为了检测激光淬火过程中CO₂激光束能量的空间分布变化,研究不同激光模式对激光淬火硬化层均匀性的影响,采用基于焦热电相机的在线激光束分析仪实时监测激光淬火过程中的激光束模式。结果表明,由于激光能量密度空间分布的不均匀,导致光斑左右两侧硬化层深浅不一致。从显微组织发现,硬化组织结构的均匀性和激光束模式有着非常紧密的关系,均匀的激光能量分布产生较为均匀的组织。

In order to examine the variation of CO₂ laser beam mode profile,and analyze the effect of different laser modes on the uniformity of quenching hardened layers,a pyroelectric camera-based industrial inline laser beam analyzer was installed to monitor the laser beam profiles in real-time during the laser quenching process.Results showed that due to the ununiformity of the laser power intensity in spatial distribution,the depth of the hardened layer at either side of the beam spot differed obviously.In addition,it was found the microstructures of laser quenching layers were dominated by laser beam modes and uniform power distribution resulted in uniform microstructures.