Laser cladding is widely used for feature repair and manufacturing of large structural components. However, due to processing parameters and thus energy densities variation, defects can form in laser clad materials. There is a need to understand the relationship between energy densities and cladding quality. This study therefore investigates the critical parameters in producing structural Stellite ® 21 (Co-Cr-MoNiC) alloy by laser cladding. Compared with conventional manufacturing, laser clad materials possess ultrafine α-Co dendrites and σ-CoCr interdendritic eutectics due to the fast cooling rate. In addition, adjustment of the energy densities can help control defects and improve corrosion resistance. The wear resistance, microhardness, and phase analysis in the laser clad materials are also discussed in this work.

中文翻译：

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激光熔覆 Stellite® 21 合金的加工可行性、显微组织演变和机械性能

激光熔覆广泛用于大型结构部件的特征修复和制造。然而，由于加工参数和能量密度的变化，激光熔覆材料中可能会形成缺陷。需要了解能量密度和包层质量之间的关系。因此，本研究调查了通过激光熔覆生产结构性 Stellite ® 21 (Co-Cr-MoNiC) 合金的关键参数。与传统制造相比，激光熔覆材料由于冷却速度快，具有超细的α-Co枝晶和σ-CoCr枝晶间共晶。此外，能量密度的调整有助于控制缺陷和提高耐腐蚀性。本工作还讨论了激光熔覆材料的耐磨性、显微硬度和相分析。