激光熔覆与等离子熔覆的镍基合金熔覆层组织和性能对比

在低碳钢等廉价金属表面熔覆一层高强高韧或高耐蚀性的熔覆层可极大提高材料的使用性能及利用率,但是不同熔覆方法对熔覆层组织和性能可能会造成不同影响。利用激光熔覆和等离子熔覆技术分别在Q345基材表面熔覆镍基合金粉末,获得具有一定厚度的熔覆层。通过对2种熔覆方法获得的熔覆层进行微观组织、冲击韧性以及耐磨损性能对比分析可知,激光熔覆镍基合金的熔覆层组织细密,冲击吸收功略低于等离子熔覆试样,但稳定性优于等离子熔覆层,耐磨损性能及表面硬度明显优于等离子熔覆层。

Effect of Laser Cladding and Plasma Cladding on Microstructure and Properties of Nickel-Based Alloy Cladding Layer

The cladding layers with properties such as high strength and toughness and good corrosion resistance prepared on the surfaces of low-cost metals such as low carbon steels could greatly improved the performance and availability of materials. However,different cladding methods could cause different structures and performances of layers. Ni35 alloy powders were deposited on the surface of Q345 substrate by laser cladding and plasma cladding technology to obtain a cladding layer with a certain thickness. Through the comparative analysis of microstructure,toughness and wear resistance of different cladding layers obtained by laser cladding and plasma cladding,it can be found that the laser cladding layers had fine grains and slightly lower impact absorption powers than the plasma cladding layers,but their stability were better than the plasma cladding layers,and their wear resistance and surface hardness were obviously better.