Abstract
The present paper deals with the methodology adopted for pulsed plasma nitriding of chromium plated type 316LN austenitic stainless steel. The influence of nitriding temperature, time and gas mixture ratio of nitrogen to hydrogen on the nitriding behaviour of chromium plated type 316 stainless steel has been investigated. The results indicated that the nitriding temperature plays a dominant role in obtaining hardness and case depth in this material. Plasma nitriding at a temperature of about 833 K produced a case depth of about 5 µm and surface hardness of about 550 HV. At temperatures more than 1 073 K, a large fraction of chromium has been found to be converted to chromium nitride with hardness exceeding 1 000 HV. Nitriding at an intermediate temperature of 913 K for 45 h has been found to produce nitrided layer of optimum properties. Calculation of diffusion co-efficients and activation energy for nitrogen diffusion are presented to demonstrate that the nitride layer growth in chromium plated stainless steel is a diffusion controlled process.
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