Repair of Gear by Laser Cladding Ni60 Alloy Powder: Process, Microstructure and Mechanical Performance

As the main mechanical transmission parts, gears are usually exposed to wear, corrosion, and fatigue; their failure in a poor working environment may cause huge economic loss waste of resources. Laser cladding (LC) has been proven quickly repair parts at good metallurgical bonding performance flexible scanning strategies wide material selection. Therefore, LC technology can be considered an ideal approach repairing damaged gear. However, teeth by not systematically reported. In this paper, series progressive works have carried out investigate process broken LC. Firstly, parameters, overlapping ratio, Z-increment for Ni60 powder on 20CrMnTi were optimized. Secondly, effects deposition morphologies single-layer multi-layer multi-tracks carefully analyzed. Then, gear was successfully realized based obtained optimized parameters. Finally, phase composition, microstructure, hardness, wear properties repaired tooth analyzed XRD, SEM, microhardness tester, friction tester. The results show that remanufactured recover its appearance before breakage. zone is mainly composed γ-Ni, Cr7C3, Cr23C6, CrB phases. micro-hardness volume 60.63 ± 1.23HRC 1674.983 μm2, which consistent with those other teeth. This study expected expand application provide guidance engineers parts.