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

T. Balusamy; T. S.N.Sankara Narayanan; K. Ravichandran; Il Song Park; Min Ho Lee

doi:10.1016/j.matchar.2013.08.009

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

T. Balusamy
, T. S.N.Sankara Narayanan^*
, K. Ravichandran
, Il Song Park
, Min Ho Lee

^*Corresponding author for this work

CSIR - National Metallurgical Laboratory
University of Madras
Jeonbuk National University

Research output: Contribution to journal › Journal article › peer-review

75 Scopus citations

Abstract

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 ~ 600 VHN_25gf.

Original language	English
Pages (from-to)	38-47
Number of pages	10
Journal	Materials Characterization
Volume	85
DOIs	https://doi.org/10.1016/j.matchar.2013.08.009
State	Published - 2013

Keywords

Diffusion
Hardness
Nitriding
Phase transformation
Surface mechanical attrition treatment (SMAT)

Quacquarelli Symonds(QS) Subject Topics

Engineering - Mechanical
Materials Science
Physics & Astronomy

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10.1016/j.matchar.2013.08.009

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@article{62c84ae17f1d497f9f819e1c147d68cb,

title = "Plasma nitriding of AISI 304 stainless steel: Role of surface mechanical attrition treatment",

abstract = "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 \textasciitilde{} 600 VHN25gf.",

keywords = "Diffusion, Hardness, Nitriding, Phase transformation, Surface mechanical attrition treatment (SMAT)",

author = "T. Balusamy and Narayanan, \{T. S.N.Sankara\} and K. Ravichandran and Park, \{Il Song\} and Lee, \{Min Ho\}",

year = "2013",

doi = "10.1016/j.matchar.2013.08.009",

language = "English",

volume = "85",

pages = "38--47",

journal = "Materials Characterization",

issn = "1044-5803",

}

TY - JOUR

T1 - Plasma nitriding of AISI 304 stainless steel

T2 - Role of surface mechanical attrition treatment

AU - Balusamy, T.

AU - Narayanan, T. S.N.Sankara

AU - Ravichandran, K.

AU - Park, Il Song

AU - Lee, Min Ho

PY - 2013

Y1 - 2013

N2 - 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 ~ 600 VHN25gf.

AB - 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 ~ 600 VHN25gf.

KW - Diffusion

KW - Hardness

KW - Nitriding

KW - Phase transformation

KW - Surface mechanical attrition treatment (SMAT)

UR - https://www.scopus.com/pages/publications/84884882360

U2 - 10.1016/j.matchar.2013.08.009

DO - 10.1016/j.matchar.2013.08.009

M3 - Journal article

AN - SCOPUS:84884882360

SN - 1044-5803

VL - 85

SP - 38

EP - 47

JO - Materials Characterization

JF - Materials Characterization

ER -

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

Abstract

Keywords

Quacquarelli Symonds(QS) Subject Topics

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