A method for preparing oxide dispersion strengthened iron-based alloy

A dispersion-strengthening, iron-based alloy technology, applied in the field of powder metallurgy materials, can solve the problems of difficulty in preparing oxide dispersion-strengthening iron-based alloys, reduce the mechanical properties of materials, etc., achieve short ball milling time, improve mechanical properties, and reduce production costs. Effect

Active Publication Date: 2016-08-17
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method has a simple preparation process, but long-term high-temperature sintering oxidizes the powder surface, reduces the mechanical properties of the material, and makes it difficult to prepare high-performance oxide dispersion-strengthened iron-based alloys.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Select Fe-14.1Cr-3.3W-0.48Ti-0.59Y (mass fraction%) pre-alloyed powder prepared by Ar gas atomization (its particle size is less than or equal to 150μm (-100 mesh)), and put it into a stainless steel ball milling tank for ball milling. The ball-to-battery ratio is 12:1; a sealed ball mill tank equipped with a vacuum exhaust valve is used. The diameter of the exhaust valve is 5mm. During the ball milling process, the vacuum exhaust valve of the ball mill tank is kept open to make the atmosphere in the ball mill tank and the atmosphere The ball milling speed is 300r / min, and the ball milling time is 12h; after the ball milling, it is sieved in the protective atmosphere of the glove box to obtain the ball milled powder with an oxygen content of 0.19% (mass fraction).

[0038] Put the ball mill powder into the steel sheath; vacuum the sheath to 10 -1 Degassing above Pa for more than 60 minutes, welding and sealing; hot extrusion molding at 1000℃, extrusion ratio of 9:1 to obtai...

Embodiment 2

[0040] Select Fe-13.91Cr-4.03W-0.52Ti-0.60Y (mass fraction%) pre-alloyed powder prepared by Ar gas atomization (its particle size is less than or equal to 75μm (-200 mesh)), and put it into a stainless steel ball milling tank for ball milling. The ball-to-material ratio is 10:1. The ball mill tank is equipped with a vacuum exhaust valve and can be sealed. The diameter of the exhaust valve is 5mm. During the ball milling process, the vacuum exhaust valve of the ball mill tank is kept open to make the atmosphere in the ball mill tank communicate with the atmosphere. ; The ball milling speed is 350r / min, the ball milling time is 16h, after the ball milling, sieving in the protective atmosphere of the glove box to obtain the ball milled powder with an oxygen content of 0.21% (mass fraction).

[0041] Put the ball mill powder into the steel sheath; vacuum the sheath to 10 -1 Degassing above Pa for more than 60 minutes, welding and sealing; hot extrusion molding at 1100℃, extrusion rati...

Embodiment 3

[0043] Select Fe-13.8Cr-3.8W-0.51Ti-0.62Y (mass fraction%) pre-alloyed powder prepared by Ar gas atomization (its particle size is less than or equal to 150μm (-100 mesh)), and put it into a stainless steel ball mill tank for ball milling. The material ratio is 12:1, and a sealed ball mill tank equipped with a vacuum exhaust valve is used. The diameter of the exhaust valve is 5mm. During the ball milling process, the vacuum exhaust valve of the ball mill tank is kept open to make the atmosphere in the ball mill tank communicate with the atmosphere. ; The ball milling speed is 350r / min, the ball milling time is 24h, after the ball milling, sieving in the protective atmosphere of the glove box to obtain the ball milled powder with an oxygen content of 0.30% (mass fraction).

[0044] Put the ball mill powder into the steel sheath; vacuum the sheath to 10 -1 Degassing above Pa for more than 60 minutes, welding and sealing; hot extrusion molding at 1100℃, extrusion ratio of 12:1, to ob...

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Abstract

The invention discloses a method for preparing an oxide dispersion strengthened iron-based alloy, belonging to the field of powder metallurgy materials. The method comprises the following steps: mechanically ball-grinding Y and Ti element alloyed atomized iron-based pre-alloyed powder for 12-24h in air atmosphere, to prepare oxygen-containing powder in which oxygen is evenly distributed, and performing thermal consolidation forming and thermal treatment to obtain nano-oxide dispersion strengthened iron-based alloy. Oxygen in the ball-grinding atmosphere is introduced into the powder matrix through mechanical ball grinding, nano-scale oxide strengthening phase can be evenly precipitated from the alloy matrix through thermal consolidation forming and thermal treatment, long-time ball grinding can be avoided, and the mechanical alloying time of the traditional preparation technology can be shortened; the formed nano-oxide second phase is evenly distributed in the matrix in a dispersed manner, and the room temperature and high-temperature strength of the alloy can be effectively increased; the preparation technology is simple, and the prepared alloy has excellent room-temperature and high-temperature mechanical performances, and is suitable for industrial large-scale preparation.

Description

Technical field [0001] The invention relates to a method for preparing oxide dispersion strengthened iron-based alloys, and belongs to the field of powder metallurgy materials. Background technique [0002] Oxide dispersion strengthening (ODS) iron-based alloys have excellent high-temperature strength, high-temperature creep resistance and radiation resistance stability, and are the preferred structural materials in the fields of nuclear energy and thermal processing. [0003] At present, the preparation of ODS iron-based alloys mainly adopts the mechanical alloying (MA) method to uniformly disperse the oxide particles into the alloy powder matrix, and then is obtained by consolidation forming and processing. The strengthening effect depends on the size of the oxide dispersed phase and distributed. Usually, Y 2 O 3 The oxide powder is mixed with the raw material powder, crushed by mechanical ball milling, and dispersed into the powder matrix. In the subsequent forming and processi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C33/02
Inventor 刘祖铭郭薇黄伯云段清龙黄立清李志远陈仕奇
Owner CENT SOUTH UNIV
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