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Formation mechanism of liquid metal embrittlement in laser lap welding of zinc-coated GEN3 steels

机译：锌涂层Gen3钢激光轧焊液金属脆化的形成机理

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摘要

Liquid metal embrittlement (LME) was observed in the laser lap welds of zinc-coated GEN3 steels. When line energy input ranged from 54 kJ/m to 60 kJ/m, the LME crack initiated from the weld edge at the faying interface, propagated along the growth direction of columnar grains and extended upwards along the weld centerline, exhibiting an inversed Y-shape. Multiple Fe-Zn phases such as α-Fe (Zn), Γ-Fe_3Zn_(10) and 6-FeZn_(10) were created by liquid zinc in grain boundaries reacting with the austenite matrix during the cooling stage of the laser welding process. Those hard and brittle Fe-Zn phases, especially r-Fe_3Zn_(10), deteriorated the grain boundary cohesion and led to crack initiation. Simulation results indicate that a weld profile being deep with partial penetration will result in a high stress concentration at the notch root during the LME active temperature range. Therefore, full penetration welding is recommended to reduce the risk of LME by enabling zinc vapor to escape from both the top and bottom of the keyhole.
机译：在锌涂覆的Gen3钢的激光搭接焊缝中观察到液态金属脆化（LME）。当线能量输入范围为54 kJ / m至60kJ / m时，从卸料界面处的焊接边缘发起的LME裂纹沿柱状晶粒的生长方向传播并沿焊接中心线向上延伸，呈现反向的Y-形状。通过在激光焊接过程的冷却阶段在冷却阶段，通过液体锌在激光焊接工艺的冷却阶段反应的晶界中，产生多种Fe-ZN相，例如α-Fe（Zn），γ-Fe_3zN_（10）和6-FezN_（10）。那些硬质和脆性的Fe-Zn阶段，尤其是R-Fe_3zN_（10），使晶界粘合劣化并导致开采裂纹。仿真结果表明，在LME主动温度范围内，焊接轮廓深度渗透深的凹陷型材将导致凹口根部的高应力浓度。因此，建议通过使锌蒸汽从匙孔的顶部和底部逸出来降低LME的全渗透焊接。

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  • 来源
    《Materials Science and Engineering》 |2021年第7期|140229.1-140229.12|共12页
  • 作者

    Yuanjing Zhu; Hui-Ping Wang; Yaqi Wang; Yu Hao; Blair E. Carlson; Fenggui Lu;

  • 作者单位

    Shanghai Key Laboratory of Materials Laser Processing and Modification School of Materials Science and Engineering Shanghai Jiao Tong University Shanghai 00240 PR China;

    General Motors Company Warren Ml 48090 USA;

    Shanghai Key Laboratory of Materials Laser Processing and Modification School of Materials Science and Engineering Shanghai Jiao Tong University Shanghai 00240 PR China;

    Shanghai Key Laboratory of Materials Laser Processing and Modification School of Materials Science and Engineering Shanghai Jiao Tong University Shanghai 00240 PR China;

    General Motors Company Warren Ml 48090 USA;

    Shanghai Key Laboratory of Materials Laser Processing and Modification School of Materials Science and Engineering Shanghai Jiao Tong University Shanghai 00240 PR China;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    Liquid metal embrittlement (LME); Laser lap welding; Fe-Zn phases; Stress; Weld profile;

    机译：液态金属脆化（LME）;激光焊接;Fe-Zn阶段;压力;焊接型材;

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