Effect of laser bionic treatment on fatigue crack growth behavior of TIG welded AZ31B magnesium alloy joint

•Grains of weld joint has refined by laser bionic treatment (LBT).•Fatigue behavior was correlated with ‘soft-hard’ alternating structure formed by LBT.•Roles of LBT in fatigue resistance improvement were discussed. In this study, laser bionic treatment (LBT) was utilized to improve the fatigue crac...

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Bibliographic Details
Published inMaterials letters Vol. 320; p. 132334
Main Authors Meng, Chao, Zhang, Zhengqiang, Yang, Juntao, Zhuang, Weibin, Shi, Haifang
Format Journal Article
LanguageEnglish
Published Amsterdam Elsevier B.V 01.08.2022
Elsevier BV
Subjects
Bionics
Crack propagation
Fatigue
Fatigue failure
Fractography
Fracture mechanics
Laser beam welding
Laser bionic
Magnesium alloy
Magnesium base alloys
Materials science
Strengthening
Welded joints
Welding
Fatigue
Laser bionic
Welding
Fractography
Magnesium alloy
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Summary:•Grains of weld joint has refined by laser bionic treatment (LBT).•Fatigue behavior was correlated with ‘soft-hard’ alternating structure formed by LBT.•Roles of LBT in fatigue resistance improvement were discussed. In this study, laser bionic treatment (LBT) was utilized to improve the fatigue crack growth behavior (FCGB) of AZ31B magnesium alloy welded joints. After LBT, fine equiaxed grains with random orientations were achieved on welded joints. Meanwhile, gradient structure and surface strengthening layer with ‘soft-hard’ alternating structure were achieved on welded joints, and fatigue crack growth threshold was significantly increased, and fatigue crack growth rate was significantly decreased. LBT results in changes of FCGB and fracture mode, and can affect all stages of crack growth. In addition, the mechanism of strengthening fatigue was analyzed based on microstructure, fracture and structural characteristics.
ISSN:0167-577X
1873-4979
DOI:10.1016/j.matlet.2022.132334