【摘要】 为了提高高温构件的热疲劳性能、减少表面裂纹,研究激光冲击对ZCuAl₁₀Fe₃Mn₂合金硬度、表面形貌、残余应力和热疲劳性能的影响。采用扫描电子显微镜（SEM）和能谱仪（EDS）分析合金的显微组织和裂纹形貌。结果表明:在4 J脉冲能量下,激光冲击能显著改善合金的热疲劳性能。在热应力和交变应力的作用下,试样缺口附近组织氧化而变得疏松多孔,促使萌生多条微裂纹。其中,竖直方向的微裂纹变为主裂纹,主要以裂尖前沿空洞连体的形式扩展;其他方向的微裂纹沿晶界生长而发生组织脱落现象。更多还原

【Abstract】 The effect of laser shock processing（LSP） on the hardness, surface morphology, residual stress, and thermal fatigue properties of a ZCuAl₁₀Fe₃Mn₂ alloy was investigated to improve the thermal fatigue performance and decrease the surface crack of high-temperature components. The microstructure and crack morphology were analyzed by scanning electron microscopy（SEM） and energy dispersive spectroscopy（EDS）. The results showed that laser shock could significantly improve the thermal fatigue performance of the alloy at a pulse energy of 4 J. Under the effect of thermal stress and alternating stress, microstructure around the specimen notch was oxidized and became porous, leading to the formation of multiple micro-cracks. The micro-cracks in the vertical direction became the main cracks, which mainly expanded with the conjoining of contiguous voids at the crack tip front. Micro-cracks in other directions grew along the grain boundaries and led to material shedding.更多还原