激光熔覆技术可以对失效的齿类件进行再制造，但是随着机械动力装置性能的大幅度提高，对激光再制造后齿类件的性能要求也越来越高。为了进一步提高激光再制造后齿类件的性能，采用活化屏等离子体氮化处理技术对Fe314激光熔覆层进行了复合处理，重点研究了活化屏等离子体氮化复合处理对激光熔覆层的表面硬度和抗接触疲劳性能的影响。试验结果表明，复合处理后Fe314激光熔覆层的表面硬度由540 HV提高到927 HV，Fe314激光熔覆层的接触疲劳寿命由2.42×105提高到4.94×105，复合处理后显著提高了Fe314激光层的表面硬度和接触疲劳性能。

Failure of gear parts can be remanufactured by laser cladding technique, but with the performance of mechanical powder device greatly improved, higher performance of laser remanufacturing gear parts are required. To further improve the performance of laser remanufacturing parts, Fe314 laser cladding coating is duplex treated by the active screen plasma nitriding technique. We focus on the influence of active screen plasma nitriding technique on the laser cladding coating hardness and contact fatigue performance. The results show that Fe314 laser cladding hardness increases from 540 HV to 927 HV and the contact fatigue life increases from 2.42×105 to 4.94×105 after duplex treatment. Obviously, duplex treatment can improve the surface hardness and contact fatigue performance of Fe314 laser cladding coating greatly.