Plasma Nitriding of CrMoV Steel for the Enhancement of Hardness and Corrosion Resistance
Article dans une revue avec comité de lecture
Date
2022-01-12Journal
Transactions of the Indian Institute of MetalsAbstract
In the plasma ionic environment of nitrogen and
hydrogen at 4:1 ratio, nitriding had been realized in the
plasma laboratory. Nitriding of steel samples was followed
at the lower temperature of 450 C and also at the higher
temperature of 550 C while the sample was biased at the
fixed - 250 V. Steel nitrided at 550 C had shown a significantly enhanced resistance to corrosion in comparison
to that of steel nitrided at 450 C. X-ray diffraction studies
of nitrided steels had shown the presence of nitrides of iron
(FexN). Scanning electron microscopic and the electron
dispersive spectroscopic analyses (SEM ? EDS) of the
cross section of the nitrided steels had shown the nitrided
layer and the elemental distribution from top to the core.
Following structural analysis, microhardness and the
potentiodynamic polarization tests were performed. A
significant improvement in hardness (* 1180 Hv) and the
case depth * 150 lm was obtained after nitriding at the
higher temperature. Corrosion resistance was also found to
be significantly improved. These achievements might be
attributed to the presence of FexN, CrN phases and also to
the nitrogen solid solution.
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