(1. 中南大學 材料科學與工程學院，長沙 410083；2. 中南大學 機電工程學院，長沙 410083)
摘 要: 借助光學顯微鏡、掃描電鏡和X射線衍射儀研究少量鈰對高硼高速鋼微觀組織和力學性能的影響。結(jié)果表明：少量鈰的添加能顯著提高高硼高速鋼的沖擊韌性和磨損性能，其沖擊韌性值(ak)由6.7 J/cm2增加到14.3 J/cm2，少量鈰的存在使高硼高速鋼中魚骨狀硼碳化物基本消失，大部分羽毛狀硼碳化物熔斷，粒狀硼碳化物增多，硼碳化物分布更加均勻，初生奧氏體晶粒明顯細化。
關(guān)鍵字: 高速鋼；硼；鈰；微觀組織；沖擊韌性
（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
