Fe-Cr-V wear resistant hardfacing alloy

The Fe-Cr-V hardfacing alloy containing 0.9%-1.5%C, 13%-15%Cr and 1.0%-2.0%V was prepared for flux cored wire of submerged arc welding.The microstructure of hardfacing alloy was researched by means of optical microscopy, scanning electron microscopy, X-ray diffraction, etc.The effect of vanadium content and B₄C in flux core on the properties of surfacing alloy was also studied.The microstructures of hardfacing alloy consist of ferrite, martensite and carbide such as (Cr,Fe)₂₃C₆.The micro-analysis with electron spectrometer show that the content of chromium and vanadium in grain boundary is richer than those in transgranular and the gap becomes bigger as WC content in flux core increases.The carbides distributing along grain boundary such as (Cr,Fe)₂₃C₆ appear strip or discontinuous network form, which caused by the precipitation of vanadium carbide.It plays a role as the skeleton to prevent cutting wear of abrasive particles and refrains from the strong brittleness of network carbide.Comparing to the deposited alloy of H25Cr3Mo2MnV solid wire, the abrasion resistance of Fe-Cr-V alloy was more deliberately excellent.