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用半导体激光器在45#钢表面激光熔覆4J36低膨胀合金涂层,采用正交试验方法研究激光功率、扫描速度、送粉率、搭接率等工艺参数对熔覆层表面裂纹及显微硬度的影响。结果表明:4种参数对熔覆层裂纹及显微硬度都有影响,其中激光功率对两指标影响最大,而搭接率影响最小;当激光功率为1 400 W、送粉率为25 g/min、扫描速度为270 mm/min、搭接率为45%时,熔覆层表面裂纹最少;当激光功率为1 400 W、送粉率为30 g/min、扫描速度为270 mm/min、搭接率为40%,熔覆层显微硬度最高,可达到457.2HV0.2。
The surface of 45 # steel was laser cladded with 4J36 low-expansion alloy coating by using semiconductor laser. The effects of laser power, scanning speed, powder feeding rate and overlap ratio on the surface crack and microhardness Impact. The results show that the four kinds of parameters have influence on the crack and microhardness of the cladding layer. The laser power has the greatest effect on the two indexes, but the lap effect has the least effect. When the laser power is 1 400 W and the powder feeding rate is 25 g / min, the scanning speed was 270 mm / min, the lapping rate was 45%, the surface cracks were the least. When the laser power was 1 400 W, the feeding rate was 30 g / min, the scanning speed was 270 mm / min, Lap ratio of 40%, the highest hardness of the cladding, up to 457.2HV0.2.