药芯焊丝原位合成TiC复合涂层组织与性能

Microstructure and Performance of In-situ Synthesized TiC Particles Composite Coating Manufactured by Flux-cored Wires

以钛铁粉、石墨粉、还原铁粉等合金粉末为原料,采用药芯焊丝技术在Q235钢表面制备出TiC金属基耐磨堆焊涂层。通过药芯焊丝配方的研究设计,借助扫描电镜、能谱仪对涂层的显微组织进行分析,并且测试了涂层的微观硬度及湿砂磨损性能。结果表明,显微组织主要由原位合成的TiC、Fe基体相组成。原位合成的TiC颗粒大小约2μm,弥散均匀的分布在涂层中,涂层平均显微硬度820 HV0.2,相对耐磨性是Q235钢基体的13倍,具有良好的耐磨性能。

TiC particle composite coatings were in-situ synthesized on the surface of Q235 steel by submerged-arc welding using the mixtures of TiFe, graphite powders and Fe powers. Microstructures of the composite coating were observed by SEM, and wear resistance of the composite coating was evaluated by the sliding wear test machine at room temperature. The results show that composite coating consists of TiC particles and Fe matrix. The fine TiC particles distribute evently in the matrix, and the size of TiC particles is about 2 p,m. The micro-hardness of the coating is about 820 HV0.2. The wear mass loss of the Q235 material is 13 times more than of composite coating.