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采用药芯焊丝埋弧堆焊方法制备含有0.9%~3.0%C,15%~20%Cr,2.0%~3.0%V的高铬合金.借助光学显微镜、扫描电镜和X射线衍射等手段,研究其显微组织及碳化物分布形貌.结果表明,其显微组织由马氏体+铁素体+奥氏体+初生M7C3+(Fe,Cr)3C+TiC等相组成.通过优化药芯焊丝组份及调整堆焊速度,获得了沿堆焊表面垂直方向定向分布的初生M7C3型碳化物,电子能谱分析显示该碳化物为(Fe,Cr,V)7C3.此外,考察了碳含量对高铬堆焊合金硬度及耐磨粒磨损性能的影响.表明其耐磨性优良,其中15~25μm M7C3型初生碳化物颗粒有效阻碍磨粒的显微切削运动,显著改善了耐磨性.
A high chromium alloy containing 0.9% -3.0% C, 15% -20% Cr and 2.0% -3.0% V was prepared by submerged arc welding method of flux cored wire.Using the means of optical microscope, scanning electron microscopy and X-ray diffraction, Its microstructure and carbide distribution morphology.The results show that the microstructure consists of martensite + ferrite + austenite + primary M7C3 + (Fe, Cr) 3C + TiC phase, etc. By optimizing the flux cored wire Component and the welding speed were adjusted to obtain the primary M7C3 carbide distributed vertically along the surfacing surface. The electronic spectrum analysis showed that the carbide was (Fe, Cr, V) 7C3. In addition, High-chromium hardfacing alloy hardness and wear-resistant abrasive wear performance, indicating that its excellent wear resistance, of which 15 ~ 25μm M7C3 primary carbide particles effectively hinder the micro-cutting abrasive movement, significantly improved wear resistance.