Oxidation dispersion strengthened steel and preparation method thereof

A dispersion strengthening and oxide technology, applied in the field of alloys, can solve problems affecting the high temperature mechanical properties of oxide dispersion strengthening steel

Inactive Publication Date: 2018-11-06
TIANJIN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the actual preparation and production of oxide dispersion strengthened steel, Al elements are easy to form AlN, Al 2 o 3 and other mesophases, especially Al 2 o 3 Extremely easy and Y 2 o 3 Combined to form coarse Y-Al-O particles, which seriously affects the high temperature mechanical properties of oxide dispersion strengthened steel

Method used

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  • Oxidation dispersion strengthened steel and preparation method thereof
  • Oxidation dispersion strengthened steel and preparation method thereof
  • Oxidation dispersion strengthened steel and preparation method thereof

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preparation example Construction

[0040] The present invention also provides a preparation method for the oxide dispersion strengthened steel, comprising the following steps:

[0041] Fe-Cr-Al-W pre-alloyed powder, Y 2 o 3 Powder and Hf powder are mixed and ball milled to obtain pre-sintered powder;

[0042] The pre-sintered powder is sintered by hot isostatic pressing to obtain oxide dispersion strengthened steel.

[0043] In the present invention, Fe-Cr-Al-W pre-alloyed powder, Y 2 o 3Powder and Hf powder are mixed and ball milled to obtain pre-sintered powder. In the present invention, the particle size of the Fe-Cr-Al-W pre-alloyed powder is preferably 30-100 μm, more preferably 40-80 μm, most preferably 50-60 μm. In the present invention, when the particle size of the Fe-Cr-Al-W pre-alloyed powder raw material meets the above requirements, the present invention preferably uses the Fe-Cr-Al-W pre-alloyed powder directly; when the Fe - When the particle size of the Cr-Al-W pre-alloyed powder raw mater...

Embodiment 1

[0070] Weigh 149.025g of Fe-16wt%Cr-3wt%Al-1.5wt%W pre-alloyed powder with a particle size of 60μm, and 0.525g of Y with a particle size of 40nm 2 o 3 Put the particles and 0.75g of elemental Hf powder with a particle size of 10 μm into a 2000mL ball mill; then put 1500g of stainless steel balls into the ball mill respectively as the ball milling medium, wherein the weight ratio of steel balls with a diameter of 6mm and 10mm is 4:1;

[0071] Fill the ball mill jar with alloy raw materials and stainless steel balls with argon in a glove box and seal them, so that the ball milling process is carried out in an argon environment. The ball milling speed is 250r / min, and the ball milling time is 30h. During the ball milling process, every 8 hours of ball milling, stop for 40 minutes, repeat this way, the stop time is not included in the ball milling time. After ball milling, pre-sintered material is obtained;

[0072] Put the pre-sintered material into the stainless steel sheath,...

Embodiment 2

[0075] Weigh 149.025g of Fe-16wt%Cr-3wt%Al-1.5wt%W pre-alloyed powder with a particle size of 60μm, and 0.525g of Y with a particle size of 40nm 2 o 3 Put the particles and 0.75g of elemental Hf powder with a particle size of 10 μm into a 2000mL ball mill; then put 1500g of stainless steel balls into the ball mill respectively as the ball milling medium, wherein the weight ratio of steel balls with a diameter of 6mm and 10mm is 4:1;

[0076] Fill the ball mill jar with alloy raw materials and stainless steel balls with argon in a glove box and seal them, so that the ball milling process is carried out in an argon environment. The ball milling speed is 300r / min, and the ball milling time is 30h. During the ball milling process, every 8 hours of ball milling, stop for 40 minutes, repeat this way, the stop time is not included in the ball milling time. After ball milling, pre-sintered material is obtained;

[0077] Put the pre-sintered material into the stainless steel sheath,...

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Abstract

The invention provides oxidation dispersion strengthened steel comprising the following components of, by mass, 15%-17% of Cr, 2%-4% of Al, 1%-2% of W, 0.3%-1.0% of Y2O3, 0.3%-0.8% of Hf, and the balance Fe. According to records of the embodiment, oxide in the 16 Cr-oxidation dispersion strengthened (ODS) steel is refined effectively with the Hf element, and the oxide in the ODS steel provided bythe invention has better size stability and tensile strength performance in a high temperature environment.

Description

technical field [0001] The invention relates to the technical field of alloys, in particular to an oxide dispersion strengthened steel and a preparation method thereof. Background technique [0002] Oxidation Dispersion Strengthened Steels (ODS steel) has a certain amount of nano-oxide particles in the matrix, which can hinder dislocation movement and grain growth through the dispersion strengthening of oxide particles during service. Large, compared with traditional heat-resistant steel, oxide dispersion strengthened steel has good high temperature performance and radiation damage resistance. Therefore, oxide dispersion strengthened steel is selected as one of the candidate structural materials for the fourth generation nuclear fission reactor. [0003] In the preparation process of oxide dispersion strengthened steel, some additives are generally added to improve the comprehensive performance of oxide dispersion strengthened steel. Among them, Al element can form dense a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/22C22C38/06C22C33/02B22F9/04B22F3/15
CPCC22C38/22B22F3/15B22F9/04B22F2998/10C22C32/0026C22C33/0207C22C33/0285C22C38/002C22C38/06
Inventor 余黎明闫佩云刘永长李会军刘晨曦李冲马宗青
Owner TIANJIN UNIV
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