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Low-temperature plasma nitriding of martensitic stainless steel

Article dans une revue avec comité de lecture
Author
RAO, K. Ram Mohan
1059292 GITAM Institute of Science - Department of Chemistry
TRINADH, Kalimi
1059292 GITAM Institute of Science - Department of Chemistry
NOUVEAU, Corinne
127742 Laboratoire Bourguignon des Matériaux et Procédés [LABOMAP]

URI
http://hdl.handle.net/10985/19798
DOI
10.1007/s12666-020-02013-8
Date
2020
Journal
Transactions of the Indian Institute of Metals

Abstract

This study presents the plasma nitriding of Cr–Mo–V tool steel to protect it from environmental degradation. The steel samples after metallographic polishing were nitrided in the glow discharge plasma of N2 and H2 gas mixture (80:20). Nitriding was performed at two different temperatures, a lower temperature of 450 C and the higher temperature of 500 C. The potentiodynamic polarization tests in 3.5% NaCl electrolyte had shown the enhancement of corrosion resistance of steels after nitriding. X-ray diffraction (XRD) studies and scanning electron microscopic analysis coupled with energy dispersive spectroscopic analysis (SEM/EDS) was performed to understand the modification of surface microstructure. XRD analysis of the nitrided steels revealed the presence of γ′- and ε-nitrides of iron, which were responsible for the improvement of corrosion resistance.

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