In this study, the thermal and mechanical behaviors were investigated by simulating laser remelting of atmospheric plasma‐sprayed yttria‐stabilized zirconia coatings, and the molten depth and regions of stress concentration were compared between simulation and experiment. The heat treatment process of the remelted coating was also simulated. The crack formation mechanism in the YSZ coating remelted by laser and the heat‐treatment effect on residual stress were investigated. Results showed that the simulated results were consistent with the experimental measurements, and the residual thermal stress was the main cause of cracks formation. The coating remelted by a laser power of 1500 W and a scanning rate of 9 mm/s possessed less residual concentrated stress and segmented cracks. Heat treatment released concentrated stress, which was still accurate for the ceramic coating. If the coatings were slowly heated to demonstrate heat treatment after laser remelting, the cracks in the remelted layer decreased correspondingly.

中文翻译：

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激光重熔对氧化钇稳定氧化锆涂层热力学行为和热处理的研究

在这项研究中，通过模拟大气等离子体喷涂的氧化钇稳定的氧化锆涂层的激光重熔，研究了热和机械行为，并在模拟和实验之间比较了熔融深度和应力集中区域。还模拟了重熔涂层的热处理过程。研究了激光重熔YSZ涂层的裂纹形成机理以及热处理对残余应力的影响。结果表明，模拟结果与实验结果吻合，残余热应力是造成裂纹形成的主要原因。通过1500 W的激光功率和9 mm / s的扫描速度重熔的涂层具有较少的残余集中应力和分段裂纹。热处理释放了集中应力，对于陶瓷涂层仍然是准确的。如果在激光重熔后缓慢加热涂层以进行热处理，则重熔层中的裂纹相应减少。