氧化镧对高速钢组织与力学性能的影响  

Effects of La_2O_3 on microstructure and mechanical properties of high speed steel

作　　者：胡强[1,2] 陆德平[2] 樊自田[1] 刘鑫旺[1] 陆磊[2] 周喆[2] 付青峰[2] 

机构地区：[1]华中科技大学材料成型与模具技术国家重点实验室,湖北武汉430074 [2]江西省科学院江西省钨铜新材料重点实验室,江西南昌330029

出　　处：《金属热处理》2013年第12期30-34,共5页Heat Treatment of Metals

基　　金：国家科技支撑计划课题(2011BAC10B04)

摘　　要：采用电渣重熔工艺制备高速钢轧辊材料。借助光学显微镜、扫描电镜、摆锤冲击试验机和三点弯曲试验机研究La2O3对高速钢轧辊材料组织和力学性能的影响。结果表明,在电渣中加入La2O3能明显改变高速钢中共晶碳化物的形貌,大部分鱼骨状的共晶碳化物断开,颗粒状共晶碳化物增多,共晶碳化物分布更加均匀。在电渣重熔过程中加入La2O3能显著提高高速钢的冲击性能和抗弯强度,其冲击韧度由原来8.7 J/cm2增加到14.3 J/cm2,抗弯强度从1470 MPa提高到1847 MPa。High speed steel （HSS） roller material was prepared by electroslag remelting （ESR）. Effects of La2O3 addition on microstructure and mechanical properties of HSS were investigated by SEM, EDS, impact test and bending strength test. The results show that the morphology of eutectic carbides in HSS is obviously changed with La2O3 addition in slag of electroslag remelting, most of fishbone like eutectic carbides fractures, the amount of granular eutectic carbides increases, and the distribution of eutectie carbides becomes more uniform. Furthermore, the addition of La2O3 can increase the impact toughness and bending strength of HSS, the impact toughness increases from 8.7 J/cm2 to 14.3 J/cm2 and the bending strength increases from 1470 MPa to 1847 MPa.

关 键 词：LA2O3 电渣重熔 高速钢 组织 力学性能 

分 类 号：TG142.1[一般工业技术—材料科学与工程] TG156[金属学及工艺—金属材料]