碳化物析出对ENiCrFe-3预边堆焊异种钢焊缝力学性能影响的数值模拟  

Numerical study of the effect of carbide precipitation on the mechanical properties of ENiCrFe-3 pre-edge welded dissimilar steel welds

作　　者：樊佳伟[1,2] 李卓轩 吴昊盛 刘光银 张建晓 黄健康[2] FAN Jiawei;LI Zhuoxuan;WU Haosheng;LIU Guangyin;ZHANG Jianxiao;HUANG Jiankang(Gansu Tobacco Industry Co.,Ltd,Lanzhou 730050,China;Lanzhou University of Technology,Lanzhou 730050,China;Lanzhou LS Equipment Co.,Ltd.,Lanzhou 730300,China)

机构地区：[1]甘肃烟草工业有限责任公司,兰州730050 [2]兰州理工大学,兰州730050 [3]兰州兰石重型装备股份有限公司,兰州730300

出　　处：《焊接学报》2023年第6期67-73,I0007,共8页Transactions of The China Welding Institution

基　　金：国家自然科学基金资助项目(52175324)。

摘　　要：为避免异种钢焊接中的元素扩散富集现象,文中采用预边堆焊ENiCrFe-3过渡层的方法,实现了异种钢的良好焊接,但在焊接接头中发现了碳化物的析出现象,进而采用晶体塑性有限元方法,构建了晶界处添加碳化物的晶体塑性有限元分析模型.模拟结果表明,碳化物析出相会对晶粒内部与晶界上的应力应变分布产生显著影响,由于碳化物含量增加,夹杂物的区域应力集中增大,三晶粒交点是焊缝力学性能最薄弱的区域,晶界交汇处应力分布不对称,通常最先失效,成为断裂源.In order to avoid the phenomenon of element diffusion enrichment in the welding of dissimilar steels,this paper uses the method of pre-edge overlay welding ENiCrFe-3 transition layer to achieve a good weld of dissimilar steels,but the precipitation of carbide was found in the welded joint,and then the crystal plasticity finite element method was used to construct a crystal plasticity finite element analysis model with the addition of carbide at grain boundaries.Simulation results show that:carbide precipitation phase will have a significant effect on the stress-strain distribution within and on the grain boundaries,due to the increase in carbide content,the stress concentration increases in the region of inclusions,the threegrain intersection is the weakest region of the mechanical properties of the weld,and the stress distribution at the intersection of the grain boundaries of the three grains is asymmetric and usually the first to fail and become a source of fracture.

关 键 词：晶体塑性学 碳化物 有限元 应力应变 

分 类 号：TG407[金属学及工艺—焊接]