Effects of laser power density on static and dynamic mechanical properties of dissimilar stainless steel welded joints

作     者：Yan-Peng Wei Mao-Hui Li Gang Yu Xian-Qian Wu Chen-Guang Huang Zhu-Ping Duan 

作者机构：Key Laboratory of Hydrodynamics and Ocean EngineeringInstitute of MechanicsChinese Academy of Sciences The Quartermaster Equipment Research Institute of the General Logistics Department of PLA Key Lab of Mechanics in Advanced ManufacturingInstitute of MechanicsChinese Academy of Sciences The State Key Laboratory of Nonlinear MechanicsInstitute of MechanicsChinese Academy of Sciences 

出 版 物：《Acta Mechanica Sinica》 (力学学报（英文版）)

年 卷 期：2012年第28卷第5期

页      面：1334-1339页

核心收录：

学科分类：080503[工学-材料加工工程] 08[工学] 0805[工学-材料科学与工程（可授工学、理学学位）] 0802[工学-机械工程] 080201[工学-机械制造及其自动化] 

基　　金：supported by the National Natural Science Foundation of China (10832011) 

主　　题：Laser welding Dynamic mechanics Strain rate.Power density 

摘      要：The mechanical properties of laser welded joints under impact loadings such as explosion and car crash etc. are critical for the engineering designs. The hardness, static and dynamic mechanical properties of AISI304 and AISI316L dissimilar stainless steel welded joints by CO2 laser were experimentally studied. The dynamic strainstress curves at the strain rate around 103 s-1 were obtained by the split Hopkinson tensile bar （SHTB）. The static mechanical properties of the welded joints have little changes with the laser power density and all fracture occurs at 316 L side. However, the strain rate sensitivity has a strong depen- dence on laser power density. The value of strain rate factor decreases with the increase of laser power density. The welded joint which may be applied for the impact loading can be obtained by reducing the laser power density in the case of welding quality assurance.