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利用CO_2激光器在45~#钢基体上熔覆Fe基合金,通过改变激光的扫描速度,分析了激光熔覆层的微观组织,测试了其显微硬度及磨损性能。结果表明,激光熔覆区为细小的树枝晶,组织均匀致密,随着扫描速度的增加,熔覆层的宽度呈下降趋势,熔覆层显微硬度是基体3.5倍。随着扫描速度的增加,熔覆层中颗粒相和合金元素的偏析减少,使硬度有所降低。
The microstructure of the laser cladding layer was analyzed by changing the laser scanning speed by CO 2 laser cladding on 45 ~ # steel substrate. The microhardness and wear resistance of the laser cladding layer were tested. The results show that the laser cladding zone is a fine dendrite with uniform and compact structure. With the increase of scanning speed, the width of the cladding decreases, and the microhardness of the cladding is 3.5 times that of the matrix. As the scanning speed increases, the segregation of the grain phase and alloying elements in the cladding layer decreases, resulting in a decrease in hardness.