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Abstract
The influence of experimental parameters, such as temperature, time, alloy composition and nitriding bath composition, on nitriding case formation on three steels has been investigated. Two of the steels are of low alloy type, one with low carbon (DIN 1·6523) and the other with medium carbon (DIN 1·7225). The third alloy is a nitriding alloy (DIN 1·8550). Two cyanate baths are used, i.e. type 1 (80 wt-% potassium cyanate) and type 2 (40 wt-% potassium cyanate). Higher temperatures, times and bath compositions result in a thicker case. As it thickens, the compound layer becomes composed of ϵ type nitrides. In general, DIN 1·6523 has developed thicker cases, and DIN 1·8550 with Al and Cr has formed thinner cases. Porosity has been observed in the cases, and the roughness of the nitrided surfaces has been measured to be greater for the higher carbon content alloy (DIN 1·7225) in this study.