采用CO_2横流激光在40Cr钢表面熔覆不同配比的钴基合金粉末,采用摩擦磨损试验机测试试样的摩擦磨损性能。对摩擦系数以及耐磨性均较高的试样,采用微观分析及力学性能测试手段对熔覆层显微组织、物相、成分进行比较研究。结果表明:在现有实验条件下,激光熔覆层的强化相呈现网络状加弥散分布的颗粒状使裂纹或者缺陷的萌生门槛值增加,裂纹扩展速率减慢,导致钴基合金激光熔覆层的摩擦系数和耐磨性能的协同提高。 Cobalt-based alloy powders with different proportions were cladded on the surface of 40Cr steel by CO_2 cross-flow laser, and the friction and wear properties of the specimens were tested by a friction and wear tester. For the samples with high friction coefficient and high wear resistance, the microstructure, phase and composition of the cladding layer were compared by means of microanalysis and mechanical properties test. The results show that under the existing experimental conditions, the strengthening phase of the laser cladding layer presents network-like and dispersion-distributed granularity, which increases the threshold of initiation of cracks or defects and slows down the crack growth rate, resulting in the corrosion of the cobalt-based alloy laser cladding layer The synergistic improvement of the friction coefficient and wear resistance.