Ultrasonic-assisted metal inert gas(U-MIG)welding experiments were performed to analyze the effect of Cu addition on the microstructure and mechanical properties of galvanized steel sheet welds,and first-principles ca...Ultrasonic-assisted metal inert gas(U-MIG)welding experiments were performed to analyze the effect of Cu addition on the microstructure and mechanical properties of galvanized steel sheet welds,and first-principles calculations were undertaken to predict the effect of Cu on the mechanical properties ofα-Fe based structures.As shown by scanning electron microscopy analysis,Cu is conducive to the refinement and uniformity of the microstructure in the weld zone.Energy-dispersive spectrometry data indicated the presence of Cu in the welds after welding with Cu powder.The elastic moduli of the welds without and with Cu powder,obtained from nanoindentation tests,were(217.66±5.11)GPa and(223.13±9.12)GPa,respectively,which were close to the calculated results.The mechanical properties of the crystal structures ofα-Fe andα-Fe_(1.9)Cu_(0.1)were calculated using Materials Studio software.Both the experimental and calculated results showed that Cu doping reduced the bulk modulus of the weld but increased its shear modulus.展开更多
基金the National Natural Science Foundation of China(No.51665037)the Open Fund of the Key Laboratory of Lightweight and High Strength Structural Materials of Jiangxi Province(No.20171BCD40003)the Open Fund of Key Laboratory of Nondestructive Testing Ministry of Education,Nanchang Hangkong University of China(No.EW201980090)。
文摘Ultrasonic-assisted metal inert gas(U-MIG)welding experiments were performed to analyze the effect of Cu addition on the microstructure and mechanical properties of galvanized steel sheet welds,and first-principles calculations were undertaken to predict the effect of Cu on the mechanical properties ofα-Fe based structures.As shown by scanning electron microscopy analysis,Cu is conducive to the refinement and uniformity of the microstructure in the weld zone.Energy-dispersive spectrometry data indicated the presence of Cu in the welds after welding with Cu powder.The elastic moduli of the welds without and with Cu powder,obtained from nanoindentation tests,were(217.66±5.11)GPa and(223.13±9.12)GPa,respectively,which were close to the calculated results.The mechanical properties of the crystal structures ofα-Fe andα-Fe_(1.9)Cu_(0.1)were calculated using Materials Studio software.Both the experimental and calculated results showed that Cu doping reduced the bulk modulus of the weld but increased its shear modulus.
