中锰铁基合金激光熔覆层组织性能研究

Research of Microstructure and Performance of Laser Cladding Fe-based Medium Manganese Alloy

利用6kW的IPG光纤激光器在42CrMo钢表面熔覆了中锰铁基合金粉末。采用OM、SEM、EDS、XRD及SRV4摩擦磨损试验机对熔覆层的组织及性能进行了研究。结果表明,熔覆层由熔覆区、结合区和热影响区三部分组成,其组织由下至上依次为平面晶、树枝晶和胞状晶;熔覆层显微硬度最大可达739HV,而基体硬度仅为251HV,硬度大幅提高;熔覆层相对磨损性是基体的2.57倍。

Fe-based medium manganese alloy coating was fabricated on 42CrMo steel surfaces using a synchronization powder feeding technique by 6 kW IPG laser apparatus. The microstructure and mechanical property were analyzed by X-ray diffrac-tometer （XRD）, scanning electron microscope （SEM）, microhardness tester and SRV4 system. The results showed that the coating is divided into three parts; coating, bonding and HAZ. The microstructures are planar crystal, dendrite crystal, cellu-lar crystal from bottom of the cladding to the top. The microhardness of the cladding layer is up to 739 HV, while that of the substrate is only 251 HV, the hardness incresses significantly. The abrasion performance of the cladding layer significantly im-proved, its relative wear resistance is 2.57 times of the substrate.