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首页> 外文期刊>Science and Technology of Welding and Joining >Understanding the factors controlling the interfacial failure strength of advanced high-strength steel resistance spot welds: hardness vs. fracture toughness
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Understanding the factors controlling the interfacial failure strength of advanced high-strength steel resistance spot welds: hardness vs. fracture toughness

机译：了解控制先进高强度钢铁抗焊点焊接的界面故障强度的因素：硬度与断裂韧性

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摘要

The failure of advanced high-strength steels' spot welds is a critical issue for automotive crash-worthiness. This paper deals with understanding the underlying factors of the tensile-shear strength of automotive steels' resistance spot welds during interfacial failure. It was found that the ratio of the fracture toughness to the hardness of the fusion zone is the critical factor governing the interfacial failure mechanism: ductile shear failure (controlled by the fusion zone hardness) vs. cleavage crack propagation (controlled by the fracture toughness). This clarification could pave the way for more accurate modelling of interfacial failure of advanced steel resistance spot welds and shed light on the design of proper post-weld heat treatment for improving the weld mechanical performance.
机译：先进的高强度钢材焊接失败是汽车崩溃的关键问题。 本文涉及在界面故障期间了解汽车钢抗性点焊的拉伸剪切强度的潜在因素。 发现断裂韧性与融合区硬度的比率是控制界面失效机制的关键因素：延展性剪切失效（由融合区硬度控制）与切割裂纹繁殖（由断裂韧性控制） 。 该澄清可以为更准确的钢电阻点焊和棚光进行更准确的界面故障建模，并在适当的焊接后热处理设计中提高焊接机械性能。

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