目的 在NiCr20TiAl基体材料上进行镍基纳米TiN电沉积复合镀后再开展激光重熔工艺，研究激光重熔参数对其镀层表面质量、结合力及硬度的影响。方法 采用正交实验，研究不同激光重熔参数（扫描速率、搭接量、离焦量等）对重熔镀层的影响，采用显微硬度计、扫描电镜和划痕仪进行硬度、表面形貌和结合力检测，得到较优工艺参数。结果 通过控制重熔参数对镀层表面能量和表面形貌的影响，以降低表面性能差异，得到激光重熔较佳工艺参数为：电流115A，脉宽为8ms，频率为10Hz，离焦量15mm，扫描速度230mm/min，使获得的镀层表面形貌比较平整，结合力提高到＞60N，硬度值平均632HV，并且硬度分布均匀。结论 激光重熔工艺可消除纳米复合电沉积过程中产生的间隙，纳米复合镀层致密均匀，镀层与基体之间产生良好的冶金结合，镀层表面硬度分布均匀，机械性能趋近一致。

Objective Nickel-based nano TiN composite deposition layers were remelted by laser process.The effects of laser remeltign parameters on the surface quality, binding force and hardness were researched. Method Orthogonal experiments that different laser remelting parameters(scan rate,amout of overlap,defocus amount,etc) were applied and influences were analysed on the remelted coating to obtain optimum process parameters by using microhardness, SEM and scratch tester to detect hardness, surface morphology and binding force.Result By controlling the remelting parameters on the coating surface energy and surface topography in order to reduce the differences in surface properties, preferably laser remelting process parameters were electric current 115A,pulse width of 8ms,frequency of 10Hz,dofocus amount 15mm,and the scanning speed of 230mm/min to obtain smooth surface topography, binding force up to ＞60N, the average hardness values 632HV, and hardness distribute uniform.Conclusion Laser remelting process can eliminate the gap produced by nano composite deposition, and nano composite layer become compact and uniform. A good metallurgical bond can be formed between the layer and substrate, the layer surface hardness distributed uniform and the mechanical properties approach consistent.