【摘要】 研究了含1.5%B、3.0%Cr和0.3%C的Fe-Cr-B合金的铸态组织,以及淬火工艺对合金显微组织和硬度影响。结果表明,Fe-Cr-B合金凝固组织为珠光体、铁素体、共晶硼化物和二次硼碳化合物。淬火后基体转变为马氏体,硼化物类型无变化。在900~1100℃淬火后,硬度先增加后减小,硼化物断网趋势越来越明显。与水冷相比,油冷后硼化物更细小,阻碍裂纹扩展。更多还原

【Abstract】 The solidification microstructure of Fe-Cr-B alloy containing 1. 5% B,3% Cr and 0. 3% C was analyzed,and the effects of quenching temperature and cooling rate on microstruture and hardness of the alloy were investigated. The results show that the microstructure of as-cast Fe-Cr-B alloy is composed of pearlite,ferrite,eutectic boride and secondary borocarbide. After quenching,the matrix of alloy transforms to lath martensite,and the type of boride has no any change. Quenched at 900-1100 ℃,the hardness firstly increases and then decreases,while the phenomenon of network breaking become more and more bovious. Compared with the watercooling,the boride is smaller after oil-cooling. It reduces the ability of crack propagation.更多还原