奥氏体不锈钢离子氮化与离子软氮化的比较

Study on the Surface Properties of Ionitriding and Ionitrocarburising Austenitic Stainless Steel

文章对1Cr18Ni9Ti奥氏体不锈钢分别进行离子氮化与离子软氮化处理,工艺条件:处理温度480℃,处理时间8h,工作气压500Pa,工作电压800V,氨气流量1L/min;离子软氮化采用丙酮作为渗碳气氛,丙酮流量为0.01L/min。实验结果表明:离子氮化处理后渗层厚度为48μm,表面显微硬度为1310HV0.1;离子软氮化处理后渗层厚度为70μm,表面显微硬度为1286HV0.1,且离子软氮化比离子氮化渗层厚度更厚、硬度梯度更缓和。

The austenitic stainless steel 1Cr18Ni9Ti was treated by means of ionitriding and ionitrocarburizing.Ionitriding and Ionitrocarburizing were performed at the same temperature of 480℃ for 8 hours,using the same voltage of 800V,the same pressure of 500Pa and the same flow of ammonia gas of 1L/min.The acetone gas was employed as the carburizing gas with the flow of 0.01 L/min.The treated samples were characterized by means of optical microscopy and microhardness measurement.The depth and surface hardness of compound layer were 48μm and 1310 HV0.1 for ionitriding while the depth and surface hardness of compound layer were 70μm and 1286HV0.1 for ionitrocarburizing.The result indicates that a thicker and better hardness gradient compound layer can be obtained by ionitrocarburizing.