A thermal damage analysis model of metal components with surface microstructure under laser irradiation is established. In order to ensure the influence law, the surface microstructure of metal component is simplified to periodic patterns. The light field and temperature distribution on the metal surface are calculated. And then the damage threshold of the component with different surface structure is calculated. The results show that the damage threshold of metal surface decreases with the increasing of the microstructure period. At the same structural period, the damage threshold of the linear structure is lower than which of the punctate structure.

中文翻译：

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表面微观结构对金属材料热损伤特性的影响

建立了激光辐照下具有表面微观结构的金属零件的热损伤分析模型。为了确保影响规律，将金属部件的表面微观结构简化为周期性图案。计算金属表面上的光场和温度分布。然后计算出不同表面结构的零件的损伤阈值。结果表明，随着显微组织周期的增加，金属表面的损伤阈值降低。在相同的结构时期，线性结构的损伤阈值低于点状结构的损伤阈值。