温度对AISI304奥氏体不锈钢离子渗氮的影响

Effect of temperature on ion nitriding of AISI304 austenitic stainless steel

对AISI304奥氏体不锈钢进行脉冲电流辉光离子渗氮处理,在不同处理温度(480℃、520℃、580℃)下渗氮8h后,获得了一定厚度的渗氮层。通过对渗层进行金相分析和硬度测试表明,随着渗氮温度升高,渗层厚度增大,显微硬度先增大后减小。综合温度对渗层厚度与显微硬度的影响,AISI304奥氏体不锈钢卡套辉光离子渗氮温度可采用520℃,渗氮后渗层厚度为90μm,显微硬度为1317HV0.1。

The AISI304 austenitic stainless steel was treated by means of ion nitriding. Three different temperatures were employed （480℃, 520 ℃ ,580 ℃ ）for 8 h. The treated samples were examinated by means of optical microscopy and microhardness measurement. The results show that the nitride layer thickness increase as the treatment temperature increases and the microhardness values of the modified layer increase as the treatment temperature increases at first and above a certain temperature it decreases. Treated at 520℃, the AISI304 austenitic stainless steel can be obtained a favorable nitride layer with thickness of 90μm and microhardness value of 1317 HV0. 1.