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 e-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 e-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.
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