Effect of Cu Addition on the Microstructure and Mechanical Properties of U-MIG Welds on Galvanized Steel Sheets

doi:10.1007/s12204-021-2328-y

Abstract

Abstract: Ultrasonic-assisted metal inert gas (U-MIG) welding experiments were performed to analyze the effectof Cu addition on the microstructure and mechanical properties of galvanized steel sheet welds, and first-principlescalculations were undertaken to predict the effect of Cu on the mechanical properties of α-Fe based structures.As shown by scanning electron microscopy analysis, Cu is conducive to the refinement and uniformity of themicrostructure in the weld zone. Energy-dispersive spectrometry data indicated the presence of Cu in the weldsafter welding with Cu powder. The elastic moduli of the welds without and with Cu powder, obtained fromnanoindentation tests, were (217.66 ± 5.11) GPa and (223.13 ± 9.12) GPa, respectively, which were close to thecalculated results. The mechanical properties of the crystal structures of α-Fe and α-Fe1.9Cu0.1 were calculatedusing Materials Studio software. Both the experimental and calculated results showed that Cu doping reducedthe bulk modulus of the weld but increased its shear modulus.

Key words: weld, Cu powder, first-principles calculations, galvanized steel sheet, microstructure, properties

CLC Number:

YU Xiaokang (俞小康), YE Jia (叶佳), WU Chunxiang (吴春祥), MA Guohong∗ (马国红). Effect of Cu Addition on the Microstructure and Mechanical Properties of U-MIG Welds on Galvanized Steel Sheets[J]. J Shanghai Jiaotong Univ Sci, 2021, 26(6): 757-764.

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