42CrMo钢折弯模具激光表面强化

利用扫描电镜、电子背散射衍射技术等手段研究了42CrMo钢折弯模具的激光表面淬火特性。研究结果表明,激光扫描速度、功率、工件厚度等对淬硬层深度及硬度有显著影响。在激光功率2200 W、扫描速度1800 mm/min、光斑ϕ2 mm、辅助水冷、一道次扫描条件下,折弯模具刀刃硬度和淬硬层厚度分别达到734 HV0.2和1.05 mm,且刀刃两侧的硬度分布均匀。激光淬硬层组织为细小的马氏体,尤其靠近基体处。

Laser surface strengthening of 42CrMo steel for bending die

Laser surface quenching characteristics of bending die made of 42CrMo steel were studied by means of SEM and EBSD. The results show that the laser scanning speed, power and workpiece thickness have significant influence on the depth and hardness of the hardened layer. Under the condition of 2200 W laser power, 1800 mm/min scanning speed, 2 mm of spot diameter, auxiliary water cooling and one pass scanning, the hardness and hardened layer thickness of the bending die blade reach 734 HV0.2 and 1.05 mm respectively, and the hardness distributions are uniform on both sides of the blade. The microstructure of the laser hardened layer was fine martensite, especially near the substrate.