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首页> 外文期刊>Materials Characterization >Liquid metal embrittlement in laser lap joining of TWIP and medium-manganese TRIP steel: The role of stress and grain boundaries
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Liquid metal embrittlement in laser lap joining of TWIP and medium-manganese TRIP steel: The role of stress and grain boundaries

机译：液体金属脆化在激光圈加入Twip和中锰旅行钢：压力和晶粒边界的作用

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摘要

High-Manganese austenite-containing steels with superior combination of strength and ductility have shown potential for enhancement of passenger safety and body-in-white (BIW) weight reduction. Even though Zncoated austenitic steels have improved corrosion resistance, they are highly susceptible to liquid metal embrittlement (LME) during welding. The present work is aimed to address LME susceptibility during restrained laser lap joining of high-Mn twinning induced plasticity (TWIP) and medium-Mn transformation induced plasticity (MMn-TRIP) steels. Electron probe micro-analysis (EPMA) results showed that stress-assisted diffusion of Zn into the austenite grain boundaries and further liquid Zn formation by a peritectic reaction lead to grain boundary decohesion. Electron backscatter diffraction (EBSD) results demonstrated that high angle and special grain boundaries are prone to Zn-penetration within the heat-affected-zone (HAZ). Additionally, LME sensitivity was observed to be highly dependent on the magnitude of applied stress.
机译：含有高锰矿石的钢具有优异的强度和延展性的组合，已经显示出增强乘客安全性和身体白色（BIW）重量的可能性。尽管锌涂覆的奥氏体钢具有改善的耐腐蚀性，但它们在焊接期间高度易受液态金属脆化（LME）的影响。本作本作的旨在在受限制的激光圈连接期间解决高MN Twinning诱导的塑性（TWIP）和中-MN转化诱导塑性（MMN-TRAP）钢的LME易感性。电子探针微分析（EPMA）结果表明，Zn的应力辅助扩散到奥氏体晶界和进一步的液体Zn形成通过包晶反应导致晶界衰落。电子反向散射衍射（EBSD）结果表明，高角度和特殊的晶界在热影响区（HAZ）内容易渗透到Zn渗透。另外，观察到LME敏感性高度依赖于施加应力的大小。

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