Plasma nitriding of AISI 304 stainless steel: Role of surface mechanical attrition treatment

被引：61

作者：

Balusamy, T. ^{[1
,2
]}

Narayanan, T. S. N. Sankara ^{[1
,3
]}

Ravichandran, K. ^{[2
]}

Park, Il Song ^{[3
]}

Lee, Min Ho ^{[3
]}

机构：

[1] CSIR Natl Met Lab, Madras Ctr, Madras 600113, Tamil Nadu, India

[2] Univ Madras, Dept Analyt Chem, Madras 600025, Tamil Nadu, India

[3] Chonbuk Natl Univ, Dept Dent Biomat, Sch Dent, Jeonju 561756, South Korea

来源：

MATERIALS CHARACTERIZATION | 2013年 / 85卷

关键词：

Surface mechanical attrition treatment (SMAT); Nitriding; Diffusion; Phase transformation; Hardness; AUSTENITIC STAINLESS-STEEL; ION-IMPLANTATION; LAYER; MICROSTRUCTURE; NANOCRYSTALLIZATION; TOOL; MARTENSITE; BEHAVIOR; IRON;

D O I：

10.1016/j.matchar.2013.08.009

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The effect of surface roughness, volume fraction of martensite and the tendency to form CrN phase during plasma nitriding of AISI 304 stainless steel pretreated by surface mechanical attrition treatment (SMAT) is studied and compared with those formed on its untreated counterpart. The study reveals that the deleterious influence of surface roughness induced by SMAT on the case depth of the nitrided layer, if any, is surpassed by the favourable influence of martensite phase formed during SMAT in promoting the diffusion of nitrogen. Surface nanocrystallization with slip bands and dislocations in 304 stainless steel samples subjected to SMAT promotes migration of chromium, resulting in the formation of higher amounts of CrN phase than the untreated one under similar conditions of nitriding. The difference in the hardness of the nitrided layer formed on untreated 304 SS and those subjected to SMAT at the top surface is similar to 600 VHN25gf. (C) 2013 Elsevier Inc. All rights reserved.

引用

页码：38 / 47

页数：10

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