硼含量对Fe-B-C合金组织和性能的影响  

Effect of Boron Content on the Structure and Property of Fe-B-C Alloy

作　　者：顾建[1] 张海滨[1] 符寒光[1] 雷永平[1] 

机构地区：[1]北京工业大学材料科学与工程学院,北京100022

出　　处：《铸造技术》2011年第10期1376-1379,共4页Foundry Technology

基　　金：国家自然科学基金(51054008)资助

摘　　要：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 microstructure and hardness of Fe-B-C alloys containing 0.5%~2.0%B were studied in as-cast and different quenching heat treated conditions.The experimental results showed that the as-cast Fe-B-C alloy containing 0.14%C and 0.50% B has simple structure and has no apparent eutectic boride with low hardness.When the boron content increased,the eutectic borides generated at the grain boundary,and the eutectic borides showed the distribution of network structure and with uniform grain.After quenching heat treatment,the eutectic borides network was broken.When the quenching temperature reached 950 ℃,the fracture of eutectic borides network was obvious.The microstructure of Fe-B-C alloy had no obvious growing up and the hardness reached 47 HRC,which was the optimal performance in present experimental conditions.As the quenching temperature increased further,the microstructure of Fe-B-C alloy began to grow up,and the hardness decreased slightly.While evaluating the microstructure and hardness of as-cast Fe-B-C alloy,the good overall performance of as-cast Fe-B-C alloy can be obtained as the boron content is 1.5% and quenching temperature is 950 ℃.

关 键 词：Fe-B-C合金 硼含量 淬火温度 显微组织 硬度 

分 类 号：TG135.6[一般工业技术—材料科学与工程]