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研究了含0.5%～2.0%B的Fe-B-C合金在铸态和热处理态下组织和硬度的变化规律。试验结果表明,硼含量为0.5%及碳含量为0.14%的Fe-B-C铸态合金,显微组织结构简单,无共晶硼化物生成,硬度低。随着硼含量的继续增加,在晶界处生成共晶硼化物,呈网状结构分布,晶粒度不均匀。经淬火处理后,网状结构出现断网,当淬火温度达到950℃时,断网明显,组织并无粗化现象,硬度达到47HRC,此时性能为实验条件下最优。随着淬火加热温度的升高,热处理组织粗大,硬度略有下降。以显微组织和硬度为评价标准时,硼含量为1.5%,淬火温度为950℃,综合性能较好。
The variation of microstructure and hardness of Fe-B-C alloy containing 0.5% -2.0% B under as-cast and heat-treated conditions was studied. The experimental results show that the microstructure of Fe-B-C as-cast alloy with 0.5% boron and 0.14% carbon is simple, with no eutectic borides and low hardness. As boron content continues to increase, eutectic borides are formed at the grain boundaries and are distributed in a network structure with non-uniform grain size. After quenching, the network structure appears broken network, when the quenching temperature reaches 950 ℃, the broken network significantly, the organization does not coarsening phenomenon, the hardness reaches 47HRC, at this time the performance under the optimal experimental conditions. With the quenching heating temperature increases, the heat treatment of coarse tissue hardness slightly decreased. With the microstructure and hardness as the evaluation criteria, boron content of 1.5%, quenching temperature of 950 ℃, the overall performance is better.