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High-strength aluminum-containing ferrite ODS steel and preparation method thereof

An aluminum ferrite, high-strength technology, applied in the field of composition design of new high-strength corrosion-resistant aluminum-containing ferrite ODS steel, can solve problems such as unfavorable mechanical properties

Active Publication Date: 2018-07-27
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, Al is an element with relatively high activity, and it is easy to combine with Y and O to form larger-sized Y-Al-O nanoparticles, which is not good for mechanical properties.

Method used

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  • High-strength aluminum-containing ferrite ODS steel and preparation method thereof
  • High-strength aluminum-containing ferrite ODS steel and preparation method thereof
  • High-strength aluminum-containing ferrite ODS steel and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] First, the pre-alloyed powder (prepared by Tianjin Zhujin Science and Technology Development Co., Ltd.) whose composition is Fe-16wt%Cr-3wt%Al-1.5wt%W is prepared by gas atomization method, and 4 parts of pre-alloyed powder with a weight of 148.725g are weighed. Alloy powder is put into four 2000ml ball mill jars respectively. Then respectively add 0.525g (0.35wt%) particle diameter in 4 ball mill jars and be the Y of 40nm 2 o 3 Particles and 0.75g (0.5wt%) average diameter of 10 μm elemental Hf powder (Fe, Cr, Al, W, Y 2 o 3 The sum of Hf and Hf is the mass percent (100wt%). Then put 1500g stainless steel balls into 4 ball milling pots as the ball milling medium (ball-to-material ratio 10:1), wherein the weight ratio of steel balls with a diameter of 6mm and 10mm is 4:1. Then the ball milling tank with steel balls and powders was filled with argon in the glove box and sealed, so that the ball milling process was carried out under the environment of argon. The ball...

Embodiment 2

[0039] First prepare the pre-alloyed powder (prepared by Tianjin Zhujin Science and Technology Development Co., Ltd.) of Fe-22wt%Cr-1wt%Al-3wt%W with gas atomization method, and take 4 parts of pre-alloyed powder with a weight of 148.725g The powder is put into four 2000ml ball mill jars respectively. Then add 3wt% particle diameter to 4 ball mill jars respectively and be the Y of 40nm 2 o 3 Particles and 0.3wt% average diameter of 10 μm elemental Hf powder (Fe, Cr, Al, W, Y 2 o 3 The sum of Hf and Hf is the mass percent (100wt%). Then put 1500g stainless steel balls into 4 ball milling pots as the ball milling medium (ball-to-material ratio 10:1), wherein the weight ratio of steel balls with a diameter of 6mm and 10mm is 4:1. Then the ball milling tank with steel balls and powders was filled with argon in the glove box and sealed, so that the ball milling process was carried out under the environment of argon. The ball mill adopts the QM-2SP12 planetary high-energy ball ...

Embodiment 3

[0041] At first the prealloyed powder (prepared by Tianjin Zhujin Science and Technology Development Co., Ltd.) whose composition is Fe-14wt%Cr-6wt%Al-1wt%W is prepared by gas atomization method, and 4 parts of prealloyed powders with a weight of 148.725g are weighed The powder is put into four 2000ml ball mill jars respectively. Then add 0.3wt% to 4 ball mill jars respectively) particle diameter is the Y of 40nm 2 o 3 Particles and 1.0wt% average diameter of 10 μm elemental Hf powder (Fe, Cr, Al, W, Y 2 o 3 The sum of Hf and Hf is the mass percent (100wt%). Then put 1500g stainless steel balls into 4 ball milling pots as the ball milling medium (ball-to-material ratio 10:1), wherein the weight ratio of steel balls with a diameter of 6mm and 10mm is 4:1. Then the ball milling tank with steel balls and powders was filled with argon in the glove box and sealed, so that the ball milling process was carried out under the environment of argon. The ball mill adopts the QM-2SP12...

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Abstract

The invention discloses high-strength aluminum-containing ferrite ODS steel and a preparation method thereof. The high-strength aluminum-containing ferrite ODS steel comprises, by mass percentage, 14-22% of Cr, 1-6% of Al, 1-3% of W, 0.3-1% of Hf, 0.3-3% of Y2O3 and the balance iron; and the high-strength aluminum-containing ferrite ODS steel is prepared through ball-milling mixing and isostatic pressing sintering. The alloy element Hf is added to improve mechanical performance of an alloy. After being subjected to bond breaking, the added Hf and Y2O3 are dissolved to base body powder in a solid form in the mechanical alloying process. In the sintering process, the Hf is combined with Y and O, and more stable and finer complex oxide is separated out of a base body. The complex oxide maintains the coherent or semi-coherent relation with the base body and effectively hinders dislocation motion, and thus, mechanical performance of a material is better improved.

Description

technical field [0001] The invention relates to composition design, structure characterization and high-temperature tensile performance test of a novel high-strength corrosion-resistant aluminum-containing ferritic ODS steel, which belongs to the preparation technology of powder metallurgy applied to nuclear reactor structural materials. Background technique [0002] It can be seen from the service environment that ODS (Oxide Discrete Strengthening) steel is in the harsh environment of long-term high temperature and high-intensity neutron irradiation, and traditional heat-resistant steel materials can no longer meet the requirements. Under the premise of ensuring a high safety margin and good design flexibility, advanced materials can improve and enhance the working efficiency of nuclear reactors through good tensile strength, thermal creep properties and excellent resistance to neutron radiation damage. The key technology to design materials with excellent high-temperature ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/22C22C38/06C22C33/02
Inventor 余黎明董红庆刘永长刘晨曦李会军
Owner TIANJIN UNIV
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