer comprises mother powder, Ti, Y2O3 and CrN; and the toughened layer comprises a tantalum sheet. The preparation method of the laminar toughened ODS steel disclosed by the invention comprises the following steps: S1, mixing mother powder, Ti, Y2O3 with CrN, and carrying out mechanical alloying under protection of inert gas; S2, alternatively overlapping base powder obtained in the step S1 with the tantalum sheet so as to obtain a body to be sintered; and S3, carrying out spark plasma sintering on the body to be sintered under protection of inert gas with the sintering temperature of 900-1100 DEG C and the sintering pressure of 90-100 Mpa. Compared with the typical ODS steel at home and abroad, the intensity of the laminar toughened ODS steel prepared by the invention can be increased by 125%; and the breakage elongation of the laminar toughened ODS steel can be increased by 16.8%.

Description

Technical field [0001] The invention belongs to the field of steel structure materials, and specifically relates to a layered toughened ODS steel and a preparation method thereof, and is particularly suitable for the clad structure of a fusion reactor. Background technique [0002] In a fusion reactor, the working environment of the cladding is very harsh, which not only requires the material to have good high temperature creep resistance, but also requires high radiation resistance. The working temperature of traditional low activation ferrite / martensitic steel can only reach 550~600℃, while Oxide DispersionStrengthened (ODS) steel can increase the working temperature to 700℃, which greatly improves the performance of fusion reactor. Energy conversion efficiency. [0003] The excellent performance of ODS steel is mainly attributed to a large number of small and stable oxides, such as Y 2 Ti 2 O 7 , Y 2 TiO 5 And (Ti,Y,O) nanoclusters, especially (Ti,Y,O) nanoclusters with a size ...

Claims

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Application Information

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IPC IPC(8): B32B15/01B32B37/06C22C33/02C22C38/28
CPCB32B15/04B32B33/00B32B37/06B32B2307/50C22C33/02C22C38/28
Inventor 索进平张颖刘大为周同王艳
Owner HUAZHONG UNIV OF SCI & TECH
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