Microstructure and performance  of austenitic stainless steel with ionic permeation of N

Journal of Lanzhou University of Technology ›› 2020, Vol. 46 ›› Issue (1): 7-12.

• Materials Science and Engineering • Previous Articles Next Articles

Microstructure and performance of austenitic stainless steel with ionic permeation of N

LAN Ye-feng¹, WANG Chuang-zao¹, HU Qiu-chen¹, HU Wei-wei², LI Qing-lin¹

1. College of Materials Science and Engineering, Lanzhou Univ. of Tech. , Lanzhou 730050, China;
2. Forging Factory, Lanzhou Wanli Aviation Electromechanical Co. Ltd. , Lanzhou 730050, China

Received:2019-01-07 Online:2020-02-28 Published:2020-06-23

Abstract

Abstract: The surface nitriding treatment of austenitic stainless steel ball valve is carried out with technique of glowing ion permeation of N, so that its surface structure is changed and surface wear resistance is improved. Three sets of temperature of 400, 440 and 480 ℃ are chosen for ion permeation of N respectively, and the time of permeation of N is set to be 12 h. Scanning electron microscope, optical microscope, X-ray diffractometer, Vickers microhardness tester and material surface comprehensive tester are used to test the surface morphology, cross-sectional morphology, microhardness and wear resistance of the N-modified layer. The result shows that the technique of ion permeation of N will be able to improve greatly the hardness and wear resistance of austenitic stainless steel, when the temperature of infiltration of N is 400 ℃, the N-modified layer will be the thinnest and the wear resistance will be the worst, the N-modified layer nitrided at 480 ℃ will be the thickest and its wear resistance — the best.

Key words: austenitic stainless steel, ionic permeation of N, seepage temperature of N, hardness, wear resistance

CLC Number:

TG174.4

LAN Ye-feng, WANG Chuang-zao, HU Qiu-chen, HU Wei-wei, LI Qing-lin. Microstructure and performance of austenitic stainless steel with ionic permeation of N[J]. Journal of Lanzhou University of Technology, 2020, 46(1): 7-12.

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Microstructure and performance of austenitic stainless steel with ionic permeation of N

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