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利用金相显微镜、显微硬度计和残余应力分析仪研究了4个具有不同表面形貌的316L奥氏体不锈钢经低温气体渗碳处理后的渗碳层微观形貌、硬度和残余应力。结果表明:渗碳后各试样表面均形成一层高硬度、高残余压应力的渗碳层,表面强化效果显著。表面形貌对316L奥氏体不锈钢低温气体渗碳有一定影响。随着试样表面粗糙度的下降,渗碳处理后的硬度、残余应力和渗碳层厚度均降低,表面强化效果下降,并最终趋于稳定。
The microstructure, hardness and residual stress of carburized layer of four 316L austenitic stainless steels with different surface topographies were investigated by metallographic microscope, microhardness tester and residual stress analyzer. The results show that a carburized layer with high hardness and high residual compressive stress is formed on the surface of each sample after carburizing, and the surface strengthening effect is remarkable. The surface morphology of 316L austenitic stainless steel has a certain effect on carburizing at low temperature. With the decrease of surface roughness, the hardness, residual stress and carburized layer thickness decreased after carburization, the surface strengthening effect decreased, and eventually stabilized.