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Forming method for nanometer beta' phase element and nanometer oxide composite reinforced Fe-based ODS alloy

A nano-oxide, iron-based technology, applied in the field of metal dispersion strengthening, can solve the problems of high-temperature mechanical properties, uneven distribution of oxide particles, uncontrollable interface structure, etc., which limit the strengthening effect of oxides. The effect of shortening ball milling time and reducing energy consumption

Inactive Publication Date: 2013-08-07
UNIV OF SCI & TECH BEIJING
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  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

[0004] In traditional iron-based ODS alloys, the oxide dispersoid phase is externally added Y 2 o 3 Particles are introduced in the form of Y 2 o 3 The particles are very stable, so high energy and long ball milling time are required to decompose them, and it is easy to leave undecomposed coarse Y due to powder agglomeration 2 o 3 Particles, there are problems such as uneven distribution of oxide particles, coarse particle size and uncontrollable interface structure, which to a large extent limits the play of the strengthening effect of oxides and the improvement of high-temperature mechanical properties

Method used

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  • Forming method for nanometer beta' phase element and nanometer oxide composite reinforced Fe-based ODS alloy
  • Forming method for nanometer beta' phase element and nanometer oxide composite reinforced Fe-based ODS alloy
  • Forming method for nanometer beta' phase element and nanometer oxide composite reinforced Fe-based ODS alloy

Examples

Experimental program
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Effect test

Embodiment 1

[0016] Example 1: Preparation of a composite strengthened iron-based ODS alloy containing 14vol.% β' phase and 0.3wt.% oxide

[0017] Using high-purity Fe powder, Cr powder, Mo powder, Ni powder, Al powder, Fe 2 o 3 Powder, YH 2 Ti powder and Ti powder are raw materials. Prepare the mixed powder according to the following mass percentage content: 8wt% Cr, 10wt% Ni, 4wt% Al, 2wt% Mo, 0.3wt% Ti, 0.21wt% Fe 2 o 3 , 0.24wt% YH 2 and balance Fe. An additional 0.3 wt.% stearic acid was added to the mixed powder as a process control agent. The above-mentioned powders were pre-mixed uniformly and then subjected to high-energy ball milling. The rotational speed of the ball mill was 340 rpm, and the ball milling time was 36 hours to obtain mechanically alloyed powders. It is densified by discharge plasma sintering method, the sintering temperature is 900°C, the pressure is 50MPa, and the holding time is 15min. Sintering and densification of iron-based ODS alloy for solution tr...

Embodiment 2

[0018] Example 2: Preparation of a composite strengthened iron-based ODS alloy containing 18vol.% β' phase and 0.4wt.% oxide

[0019] Using high-purity Fe powder, Cr powder, Mo powder, Ni powder, Al powder, Fe 2 o 3 Powder, YH 2 Ti powder and Ti powder are raw materials. Prepare the mixed powder according to the following mass percentage content: 10wt% Cr, 10wt% Ni, 6.5wt% Al, 2.5wt% Mo, 0.4wt% Ti, 0.28wt% Fe 2 o 3 , 0.32wt% YH 2and balance Fe. An additional 0.4 wt.% stearic acid was added to the mixed powder as a process control agent. The above-mentioned powders were pre-mixed uniformly and then subjected to high-energy ball milling. The rotational speed of the ball mill was 400 rpm, and the ball milling time was 48 hours to obtain mechanically alloyed powders. It is densified by discharge plasma sintering method, the sintering temperature is 950°C, the pressure is 40MPa, and the holding time is 5min. Sintering and densification of iron-based ODS alloy for solution...

Embodiment 3

[0020] Example 3: Preparation of a composite strengthened iron-based ODS alloy containing 28vol.% β' phase and 0.5wt.% oxide

[0021] Using high-purity Fe powder, Cr powder, Mo powder, Ni powder, Al powder, Fe 2 o 3 Powder, YH 2 Ti powder and Ti powder are raw materials. Prepare the mixed powder according to the following mass percentage content: 15wt% Cr, 15wt% Ni, 10wt% Al, 3wt% Mo, 0.5wt% Ti, 0.35wt% Fe 2 o 3 , 0.40wt% YH 2 and balance Fe. An additional 0.5 wt.% stearic acid was added to the mixed powder as a process control agent. The above-mentioned powders were pre-mixed uniformly and then subjected to high-energy ball milling. The rotational speed of the ball mill was 450 rpm, and the ball milling time was 60 hours to obtain mechanically alloyed powders. Hot isostatic pressing is used for densification, and low-carbon steel is used to wrap the mechanically alloyed powder, and then hot isostatic pressing is carried out. The hot isostatic pressing temperature is ...

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Abstract

The invention provides a forming method for nanometer beta' phase element and nanometer oxide composite reinforced Fe-based ODS alloy, and belongs to the field of metal dispersion reinforcement technology. A matrix element powder (Fe, Cr, Mo) and a beta' phase forming element powder (Ni, Al) and an oxide are formed into a component (Fe2O3, YH2 and Ti), and are pre-mixed uniformly, and then a high energy ball milling is carried out in Ar atmosphere with high purity, and a nanometer oxide dispersion phase is formed in situ by mechanical chemical reaction, thereby the nucleation energy barrier is reduced, and the oxide is nucleated uniformly. And then alloy powder after high energy ball milling is processed by SPS sintering or hot isostatic pressing densification. After solid solution and ageing heat treatment, the nanometer beta' phase element and the nanometer oxide composite reinforced Fe-based ODS alloy are obtained. According to the invention, two reinforced phases such as nanometer beta' phase and nanometer oxide are simultaneously introduced into the Fe-based ODS alloy, and the reinforced effects of the two nanometer precipitated phases are superposed, and the two precipitated phases has the advantages of very fine particle sizes, uniform distribution, high heat stability and substantial reinforcement effect, thereby further enlarging the usage temperature limit of the Fe-based ODS alloy.

Description

technical field [0001] The invention belongs to the technical field of metal dispersion strengthening, and in particular provides a method for preparing an iron-based ODS (Oxide Dispersion Strengthening) alloy strengthened by composite nanometer intermetallic compound (β? phase) and nanometer oxide by adopting a mechanical alloying process. Background technique [0002] Iron-based ODS alloys have excellent high-temperature creep properties, high-temperature oxidation and corrosion resistance, and excellent radiation resistance. It is not only a candidate material for the first wall cladding tube, cladding and other high-temperature structural parts of the fourth-generation nuclear fusion reactor, but also in the thermal protection structure and engine hot-end parts of aerospace aircraft, and high-temperature parts of advanced gas turbines, etc. All fields have important application prospects. [0003] Nanoprecipitation strengthening is one of the most promising strengthenin...

Claims

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Application Information

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IPC IPC(8): C22C38/50C22C33/02
Inventor 章林曲选辉秦明礼何新波赵晓玮
Owner UNIV OF SCI & TECH BEIJING
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