快速冷却对304奥氏体不锈钢低温气体渗碳强化的影响  

Effect of Rapid Cooling on Low Temperature Gaseous Carburization Strengthening of 304 Austenitic Stainless Steel

作　　者：李宣逸 巩建鸣[1,2] 彭亚伟 姜勇[1,2] LI Xuany;GONG Jianming;PENG Yawei;JIANG Yong(School of Mechanical and Power Engineering, Nanjing Tech, University, Nanjing 211816, China;Key Lab. of Design and Manufacture of Extreme Pressure Equipment, Nanjing 211816, China)

机构地区：[1]南京工业大学机械与动力工程学院,江苏南京211816 [2]江苏省极端承压设备与制造重点实验室,江苏南京211816

出　　处：《热加工工艺》2019年第4期170-173,共4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);江苏省普通高校学术学位研究生科研创新计划项目(KYZZ16_0234)

摘　　要：利用光学显微镜、X射线衍射仪、电子探针X射线微区分析仪、显微硬度计和残余应力分析仪研究了不同冷却速度下304奥氏体不锈钢低温气体渗碳后的性能。结果表明:渗碳后各试样表面均形成一层高硬度、高残余压应力的扩张奥氏体层,表面强化效果显著。经不同冷却速度处理后,试样表面的显微形貌、物相组成、碳浓度分布、硬度和残余应力均无明显差异,说明快速冷却对304奥氏体不锈钢低温气体渗碳强化并无影响。The properties of low-temperature gaseous carburized 304 austenite stainless steel after different cooling rates were investigated by optical microscope, XRD, electron probe X-ray microanalyzer, microhardness tester and residual stress analyzer. The results show that an expanded austenite layer with the characteristics of high hardness and high residual compressive stress is generated on the surface of each specimen after carburization, which has significant surface strengthening effect. However, there is no obvious difference in micro?morphology, phase composition, carbon concentration distribution, hardness and residual stress of the samples treated at different cooling rates, which indicates that rapid cooling has no influence on the low-temperature gaseous carburization strengthening of 304 austenite stainless steel.

关 键 词：低温气体渗碳 304奥氏体不锈钢 冷却速度 渗碳层 

分 类 号：TG156.8[金属学及工艺—热处理]