摘要
分别采用ERNiCrMo-3镍基合金焊丝和ER309不锈钢焊丝,通过钨极惰性气体保护(TIG)焊工艺对SUS316L不锈钢和15CrMo低合金钢进行异种钢焊接,对比研究了2种焊接接头的显微组织和力学性能。结果表明:采用ERNiCrMo-3与ER309焊丝所得焊缝的凝固模式分别为奥氏体与奥氏体-铁素体凝固模式,凝固组织分别为完全奥氏体组织与奥氏体-铁素体混合组织;相较于ER309焊丝,使用ERNiCrMo-3焊丝可以抑制15CrMo钢侧焊接过程中的碳元素扩散,获得具有更高抗拉强度和断后伸长率的焊接接头;2种焊接接头的峰值硬度均出现在15CrMo钢侧的粗晶热影响区,采用ERNiCrMo-3焊丝所得焊缝因存在Laves相,硬度比采用ER309焊丝时高出30 HV左右。
Dissimilar steel welding was carried out on SUS316L stainless steel and 15CrMo low-alloy steel by tungsten inert gas(TIG) welding with nickel base alloy welding wire ERNiCrMo-3 and stainless steel welding wire ER309.The microstructure and mechanical properties of the two welded joints were studied and compared.The results show that the solidification modes of the welds obtained with ERNiCrMo-3 and ER309 welding wires were austenitic and austenite-ferrite solidification modes,respectively,and the solidification structures were complete austenitic and mixed austenite-ferrite structures,respectively.Compared with using ER309 welding wire,using ERNiCrMo-3 welding wire could inhibit the diffusion of carbon in the welding process on 15CrMo steel side,and obtain a welded joint with higher tensile strength and percentage elongation after fracture.The peak hardness of the two welded joints appeared in the coarse-grained heat affected zone on 15CrMo steel side.Due to Laves phase in the weld obtained with ERNiCrMo-3 welding wire,the hardness was about 30 HV higher than that with ER309 welding wire.
作者
李亚杰
刘涛
洪磊
洪亮
黄爱颐
LI Yajie;LIU Tao;HONG Lei;HONG Liang;HUANG Aiyi(School of Materials Engineering,Jiangsu University of Technology,Changzhou 213001,China;Jiangsu Beite Pipe Fittings Co.,Ltd.,Taizhou 225500,China;Taizhou Branch of Jiangsu Special Equipment Safety Supervision and Inspection Institute,Taizhou 225599,China)
出处
《机械工程材料》
CAS
CSCD
北大核心
2023年第10期43-49,共7页
Materials For Mechanical Engineering
基金
国家自然科学青年基金资助项目(51601078)
江苏省政府留学奖学金项目(JS-2019-322)。
关键词
镍基合金焊丝
不锈钢焊丝
异种钢焊接
力学性能
显微组织
nickel base alloy welding wire
stainless steel welding wire
dissimilar steel welding
mechanical property
microstructure