奥氏体不锈钢卡套表面硬化处理工艺探索

Plasma carburizing of austenitic stainless steel cutting ferrule was carried out at low temperature to improve the surface hardness. Microstructure, phase composition, surface hardness and corrosion resistance of the carburized layer were analyzed by means of optical microscope, X-ray diffraction (XRD), Vickers hardness tester and polarization testing technique. The results showed that a layer of carbon supersaturated solid solution (i.e. the Sc phase) can be formed on the steel surface without precipitation of chromium carbide. The surface hardness of the carburized steel is greatly improved without degradation of its corrosion resistance. So that the cutting ferrule has a good comprehensive mechanical properties.