Study on Microstructure and Performance of Fe-C-B-V Wear Resistant Surfacing Layer by Plasma Arc Clading

Fe-C-B-V iron-based alloy was cladded on the surface of Q345 steel by plasma arc surfacing technology, using ferroboron, high carbon chromium iron and ferrovanadium as raw materials.The microhardness and impact toughness of the surfacing layer were measured by using the Vickers hardness and impact test machine, respectively.The results show that the microstructure of the surfacing layer is mainly composed of martensite, grid shaped Fe₃ (C, B) and Fe₂B, the dispersal distribution of carbides and borides (e.g VB₂, VC and Cr₂B).The average hardness of the surfacing layer is up to 904.58 HV10, its impact energy is 68.5 J.The carbides and borides formed during surfacing welding ascribe to improve the hardness and wear resistance of the surfacing layer, meanwhile, the formed vanadium carbide makes the microstructure change from fishbone to grid, refining the grain, then, the impact toughness of the surfacing layer improves.