(1. 中南大学 材料科学与工程学院，长沙 410083；2. 中南大学 机电工程学院，长沙 410083)
摘 要: 借助光学显微镜、扫描电镜和X射线衍射仪研究少量铈对高硼高速钢微观组织和力学性能的影响。结果表明：少量铈的添加能显著提高高硼高速钢的冲击韧性和磨损性能，其冲击韧性值(ak)由6.7 J/cm2增加到14.3 J/cm2，少量铈的存在使高硼高速钢中鱼骨状硼碳化物基本消失，大部分羽毛状硼碳化物熔断，粒状硼碳化物增多，硼碳化物分布更加均匀，初生奥氏体晶粒明显细化。
关键字: 高速钢；硼；铈；微观组织；冲击韧性
（1. School of Materials Science and Engineering, Central South University, Changsha 410083, China;2. School of Mechanical and Electrical Engineering, Central South University, Changsha 410083, China）
Abstract:The effects of small amount of Ce addition on the microstructure and mechanical properties of high-boron high speed steel were investigated by SEM, EDS and XRD. The results show that small addition of Ce can increase the impact toughness and the wear resistance of high-boron high speed steel, the impact toughness ak increases from 6.7 J/cm2 to 14.3 J/cm2. In the presence of small amount of Ce, fishbone boro-carbide disappears in the high-boron high speed steel, feathery boro-carbide melts and fractures, and granular boro-carbide increases, the distribution of boro-carbide becomes more uniform , and primary austenite grain is refined.
Key words: high speed steel; B; Ce; microstructure; impact toughness
