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采用等离子喷焊技术在Q235钢表面制备了Fe55合金喷焊层。借助金相显微镜、X射线衍射仪、显微硬度计、摩擦磨损试验机,研究了不同VC添加量下喷焊层的显微组织、物相、硬度变化及磨损性能。结果表明:未添加VC时喷焊层表层组织主要由团状马氏体、奥氏体组成;添加VC后组织转变为针状马氏体+Fe-Cr相,且大量白色颗粒状VC、V_2C和白色块状Cr_7C_3、Cr_(23)C_6等碳化物弥散分布于基体之中,形成韧基体+硬质相组织。随VC含量的增加,喷焊层的硬度及摩擦系数先增加后下降。当VC添加量达10%时,喷焊层的显微硬度最高,较未添加VC时提高了约300 HV0.5,摩擦系数最低,磨损量最小。
Plasma spray welding technology was used to prepare Fe55 alloy spray coating on the surface of Q235 steel. The microstructure, phase, hardness and wear properties of sprayed coatings with different amount of VC were studied by metallographic microscope, X-ray diffraction, microhardness tester and friction and wear tester. The results show that the surface structure of spray coating is mainly composed of clumpy martensite and austenite when VC is not added, and the microstructure changes to acicular martensite + Fe-Cr phase after addition of VC, and a large amount of white granular VC and V_2C And white massive Cr_7C_3, Cr_ (23) C_6 and other carbides dispersed in the matrix, forming a tough matrix + hard phase structure. With the increase of VC content, the hardness and friction coefficient of spray coating first increase and then decrease. When the addition amount of VC is 10%, the microhardness of the sprayed coating is the highest, about 300 HV0.5 compared with that without VC, the friction coefficient is the lowest and the wear is the least.