Microstructure and Wear Resistance of Tungsten Carbide Particle Reinforced Ni - Based PTA Powder Surfacing Layer

Abstract

In order to study the microstructure and wear resistance of tungsten carbide particle reinforced nickel-based welding layer,three kinds of tungsten carbide particles were selected as the hard phase to mix with nickel-based alloy powder to conduct PTA (plasma transferred arc) powder surfacing contrast experiment.The microstructure of the welding layer was analyzed by metallographic microscope and scanning electron microscope,and the wear performance of the welding layer was tested by abrasive wear equipment.Results showed that in the plasma surfacing surfacing layer,tungsten carbide particles had different degrees of burn loss,spherical cast tungsten carbide particles had the most severe burn loss,and coarse-grain tungsten carbide particles had the lightest burn loss.Besides,the spherical cast tungsten carbide welding layer possessed the optimal wear resistance under the test abrasive wear conditions.

Keywords

• tungsten carbide powder|pta surfacing|microstructure|wear resistance