不锈钢与耐热钢焊接过渡区的碳迁移现象分析  

Analysis on migration phenomena of carbon in welding transition region between stainless steel and heat-resistant steel

作　　者：李德元[1] 娄建新[1] 王晓宇[1] 张晶[1] 谢天男[1] 

机构地区：[1]沈阳工业大学材料科学与工程学院,沈阳110870

出　　处：《沈阳工业大学学报》2012年第5期491-495,514,共6页Journal of Shenyang University of Technology

基　　金：沈阳市科技攻关项目(F10-011-2-00)

摘　　要：为了在理论上对不锈钢和耐热钢异种钢焊接碳迁移过程进行定量分析,针对熔合区产生的碳迁移现象,首先根据化学位梯度将碳元素的实际浓度转换为等效浓度,利用菲克定律对扩散过程进行了计算.根据计算结果推导出碳扩散理论公式并绘制理论曲线,利用电子扫描显微镜对垂直于熔合线的方向进行成分分析并绘制实际碳扩散曲线.结果表明:理论曲线与实测曲线基本相同.通过这种方法可较为准确地推导出碳迁移的趋势,为今后异种钢碳扩散计算提供了理论基础.In order to carry out the quantitative analysis on the migration process of carbon during the welding of dissimilar steels such as both stainless steel and heat-resistant steel and aiming at the carbon migration phenomena occurred in the fusion area,the actual concentration of carbon was firstly converted into the equivalent concentration according to its chemical potential gradient,and then the calculation for the diffusion process was performed with Fick＇s law.According to the calculated results,the theoretical formula for the diffusion of carbon was derived,and the theoretical diffusion curves were drawn.The component analysis along the direction perpendicular to the fusion line was performed with scanning electron microscope,and the actual diffusion curves of carbon were drawn.The results show that the theoretical and measured curves are basically the same.With the present method,the migration trend of carbon can be derived more accurately.It means that the proposed method can provide the theoretical basis for investigating the diffusion of carbon in dissimilar steels.

关 键 词：异种钢焊接 扩散 碳迁移 增碳层 脱碳层 熔合区 菲克定律 成分分布 

分 类 号：TG406[金属学及工艺—焊接]