Microstructure homogeneity and mechanical properties of laser-arc hybrid welded AZ31B magnesium alloy

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外文摘要：Laser-arc hybrid welding of AZ31B magnesium alloy was carried out,the effects of welding parameters on weld formation,microstructure homogeneity and mechanical properties were investigated.The results showed that laser-arc hybrid welding was beneficial to improve the weld formation of magnesium alloy by inhibiting the defect of undercut and pores.The weld microstructure was mainly columnar grains neighboring the fusion line and equiaxed grains at the weld center.It was interesting that the grain size at the upper arc zone was smaller than that at the low-er laser zone,with the difference mainly affected by laser power rather than welding current and welding speed.The welding parameters were optimized as laser power of 3.5 kW,welding current of 100 A and welding speed of 1.5 m·min-1.In this case,the weld was free of undercut and pores,and the tensile strength and elongation rate reached 252 MPa and 11.2％,respectively.Finally,the microstructure homogeneity was illustrated according to the heat distribution,and the evolution law of tensile properties was discussed basing on the weld formation and micro-structure characteristics.

外文关键词：

Magnesium alloyLaser-arc hybrid weldingMicrostructure homogeneityMechanical properties

作者：

Yongkang Gao、Kangda Hao、Lianyong Xu、Yongdian Han、Lei Zhao、Wenjing Ren、Hongyang Jing

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作者单位：

School of Materials Science and Engineering,Tianjin University,Tianjin 300350,China

Tianjin Key Laboratory of Advanced Joining Technology,Tianjin 300350,China

基金：

National Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaNational Natural Science Foundation of China

项目编号：

519053915202505251975405

出版年：

2024

DOI：

10.1016/j.jma.2022.09.034

镁合金学报(英文)

ISSN：2213-9567

年,卷(期)：2024.12(5)