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激光辅助冷喷涂(LCS)工艺是一种新的涂层和制造工艺,它结合了冷喷涂的固态沉积、保持原有粉末成分、高沉积效率优势,能够沉积冷喷涂难以或不可能沉积的材料。以N2气作为高压载气,在中碳钢基体材料上采用LCS沉积Stellite 6粉末颗粒。采用金相、SEM以及EDX对沉积层进行表征,分析了激光加热的沉积点温度和N2温度对沉积层的表面形貌、沉积厚度和沉积密度的影响。结果表明:激光加热导致的沉积点温度越高,沉积表面起伏越大,颗粒撞击形成的凹陷越深,粉末沉积层越厚;沉积层的致密度与沉积点温度和N2温度有关。在氮气压力3 MPa,工件进给速度为15 mm/s的条件下,氮气温度450℃,沉积点温度1 100℃时,沉积层质量最好。
The Laser Assisted Cold Spray (LCS) process is a new coating and manufacturing process that combines cold spray solid deposition, maintaining the original powder composition, high deposition efficiency, the ability to deposit materials that are difficult or impossible to deposit by cold spray . Using N2 gas as a high pressure carrier gas, Stellite 6 powder particles were deposited on medium carbon steel substrate by LCS. The deposited layer was characterized by metallography, SEM and EDX. The effects of laser heating deposition temperature and N2 temperature on the surface morphology, deposition thickness and deposition density of the deposited layer were analyzed. The results show that the higher the deposition temperature caused by laser heating is, the larger the deposition surface undulation is. The deeper the depression formed by particle impact, the thicker the powder deposition layer. The density of deposition layer is related to deposition temperature and N2 temperature. Under the conditions of nitrogen pressure of 3 MPa and workpiece feed rate of 15 mm / s, the deposition quality is best when the nitrogen temperature is 450 ℃ and the deposition temperature is 1 100 ℃.