# On the Formation of Austenite during Ion Nitriding of Armco Iron

Kurny, ASW and Mallya, RM and Rao, Mohan M (1988) On the Formation of Austenite during Ion Nitriding of Armco Iron. In: Journal of the Less Common Metals, 144 (2). pp. 201-207.

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## Abstract

The ion-nitriding behaviour of Armco-iron in the temperature range of 475–550 °C in a $25N_2:75H_2$ gas mixture has been studied using optical metallography and X-ray diffraction techniques. The austenite phase was detected at short treatment times in the temperature range 500–550 °C but it disappeared with increasing duration of treatment. It has been shown that nitrogen supersaturation in ferrite adjacent to the nitride layer causes its transformation to austenite. This austenite disappears by reacting with nitrogen to form the ${\gamma}'$ nitride.

Item Type: Journal Article Copyright for this article belongs to Elsevier. formation;austenite;ion nitriding;armco iron. Division of Mechanical Sciences > Materials Engineering (formerly Metallurgy) 13 Aug 2008 19 Sep 2010 04:49 http://eprints.iisc.ernet.in/id/eprint/15561