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采用药芯焊丝自保护明弧方法在Q235A基体上制备了高铬耐磨层。通过光学显微镜、扫描电镜、X-射线衍射仪和显微硬度计分析研究了TiC对堆焊合金层显微组织和性能的影响。结果表明,随着药芯焊丝中TiC含量增加,母材稀释作用减弱,堆焊层因成分稀释所产生的富铬α-Fe固溶体、网状或者树枝状碳化物等显著减小直至消失,并降低了堆焊合金层的各向异性。此外,湿砂磨粒磨损试验和表面磨损形貌分析结果表明,加入一定量的TiC可改善明弧堆焊合金的耐磨性,其磨损机理主要为微观剥落。
High-chromium wear-resistant layer was prepared on the Q235A substrate by using the flux-cored wire self-protecting bright arc method. The effects of TiC on the microstructure and properties of the deposited alloy layer were investigated by optical microscope, scanning electron microscopy, X-ray diffraction and microhardness tester. The results show that with the increase of TiC content in the flux-cored wire, the dilution of the base metal is weakened, the chromium-rich α-Fe solid solution, net-like or dendritic carbide produced by the component dilution is significantly reduced and disappeared, and Reduce the anisotropy of surfacing alloy layer. In addition, the results of wet sand abrasive wear test and surface wear morphology analysis show that adding a certain amount of TiC can improve the wear resistance of bright-arc surfacing alloy, and the wear mechanism is mainly micro-spalling.