激光堆焊工艺对堆焊层组织性能的影响

Effect of mechanism and properties on technology of laser overlaying

在45钢的基体上,选用不同的激光功率、扫描速度、送丝速度等,用专用焊丝进行堆焊处理,结果表明当速度不变时,激光功率增加,其热影响区变大,组织由细变粗,硬度增加;当其它条件不变时,随着扫描速度的增加,堆焊层的稀释率下降,硬度增加,随着送丝速度的增加,堆焊层的组织均匀分布,硬度先增加,后下降.

A laser overlaying experiment was studied on 45 steel matrix with special alloy wire by using different laser power,scanning velocity and wire feed rate. The result shows that when the velocity is constant, with laser power increasing, the heating affected zone enlarges, the microstructure grain becomes smaller, and the hardness increases. And when other condition is constant ,with scanning velocity increasing, the rate of dilution discreases, hardness increases; and with wire feed rate increasing, the microstructure distributes uniform, the hardness first increases, and discreases at last.