Gas nitriding of En40B steel with highest growth rate of the case and reduced white layer formation
by Shahjahan Mridha
International Journal of Microstructure and Materials Properties (IJMMP), Vol. 2, No. 1, 2007

Abstract: The Nitrided Layer (NL) thickness produced on En40B steel after treating in ammonia–hydrogen gas mixtures is found to increase parabolically with increasing the processing time, and its growth kinetics produces a linear relationship with nitriding potential up to a certain point where a white layer formed. At 470°C the growth rate is constant where presumably γ′-Fe4N only is present while at 520°C this constancy appears in the presence of ε-Fe₃N. At 570°C the growth rate continues to increase, but not linearly, even when γ′-Fe₄N is present and constancy appears well ahead of the presence of ε-Fe₃N phase. The findings suggest that the growth of NL is a maximum in an optimum gas mixture where the thickness of the white layer is a minimum.

Online publication date: Sat, 31-Mar-2007

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