Ultra-high-speed laser cladding, which refers to metal deposition at speeds > 20 m/min or rates of 120 cm2/min, is an emerging technique that extends the conventional laser cladding process envelope without compromising the coating quality. This research investigates the effects of the laser energy density (2.56–15.00 J/mm2) and powder stream focal position relative to the substrate (0.2–0.8 mm) on the clad layer thickness and as-deposited microstructure of Stellite® 6 coating on mild steel substrate. The laser energy density was found to be the dictating factor affecting the coating thickness, chemical composition, as-deposited microstructure, and overall coating quality. The powder stream focal position above the substrate surface determined the heated powder volume above the substrate, leading to increased coating thickness. The clad layer thickness can be controlled via changing the laser energy density and powder stream focal position.

中文翻译：

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Stellite® 6 合金在低碳钢上的超高速激光熔覆

超高速激光熔覆是指以 > 20 m/min 或 120 cm2/min 的速率进行金属沉积，是一种新兴技术，可在不影响涂层质量的情况下扩展传统的激光熔覆工艺范围。本研究调查了激光能量密度 (2.56–15.00 J/mm2) 和粉末流焦点位置相对于基材 (0.2–0.8 mm) 对 Stellite® 6 涂层的包覆层厚度和沉积微观结构的影响。钢基材。发现激光能量密度是影响涂层厚度、化学成分、沉积态微观结构和整体涂层质量的决定因素。基材表面上方的粉末流焦点位置决定了基材上方的加热粉末体积，从而导致涂层厚度增加。