Role of surface mechanical attrition treatment and chemical etching on plasma nitriding behavior of AISI 304L steel

Role of surface mechanical attrition treatment and chemical etching on plasma nitriding behavior of AISI 304L steel

In the present study, the effect of surface mechanical attrition treatment (SMAT) on corrosion resistance and plasma nitriding behavior of AISI 304L stainless steel (SS) was investigated. Mechanical twins and deformation induced martensite phase were observed in the SMAT affected region. SMAT improv...

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Bibliographic Details
Published in:Surface & coatings technology Vol. 304; pp. 413 - 424
Main Authors: Gatey, Atul M., Hosmani, Santosh S., Figueroa, Carlos A., Arya, Shashi B., Singh, Rajkumar P.
Format: Journal Article
Language:English
Published: Elsevier B.V 25-10-2016
Subjects:
Chemical cleaning/etching
Corrosion
Nitriding
Peening intensity
SMAT
Stainless steel
Peening intensity
Nitriding
Chemical cleaning/etching
SMAT
Corrosion
Stainless steel
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Summary:In the present study, the effect of surface mechanical attrition treatment (SMAT) on corrosion resistance and plasma nitriding behavior of AISI 304L stainless steel (SS) was investigated. Mechanical twins and deformation induced martensite phase were observed in the SMAT affected region. SMAT improved the corrosion resistance and nitriding kinetics of AISI 304L SS. Effective nitriding time and hence, the thickness of the nitrided layer were increased with increase in the duration of chemical etching and a decrease in the stability of passive layer on the SMATed specimens. Surface hardness of the nitrided specimens was dependent on the formation of expanded austenite (γN) and its decomposition (especially, at higher effective nitriding time). •SMAT had influenced passivation ability and corrosion resistance, which plays an important role in nitriding kinetics.•A term called ‘effective nitriding time’ was useful in understanding the plasma-nitriding response of SMATed specimens.
ISSN:0257-8972
1879-3347
DOI:10.1016/j.surfcoat.2016.07.020