Zn-induced liquid metal embrittlement and mechanical properties of advanced high-strength steel with resistance spot weld
Zn-induced liquid metal embrittlement and mechanical properties of advanced high-strength steel with resistance spot weld
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DOI：
10.1016/j.msea.2022.143088
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发表时间：
2022-04
期刊：
影响因子：
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通讯作者：
Xiao-nan Wang;Y. Xie;Zhenguang Liu;Qian Sun;Xinjun Shen;Qingyun Zhang;Zengrong Hu;R. Misra
中科院分区：
文献类型：
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作者：
Xiao-nan Wang;Y. Xie;Zhenguang Liu;Qian Sun;Xinjun Shen;Qingyun Zhang;Zengrong Hu;R. Misra
具有锌涂层的先进高强度钢（AHSS）通常通过使用电阻点焊（RSW）来连接。然而，钢/锌合金系统导致液态金属脆化（LME）的可能性。锌镀层对拉伸和疲劳塑性变形和断裂机制的作用尚未得到系统的研究。在这项研究中，LME和镀锌AHSS的力学性能进行了系统的研究，在热拉伸试验，通过使用裸和镀锌钢和搭接剪切和疲劳试验，利用RSW接头。实验结果表明，试样表面的锌层一旦出现，即破坏塑性变形，且锌层厚度与温度无关。在搭接剪切试验后，由于电极的倾斜，LME开裂出现在一侧。LME裂纹不影响疲劳试验的断裂过程，因为疲劳裂纹和LME裂纹位于相对侧。
Advanced high strength steels (AHSS) with zinc coatings are commonly jointed by using resistance spot welding (RSW). However, the steel/zinc alloy system causes the possibility of liquid metal embrittlement (LME). The role of zinc coatings on the plastic deformation and fracture mechanism of tensile and fatigue has not been systematically explored. In this study, the LME and mechanical properties of zinc-coated AHSS were systematically studied in terms of hot tensile tests by using bare and zinc-coated steel and lap-shear and fatigue tests utilizing RSW joints. The experimental results show that the zinc coating on the specimen surface damages the plastic deformation once the zinc coating appears, and the thickness of Zn coating remains constant regardless of temperature. LME cracking appears on one side due to the tilt of the electrode after the lap-shear test. The LME crack does not affect the fracture process of the fatigue test, as the fatigue crack and LME crack are located on opposite sides.