A kind of preparation method of oxide dispersion strengthened alloy powder

Abstract

The invention provides a preparation method of oxide strengthened dispersion alloy powder. The preparation method comprises the steps that raw powder is placed into a first tube-type vacuum furnace, CO-CO2 mixed gas is led into the first tube-type vacuum furnace, the temperature is made to rise to 600-750 DEG C, and the temperature is kept for 0.5-1 h; vacuumizing is conducted until the vacuum degree is lower than 0.01 Pa, temperature is kept for 0.3-0.8 h, the vacuum degree is kept and the temperature is made to fall to room temperature; nanometer oxide powder is placed into a second tube-type vacuum furnace and drying degassing is conducted for 1-3 h on the conditions that the temperature is 400-600 DEG C and the vacuum degree is lower than 0.01 Pa; the processed raw powder and the nanometer oxide powder are mixed and placed into a vacuum ball grinding tank, Ar and CO-CO2 mixed gas with the pressure being 0.1-0.3 MPa and the volume ratio being 1:0.5-1:1 are led into the vacuum ball grinding tank, and alloy powder is obtained through ball grinding; the alloy powder is placed into a third tube-type vacuum furnace and temperature is kept for 0.3-0.8 h on the conditions that the vacuum degree is lower than 0.01 Pa and the temperature is 250-350 DEG C; the temperature is made to rise to 400-600 DEG C, CO2 gas with the vacuum degree being 1000-5000 Pa is led in, and the temperature is kept for 0.5-1.5 h; vacuumizing is conducted until the vacuum degree is lower than 0.01 Pa, temperature is kept for is conducted for 1-3 h, the vacuum degree is kept until the temperature falls to room temperature, and then the oxide strengthened dispersion alloy powder is obtained.

Description

technical field [0001] The invention relates to the technical field of material preparation, in particular to a preparation method of oxide dispersion strengthened alloy powder. Background technique [0002] Oxide dispersion strengthened alloy is a kind of alloy that adds high thermal stability and chemical stability nano-oxide particles to the alloy to make it evenly dispersed in the matrix, and strengthens by hindering dislocation and grain boundary movement. Oxide dispersion strengthened alloys can be widely used but not limited to nuclear reactors, aerospace engines, gas turbines, energy industry and automobile industry, etc. Oxide dispersion strengthened alloys have better high-temperature creep fatigue performance, radiation damage resistance and corrosion resistance than iron-based and nickel-based alloys without oxide disperse phase, but at the same time, there are lower elongation and toughness. The problem of rising brittle transition temperature. Its performance...

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Problems solved by technology

[0005] The invention provides a preparation method of oxide dispersion strengthened alloy powder, which is used to solve the defects of low material elongation and high ductile-brittle transition temperature caused by high oxygen content of oxide dispersion strengthened alloy powder in the prior art, and at the same time It can also ensure the toughness of the material

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