表面形貌对316L奥氏体不锈钢低温气体渗碳的影响  

Effect of Surface Morphology on Low-Temperature Gaseous Carburization of 316L Austenitic Stainless Steel

作　　者：余果[1] 巩建鸣[1] 荣冬松[1] 彭亚伟[1] 付明辉[1] 

机构地区：[1]南京工业大学机械与动力工程学院,江苏南京210000

出　　处：《热加工工艺》2017年第4期174-176,共3页Hot Working Technology

基　　金：国家自然科学基金资助项目(51475224);江苏省高校自然科学研究项目(14KJA470002)

摘　　要：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 low-temperature gaseous carburized 316L austenite stainless steel with four different surface morphologies were investigated by metallographic microscope,microhardness tester and residual stress analyzer. The results show that an carburized layer with the characteristic of high hardness and high residual compressive stress appears on the surface of each specimen, and the carburization has significant surface strengthening effect. The surface morphology has certain influence on low-temperature gaseous carburization of 316L austenite stainless steel. The hardness, residual stress and carburized layer depth of carburized specimens decrease with the surface roughness of the samples decreasing, and the effect of surface strengthening reduces, and then tends to be stable.

关 键 词：低温气体渗碳 316L奥氏体不锈钢 表面形貌 渗碳层 硬度 残余应力 

分 类 号：TG156.8[金属学及工艺—热处理]