11Cr超纯铁素体不锈钢管焊缝开裂原因分析  

The Analysis for Weld Cracking of Stainless Steel Pipe of 11Cr Ultra Pure Ferrite

作　　者：顾佳卿[1,2] 李鑫[1] 许海刚[1] 毕洪运[1] 

机构地区：[1]东北大学材料冶金学院,辽宁沈阳110006 [2]宝钢股份研究院不锈钢技术中心,上海200431

出　　处：《物理测试》2011年第1期27-30,共4页Physics Examination and Testing

摘　　要：通过使用宏观观察、金相分析、断口分析和电子背散射衍射(EBSD)等分析手段对高频焊管焊后弯管开裂的原因进行了分析。结果表明焊缝区域晶粒内部的位错的胞状组织和未完成多边形化的亚晶是导致汽车排气管焊缝区域韧性下降、硬度升高的原因,最后在弯管成型时,焊缝处受到拉应力导致开裂。从焊缝处发现的晶粒内存在的大量的未完成多边形化的亚晶这一现象推断出问题所在,通过改进,消除了弯管成型开裂的情况。The cause for bent pipe fracture after high frequency welding was analyzed using macroscopic observation, metallographic technology, fracture analysis and EBSD technology. The results show that dislocation cellular structure and the unfinished subgrains of polygonization are the reasons that cause the decreasing of ductility and the rising of hardness; and the weld joint cracked because of the tensile stress when the pipe was bended. The place where the processing set-up was wrong can be reduced from analysis above and the cracking problem was able to be eliminated after improvement.

关 键 词：铁素体不锈钢 亚晶 多边形化 开裂 

分 类 号：TF764.1[冶金工程—钢铁冶金]