Abstract
Kinetic studies of plasma nitriding of 3% Cr-Mo-V DIN 39CrMoV13.9 steel were performed at 538, 510, and 483 °C. It was found that the process obeys a parabolic law of diffusion for total case depth and is slower than parabolic for effective case depth formation. The kinetics of renitriding was found to be a continuation of the preexisting case growth. Mathematical equations were developed for the relationships. Long exposure to the nitriding temperatures had a negative effect on the hardness of the steel.
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