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对AISI431马氏体不锈钢进行低温等离子体改性处理,通过金相观察、X射线分析等对渗层组织结构进行表征,利用显微硬度仪以及腐蚀极化曲线等对渗层硬度和耐蚀性能进行测试。结果表明,通过低温改性处理,均可在不锈钢表面获得含有“膨胀”α相的渗层,其中渗氮处理后表面主要含Fe4N和含氮“膨胀”α相,渗碳处理后表面主要为含碳“膨胀”α相,且渗氮层厚度明显大于渗碳层厚度。经低温改性处理后,不锈钢表面硬度显著提升,且渗氮层硬度高于渗碳层硬度。然而,在本试验条件下渗氮渗碳的不锈钢耐蚀性能均略有下降,和渗氮相比,渗碳处理后的试样耐蚀性能更差,且在腐蚀过程中,两类渗层表面所产生钝化膜均为具有n型半导体特性。
The AISI431 martensitic stainless steel was modified by low temperature plasma, and the microstructure and microstructure of the infiltrated layer were characterized by metallographic observation and X-ray analysis. The hardness and corrosion resistance of the infiltrated layer were measured by microhardness tester and corrosion polarization curve carry out testing. The results show that the infiltrated layer containing “expanded” alpha phase can be obtained on the surface of stainless steel by low temperature modification treatment. The surface after nitriding contains mainly Fe4N and nitrogen containing “expanded” alpha phase, and the carburizing treatment The back surface is mainly carbon-containing “expanded ” alpha phase, and the nitrided layer thickness is significantly greater than the carburized layer thickness. After low temperature modification treatment, the surface hardness of stainless steel significantly improved, and nitriding layer hardness higher than the carburized layer hardness. However, the corrosion resistance of the nitrided carburized stainless steel decreased slightly under the test conditions. Compared with the nitriding, the corrosion resistance of the carburized stainless steel after the carburizing treatment was worse. During the corrosion process, The passivation films produced on the surface all have n-type semiconductor properties.