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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。
Adding Mo into the Fe-Cr-C high Cr cast iron cladding wire to make self-shielded flux cored wire, the mechanism of Mo strengthening on high-carbon high-chromium surfacing materials was theoretically analyzed through thermodynamic equilibrium calculation. The results show that the addition of Mo can increase the amount of primary carbides in the surfacing layer, refine the alloy structure and strengthen the matrix while strengthening the carbides. The influence of Mo element on the microstructure and mechanical properties of high Cr cast iron surfacing material was analyzed by the experimental method. When 2% Mo was added, the quality of surfacing layer was obviously better than that of Mo-free material. Meanwhile, The average hardness of the surfacing layer increased by 12.5%. The toughening toughness of the composite prepared by surfacing with Mo element welding wire was 1.9 times higher than that of Mo without surfacing.