铌对60Si2Mn弹簧钢表面脱碳敏感性的影响  

Effect of Niobium on Surface Decarburization Sensitivity of 60Si2Mn Spring Steel

作　　者：赵东宇[1,2] 雍岐龙[2] 杨庚蔚[1,2,3] 孙新军[2] 李昭东[2] 张正延[2] 

机构地区：[1]昆明理工大学材料科学与工程学院,云南昆明650093 [2]钢铁研究总院工程用钢研究所,北京100081 [3]武汉科技大学材料与冶金学院,湖北武汉430081

出　　处：《钢铁》2014年第5期74-80,共7页Iron and Steel

基　　金：国家973计划资助项目(2010CB630805)

摘　　要：采用金相法测量了不同铌含量的弹簧钢60Si2Mn的脱碳层深度,系统研究了铌及其含量对60Si2Mn弹簧钢表面脱碳敏感性的影响。研究结果表明:添加铌元素可以有效降低60Si2Mn的脱碳敏感性,但脱碳层深度并未随铌含量的微量增加而降低。利用Thermo-Calc DICTRA软件对不同温度下碳在奥氏体中的扩散系数进行了计算,考虑了铌及其他合金元素对碳的扩散影响。通过菲克第二定律获得了试验钢中脱碳层深度随温度的变化规律,并与实测值相吻合。为研究其他微合金元素对脱碳层的影响提供了一种更为有效的手段。The decarburization layer of spring steels with different Nb contents were measured by metallographic microscopic method, the effect of niobium and its content on the surface decarburization sensitivity of 60Si2Mn spring steel was systematically investigated. The results show that niobium can effectively reduce the decarburization sensitivity of 60Si2Mn spring steel. However, the depth of the decarburization does not decrease with the niobium content further increases. The diffusion coefficients of carbon in austenite in different temperatures were calculated by means of Thermo-Calc DICTRA software in which the effects of niobium and other elements on diffusion of carbon in austenite were considered. And the variation of decarburizing depths of the experimental steels was calculated by the Fick＇s second law. It agrees with the measured data and can be used to investigate the effects of other alloying elements on the decarburization more effectively.

关 键 词：弹簧钢 60SI2MN 铌 脱碳敏感性 扩散系数 

分 类 号：TG142.1[一般工业技术—材料科学与工程]