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中文摘要：
为了研究激光熔覆层性能对活化屏等离子体氮化处理层耐磨性能的影响，采用两种铁基合金粉末（Fe90和Fe314）在45钢基体表面进行激光熔覆，然后进行等离子体氮化复合处理，测试涂层于摩擦条件下的磨损性能。研究结果表明：复合处理后，Fe90激光熔覆层的硬度由750HV提高到1350HV，Fe314激光熔覆层的硬度由540HV提高到927HV；在相同载荷（30N）下，Fe90复合处理层的耐磨性提高到1．2倍，而Fe314复合处理的耐磨性降低为原来的42％；复合处理耐磨性能提高的关键在于激光熔覆层与氮化层的合理搭配，熔覆层能够提供足够的支撑。
英文摘要：
In order to study effects of laser cladding layer performance on wear resistance of active screen plasma treating nitride coating, two kinds of Fe-based alloy powders, Fe314 and FegO, were adopted to laser clad on steel 45 substrate surface. And then the laser clads were duplex-treated by active screen plasma nitriding. Wear tests were carried out for the laser clads and duplex coatings with wear tester under dry sliding condition. Experimental results show that hardness of the Fe90 duplex coating was increased from 750HV of the Fe90 laser clad to 1350HV, and hardness of the Fe314 duplex coating was increased from 540HV of the Fe314 laser clad to 927HV. Under the same load （30N）, wear resistance of the Feg0 duplex coating was 1.2 times of that of the Fe90 laser cladding layer. However, wear resistance of the Fe314 duplex coating was only 0. 42 times of that of the Fe314 laser cladding layer. It can be found that the key problem for improving wear resistance of the duplex coating lies on reasonable combination of the laser cladding layer and active screen plasma treating nitride coating, the former should provide enough support for the latter.
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