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用3 kW连续CO2激光器对矫直圈用9Cr2钢,在功率2.2 kW和扫描速度800 mm/m in条件下进行搭接量分别为1、2、3、4 mm的激光表面淬火。用金相显微镜、扫描电子显微镜以及显微硬度计,分析9Cr2钢激光表面淬火后的硬化层分布和剖面硬度均匀性。结果表明,9Cr2钢激光淬火后硬化层分布形状为部分搭接的两月牙形,搭接处硬化层深度随着搭接量的增大而增加,在第二道激光扫描带对第一道激光扫描带热影响区出现硬度下降区域,且随着搭接量的增大硬度下降趋势减弱。
A 3 kW continuous CO2 laser was used to straighten the coil with 9Cr2 steel and laser surface-hardened at 1, 2, 3 and 4 mm overlap with a power of 2.2 kW and a scanning speed of 800 mm / min respectively. The distribution of the hardened layer and the hardness uniformity of the hardened layer after 9Cr2 laser surface quenching were analyzed by metallographic microscope, scanning electron microscope and microhardness tester. The results show that the shape of the hardened layer after 9Cr2 laser quenching is a partially overlapped two-month tooth-shape, and the depth of the hardened layer at the lap joint increases with the lapping volume. When the second laser scanning zone irradiates the first laser The area with hardness decrease appears in the heat-affected zone and the hardness decreases with the increase of the amount of overlap.