B<sub>4</sub>C对高碳铬铁自保护药芯焊丝力学性能的影响

B₄C对高碳铬铁自保护药芯焊丝力学性能的影响

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.