Abstract The suitability of a post-weld heat treatment is often measured in terms of reducing residual stress and/or ensuring hardness homogeneity. Here we use digital image correlation to quantify the localised deformation behaviour of laser-welded Eurofer-97 both with and without a normalising and tempering heat treatment. This is coupled with detailed microscopic analysis to investigate the mechanisms for the localised plasticity measured. We show that although the heat treatment ensures hardness homogeneity, there remains variation in grain size, texture, carbide morphology/density and tensile behaviour across the weld. Accordingly, deformation is heterogeneous under tension, even in the ‘uniform elongation’ regime. To capture this behaviour, a quantification of strain heterogeneity throughout the test provides a new measure of performance that indicates the suitability of both microstructure and macroscopic performance for engineering applications.

中文翻译：

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激光焊接 Eurofer 的变形不均匀性

摘要 焊后热处理的适用性通常通过降低残余应力和/或确保硬度均匀性来衡量。在这里，我们使用数字图像相关性来量化激光焊接 Eurofer-97 的局部变形行为，无论是否经过正火和回火热处理。这与详细的微观分析相结合，以研究测量的局部可塑性的机制。我们表明，尽管热处理确保了硬度均匀性，但焊缝的晶粒尺寸、质地、碳化物形态/密度和拉伸行为仍然存在差异。因此，即使在“均匀伸长”状态下，变形在张力下也是不均匀的。为了捕捉这种行为，