中文摘要：

在Fe-Cr-C系高Cr铸铁型堆焊焊丝中加入Mo元素制成自保护药芯焊丝,通过热力学平衡计算,理论分析了Mo对高碳高铬系堆焊材料的强化机理。结果表明：Mo元素的添加,可以增加堆焊层中初生碳化物的数量,细化合金组织,在强化碳化物的同时强化基体。通过试验的方法对比分析了Mo元素对高Cr铸铁型堆焊材料显微组织和力学性能的影响,当加入2%Mo时,堆焊熔覆层的质量明显好于不含Mo的材料,同时堆焊层平均硬度值提高了12.5%,添加Mo元素焊丝堆焊制备的复合材料的常温冲击韧性是未添加Mo元素的1.9倍。

英文摘要：

Adding Mo into the Fe-Cr-C high chromium cast iron welding wire, the self-shielded flux cored wire was produced. The strengthening mechanisms of adding Mo into high-carbon and high chromium surfacing materials was studied based on thermodynamic equilibrium calculation. The results show that Mo can increase the number of primary carbides, and refine the microstructure of alloy; not only strengthen the carbide, but also the matrix. The effect of adding Mo into the high-Cr iron-based surfacing material on the microstructure and mechanical properties was studied by experimental methods. When adding 2% Mo, the welding quality of cladding layer is better than Mo-free material, while the average hardness increases by 12.5%, and the impact toughness increases to 1.9 times compared with no Mo.