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Preparation method of high-strength powder austenitic stainless steel

A technology of powdered austenite and stainless steel, which is applied in the field of preparation of high-strength powdered austenitic stainless steel, can solve the problems of deteriorating intergranular corrosion performance, yield and performance, and influence, so as to improve the ability of intergranular corrosion resistance, The effect of reducing oxygen content and avoiding chromium-deficient areas

Active Publication Date: 2021-06-11
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the precipitation of carbides will lead to the generation of chromium-depleted areas and deteriorate its intergranular corrosion performance. Therefore, how to avoid the occurrence of chromium-depleted areas and effectively improve the strength of austenitic stainless steel is very important
[0004] In addition, the presence of oxygen in stainless steel can adversely affect its yield and performance

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] (1) Prepare 316Ti alloy powder by water-gas combined atomization, the powder particle size is 25 μm, and its oxygen content is 540ppm;

[0026] (2) Weigh atomized stainless steel powder and 5 μm zirconium powder according to the mass ratio of 99.5:0.5 in an argon-protected glove box, and put them into a mixing tank, and then carry out high-energy Ball milling for 20 hours to obtain uniform mechanical alloyed powder;

[0027] (3) Vacuum anneal the mechanically alloyed powder at 900°C for 2 hours to fully remove the work hardening caused by high-energy ball milling of the powder, and then crush and sieve to obtain the required alloy powder;

[0028] (4) Put the alloy powder into the silica gel sheath and vibrate it, seal it and carry out cold isostatic pressing, the pressing pressure is 200MPa, and the holding time is 2min to obtain the green body;

[0029] (5) Place the green body in a sintering furnace for vacuum sintering with a vacuum degree of 10 -2 Pa, the sinteri...

Embodiment 2

[0032] (1) Prepare 321 alloy powder by water-gas combined atomization, the powder particle size is 10 μm, and its oxygen content is 820ppm;

[0033] (2) Weigh the atomized stainless steel powder and 8 μm hafnium powder according to the mass ratio of 98.0:2.0 in an argon-protected glove box, put them into a mixing tank, and then carry out high-energy Ball milling for 12 hours to obtain uniform mechanical alloyed powder;

[0034] (3) Vacuum anneal the mechanically alloyed powder at 930°C for 3 hours to fully remove the work hardening caused by high-energy ball milling of the powder, and then crush and sieve to obtain the required alloy powder;

[0035] (4) Put the alloy powder into a rubber sheath and vibrate it, seal it and carry out cold isostatic pressing, the pressing pressure is 300MPa, and the holding time is 1.5min to obtain a green body;

[0036] (5) Place the green body in a sintering furnace for vacuum sintering with a vacuum degree of 10 -2 Pa, the sintering tempera...

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Abstract

The invention discloses a preparation method of high-strength powder austenitic stainless steel and belongs to the field of powder metallurgy. According to the method, a titanium-containing stainless steel powder prepared through water-gas combined atomization is taken as a raw material, zirconium-hafnium powder is added to serve as a carbon fixing agent and an oxygen fixing agent, and the zirconium-hafnium powder and atomized steel powder are subjected to high-energy ball milling, forming, sintering and heat treatment, so as to obtain a high-strength powder stainless steel product. Zirconium, hafnium and titanium belong to elements of the same family and are similar in chemical property, when zirconium, hafnium and titanium are added into a stainless steel system, intergranular corrosion can be further prevented, meanwhile, Ti, Zr (Hf) and O form an ordered phase in the sintering and heat treatment process, so that the effects of reducing the oxygen content of a steel matrix and strengthening a second phase are achieved, the plasticity of the steel matrix is improved, meanwhile, the material strength is greatly improved, and the high-strength powder stainless steel product is obtained. The preparation method has the advantages of simple preparation process, no need of additional equipment, high production efficiency, no pollution or inclusion, excellent performance and the like.

Description

technical field [0001] The invention belongs to the field of powder metallurgy and provides a preparation method of high-strength powder austenitic stainless steel. Background technique [0002] Due to its excellent strength-toughness matching and corrosion resistance, high-strength stainless steel is widely used in aerospace, marine engineering, energy and other equipment manufacturing fields that are related to the national economy and people's livelihood, such as the main load-bearing components of aircraft, fasteners, satellite gyroscopes Instruments, spacecraft shells, offshore oil platforms, automobile industry, nuclear energy industry, gear and bearing manufacturing, etc., are the materials of choice for lightweight design and energy saving and emission reduction of future equipment components. [0003] At present, the research and development of high-strength stainless steel are more focused on martensitic precipitation hardening stainless steel and maraging steel, e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/08B22F9/04B22F1/00B22F3/04B22F3/10B22F3/24C22C33/02
CPCB22F9/082B22F9/04B22F3/04B22F3/1007B22F3/24C22C33/0207B22F2009/043B22F2009/041B22F2003/248C21D2211/001B22F1/142Y02E30/30
Inventor 杨芳秦乾周洋郭志猛陈存广隋延力芦博昕邵艳茹
Owner UNIV OF SCI & TECH BEIJING
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