摘要
To evaluate themetallurgical properties of ERNiCrMo-4 and ER304 welding wires in the Hastelloy C276 and 316 L stainless steel lap-welded joints,the analyses of microstructure,hardness,element distribution and mechanical properties were conducted.The results indicate that the Fe-rich zone was found at joint which added ER304 wire.The weld metals(WM)in two types of joints both consist of dendritic crystal and center equiaxed crystal.Besides,a large number of inter-dendrite precipitates were confirmed as p phase andμphase.A transition zone was found at the interface between WM and 316 L base metal as a result of dilution.The WM near the interface has the highest hardness due to the fine crystals here.In the joint added with ERNiCrMo-4,a large quantity of carbides causes a stress concentration and becomes the source of cracks,resulting in a reduction in shear strength.The fracture mode in all shear samples is ductile fracture.
作者
Xu Tao
Wang Zishun
Shi Yonghua
徐涛;王子顺;石永华(School of Mechanical and Automotive Engineering,South China University of Technology,Guangzhou 510640,China)
基金
gratefully acknowledge the financial support for this work from the Key Research and Development Program of Guangdong Province(Grant No.2020B090928003)
Natural Science Foundation of Guangdong Province(Grant No.2020A1515011050)。
