Microstructure analysis of 304L austenitic stainless steel by QPQ complex salt bath treatment

被引：32

作者：

Li, Gui Jiang ^{[1
]}

Peng, Qian ^{[2
]}

Li, Cong ^{[2
]}

Wang, Ying ^{[2
]}

Gao, Jian ^{[3
]}

Chen, Shu-Yuan ^{[3
]}

Wang, Jun ^{[1
]}

Shen, Bao-Luo ^{[1
]}

机构：

[1] Sichuan Univ, Coll Mat Sci & Engn, Chengdu 610064, Peoples R China

[2] Nucl Power Inst China, Chengdu 610041, Peoples R China

[3] Chengdu Tool Inst, Sichuan 610051, Xindu, Peoples R China

来源：

MATERIALS CHARACTERIZATION | 2008年 / 59卷 / 09期

关键词：

304L austenitic stainless steel; QPQ salt bath; microstructure; X-ray diffraction; SEM;

D O I：

10.1016/j.matchar.2007.09.011

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The microstructure of nitro-carburized and post-oxidized 304L austenitic stainless steel (SS) produced by a Quench-Polish-Quench complex salt bath process (QPQ) was investigated. The nitro-carburized coating as a whole consists of CrN, gamma'-Fe4N and expanded austenite S (gamma(N)). On the post-oxidized surfaces, XRD analyses revealed the existence of a superficial compound xi-Fe-2(N,C) sub-layer, the presence of magnetite (Fe3O4) and a small amount of FeO. At greater depth from the surface of the post-oxidized surface, S(gamma(N)) is formed and subsequently transforms partially into CrN and ferrite/martensite (alpha(N)). A modestly higher sub-surface hardness and a superior hardness profile were obtained by post-oxidizing, although its surface hardness was lower than that produced by nitro-carburizing alone. (c) 2007 Elsevier Inc. All rights reserved.

引用

页码：1359 / 1363

页数：5

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