奥氏体不锈钢的低温离子氮碳共渗研究

利用低压等离子体辉光放电技术对AISI 316奥氏体不锈钢进行低温离子氮碳共渗硬化处理，处理是在不降低奥氏体不锈钢耐蚀性能的前提下进行的。处理后的奥氏体不锈钢属于一种无氮化铬或碳化铬析出的氮和碳的过饱和固溶体(S相结构)。这种渗入钢中的过饱和氮和碳元素引起奥氏体晶格发生畸变，使渗层的硬度和耐磨性都有较大幅度的提高。由于处理后的奥氏体不锈钢渗层内的最大含氮量和最大含碳量分别出现在不同的深度，因而使离子氮碳共渗处理后的奥氏体不锈钢既有离子渗氮处理的高硬度，又有离子渗碳处理后的高的渗层厚度和良好的硬度梯度等特点。

Plasma Nitrocarburising of Austenitic Stainless Steel at Low Temperature

Surface hardening of AISI 316 austenitic stainless steel without degradation of corrosion resistance was carried out using plasma nitrocarburising process at low temperature. It was found that the supersaturation of the alloying elements (N and C) in the austenitic lattice and the precipitation-free layer on austenitic stainless steel (i.e. the S phase) could enhance the layer hardness and wear resistance. The GDS analysis results show that the maximum N and C concentration in the layer were in the different depth. The plasma nitrocarburising layers have not only high hardness as that of plasma nitriding, but also gradual hard profile and high thickness as that of plasma carburising.