奥氏体不锈钢低温离子渗氮工艺研究

对304、316 L奥氏体不锈钢进行了不同温度、不同时间的离子渗氮。研究了渗层的显微组织和耐腐蚀性，测定了渗层的硬度。结果显示，随着渗氮温度的升高，两种钢渗层的表面硬度和深度都增加，而耐蚀性降低。渗氮温度≥400℃时，随着渗氮时间的延长，两种钢渗层的表面硬度变化不大，但深度明显增加，渗层的耐蚀性降低。当渗氮工艺相同时，316 L钢渗氮层的硬度、深度和耐蚀性均比304钢的渗氮层高。

Ion Nitriding of Austenitic Stainless Steels

Types 304 and 316L austenitic stainless steels were ion nitrided at different temperatures for different time.The microstructure and corrosion resistance of the case were investigated , and the hardness of the case was tested .The results show that with the raise of ion nitriding temperature , both the surface hardness and the depth of case of the both steels increase , but the corrosion resistance decreases , and that when ion nitriding temperatures are 400 ℃ and above , with the prolongation of ion nitriding time , the surface hardness of the both steels will not appreciably change , the depth of case increases obviously , and the corrosion resistance of case reduces .After being ion nitrided at the same temperature for the same time , type 316L steel is superior to type 304 steel in the hardness , depth and corrosion resistance of case .