Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1572780 | Materials Characterization | 2008 | 5 Pages |
Abstract
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, γâ²-Fe4N and expanded austenite S(γN). On the post-oxidized surfaces, XRD analyses revealed the existence of a superficial compound ξ-Fe2(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(γN) is formed and subsequently transforms partially into CrN and ferrite/martensite (αN). 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.
Related Topics
Physical Sciences and Engineering
Materials Science
Materials Science (General)
Authors
Gui-jiang Li, Qian Peng, Cong Li, Ying Wang, Jian Gao, Shu-yuan Chen, Jun Wang, Bao-luo Shen,