B4C对高碳铬铁自保护药芯焊丝力学性能的影响
Effects of B4C on mechanical properties of high carbon ferrochrome self-shielded flux-cored wire
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摘要: 通过改变高碳铬铁中熔覆金属B4C的含量,分别考察了B4C对堆焊熔敷金属金相组织、硬度和不同载荷下耐磨性的影响,并对堆焊熔敷金属磨损形貌进行了分析。结果表明,随B4C含量的增加,初生碳化物的生长方向性越来越明显,成定向生长趋势,并且熔敷金属的宏观硬度逐渐增大,但B元素含量超过0.5%时,硬度变化趋缓;不同载荷磨损条件下,B4C强化的熔敷金属表现出耐磨性不同,堆焊熔敷金属耐磨面碳化物断裂或剥落少时,表现出良好的耐磨性,当碳化物大量断裂或剥落时,耐磨性变差。Abstract: The effect of B4C content on microstructures, hardness and wear resistance under multi-stress were researched respectively. The results indicated that the primary carbides grew directionally and the macrohardness of hardfacing layer was increased with the increment of B4C content.The wear resistance of hardfacing alloys presented different characteristics under different stress.When a few primary carbides had broken off, its wear resistance was better than those of hardfacing alloys which lot of primary carbides broke off.
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