Fe-Cr-V耐磨堆焊合金

制备了用于埋弧焊药芯焊丝的Fe-Cr-V堆焊合金,其成份(质量分数,%)为c0.9～1.5,Cr 13～15,V 1.0-2.0.借助光学显微镜、扫描电镜和X射线衍射等手段,研究了其显微组织,并考察V和B4C含量对该堆焊合金性能的影响.Fe-Cr-V堆焊合金的显微组织由铁素体 马氏体 (Cr,Fe)23C6等碳化物组成.电子能谱微区分析显示Cr,V元素晶界含量显著高于晶内,随WC加入量提高,晶界与晶内含量差距增大.由于沿晶界析出碳化钒,这使(Cr,Fe)23C6等晶界碳化物呈条状或断续网状分布,起到耐磨骨架作用,避免了网状形态的强烈脆性.结果表明,其磨粒磨损性能显著优于实心焊丝H25Cr3Mo2MnV堆焊合金.

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.