齿面激光熔覆技术研究

Research on Laser Cladding Technology for Contact Surface of Gears

研究齿轮齿面激光熔覆粉末合金的工艺、显微硬度分布、熔覆层及过渡层等的金相组织及性能。结果表明，采用合适的合金粉末及激光熔覆工艺能够获得与基体呈冶金结合、无裂纹的熔覆层，显微硬度明显高于基体，且在熔覆的同时轮齿反面得到了淬硬。经齿轮试验机对比试验，齿轮齿面经激光熔覆后承受接触应力性能明显高于调质齿轮，可与高频表面淬火、渗氮处理的齿轮相媲美。

This paper deals with the technique of laser cladding on contact surface of gears, micro hardness distribution, microstructure and properties of cladding and transition layer. The results show that the flawless cladding layer which is melted with the base metal can be obtained by using some appropriate alloy powder and laser cladding technique. The microhardness of the cladding layer is much greater than that of the base metal. Moreover, non working surfaces of the gear is quenched during the course of cladding. The contrast test on the gear test machine shows that, in the contact strength, the cladded gear is superior to the hardened and tempered gears and can rival the high frequency hardening gears and the surface layer nitriding gears.