【摘要】 利用２ｋＷＣＯ２激光器在Ａ３钢板上进行Ｎｉ基ＷＣ金属陶瓷的激光熔覆试验，研究了在不同工艺条件及碳化钨含量下熔覆层的开裂性能。结果表明，碳化钨金属陶瓷激光熔覆层中碳化钨本身成了裂纹产生与扩展的薄弱环节，但碳化钨含量较高时熔覆层裂纹率反而降低。试验结果还显示，不同碳化钨含量下，熔覆层的宏观裂纹数目随激光扫描速度的变化规律不同更多还原

【Abstract】 A 2 kW CO 2 laser has been used to deposit single tracks of Ni based WC alloy onto a steel A3 substrate. Effects of laser processing conditions and weight fractions of WC particles on the cracking tendency of coatings are studied. Results show that WC particles are the weak points of cracking in the laser cladding composite coatings, but when WC proposition is higher, the cracking numbers in composite coatings will decrease. Effects of laser traveling speed on the cracking tendency of coatings will be altered at various WC weight fractions.更多还原