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Previous Heat Treatment Inducing Different Plasma Nitriding Behaviors In Martensitic Stainless Steels, C A. Figueroa, F Alvarez, D Rg Mitchell, G A. Collins, K T. Short

Australian Institute for Innovative Materials - Papers

In this work we report a study of the induced changes in structure and corrosion behavior of martensitic stainless steels nitrided by plasma immersion ion implantation (PI3) at different previous heat treatments. The samples were characterized by x-ray diffraction and glancing angle x-ray diffraction, scanning electron microscopy, energy dispersive x-ray spectroscopy, and potentiodynamic measurements. Depending on the proportion of retained austenite in the unimplanted material, different phase transformations are obtained at lower and intermediate temperatures of nitrogen implantation. At higher temperatures, the great mobility of the chromium yields CrN segregations like spots in random distribution, and the a' -martensite is …