Abstract The effect of single peak overload on the crack propagation of selective laser melting Inconel 625 superalloy was investigated in this study. Irwin model and Shih model were used to calculate the plastic zone size. And Irwin model was in good agreement with experimental results. A model considering two plastic zone size weight was proposed. By comparison with the calculated results of theoretical models and microscopic analyses, it was demonstrated that the plastic zone size at the crack tip is the main reason for single tensile overload-induced crack retardation of selective laser melting Inconel 625.

中文翻译：

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单次拉伸过载对选择性激光熔化Inconel 625高温合金疲劳裂纹扩展行为的影响

摘要 研究了单峰过载对选择性激光熔化Inconel 625高温合金裂纹扩展的影响。Irwin 模型和 Shih 模型用于计算塑性区尺寸。并且 Irwin 模型与实验结果吻合较好。提出了一个考虑两个塑性区尺寸权重的模型。通过与理论模型计算结果和显微分析的对比表明，裂纹尖端塑性区尺寸是选择性激光熔化Inconel 625单次拉伸过载诱导裂纹延迟的主要原因。