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采用CO2激光器在60CrMnMo钢表面进行激光陶瓷合金化,保持激光功率、搭接率不变,研究了扫描速度和预涂层厚度对合金化层的组织与硬度的影响。利用OM、SEM、显微硬度计对激光合金化层的组织和横截面显微硬度分布进行研究。结果表明,激光合金化层与基体形成了冶金结合,随扫描速度的增加,合金化层厚度减小,合金化层硬度先提高后降低。随预涂层厚度的增加,合金化层硬度也提高。当激光功率为4000 W,搭接率为30%～40%,光斑尺寸为3～3.5 mm,预涂层厚度为30～35μm,扫描速度为2.0 m/min时,合金化层的平均显微硬度最高为1101 HV0.2,是基体材料(250 HV)的4.4倍左右。
The laser ceramic alloying was performed on the surface of 60CrMnMo steel with CO2 laser to maintain the laser power and the lap-over ratio. The effects of scanning speed and pre-coating thickness on the microstructure and hardness of the alloyed layer were studied. The microstructure and cross-section microhardness distribution of laser alloying layer were studied by OM, SEM and microhardness tester. The results show that the laser alloying layer forms a metallurgical bond with the substrate. With the increase of the scanning velocity, the thickness of the alloying layer decreases and the hardness of the alloying layer first increases and then decreases. With the pre-coating thickness increases, the alloying layer hardness also increased. When the laser power is 4000 W, the overlap rate is 30% ~ 40%, the spot size is 3 ~ 3.5 mm, the pre-coating thickness is 30 ~ 35μm and the scanning speed is 2.0 m / min, the average microstructure of the alloyed layer The highest hardness is 1101 HV0.2, 4.4 times that of the base material (250 HV).