Carbide refinement in M42 high speed steel by rare earth metals and spheroidizing treatment  

稀土和球化热处理对M42高速钢碳化物尺寸的细化作用(英文)

作　　者：周雪峰[1,2] 方峰 涂益友[1] 蒋建清[1] 朱旺龙[2] 尹松艳 

机构地区：[1]东南大学江苏省先进金属材料高技术研究重点实验室,南京211189 [2]江苏省工模具钢工程技术研究中心,丹阳212312 [3]盛利维尔(中国)新材料技术有限公司,常州213200

出　　处：《Journal of Southeast University(English Edition)》2014年第4期445-448,共4页东南大学学报（英文版）

基　　金：The National Natural Science Foundation of China(No.51301038,51201031,51371050);the Industry-AcademiaResearch Cooperative Innovation Fund of Jiangsu Province(No.BY2014127-03);the Natural Science Foundation of Jiangsu Province(No.BK20141306);the Scientific and Technological Innovation Fund of Danyang(No.SY201305)

摘　　要：The influence of rare earth metals and heat treatment on the microstructure and performance of M42 steel has been investigated by means of an optical microscope OM scanning electron microscope SEM energy dispersive spectroscopy EDS transmission electron microscope TEM electron back-scatter diffraction EBSD and X-ray diffraction XRD . The results show that M2 C is the prevailing type of eutectic carbides in M42 steel. After modification with rare earth metals M2 C eutectic carbides change from the ordered lamellar structure into a circular structure.Despite different morphologies the two carbides present the same characteristics of microstructure and growth orientation.Compared with lamellar carbides M2 C carbides with the circular structure are much easier to decompose and spheroidize after heating which remarkably refines the carbide dimensions.The refined carbides improve the supersaturation of alloying elements in martensite and increase the hardness of M42 steel by 1.5 HRC.采用OM,SEM,EDS,TEM,EBSD,XRD等分析手段,研究了稀土和热处理对M42高速钢组织和性能的影响规律.结果表明,M2C是M42高速钢主要的共晶碳化物类型.稀土处理后,M2C共晶碳化物形貌由规则层片状变为不规则环状.尽管二者形貌差异明显,但具有相同的微观结构和晶体取向特征.与层片状碳化物相比,环状M2C共晶碳化物热稳定性较差,高温加热时更易发生分解和球化,使碳化物尺寸明显细化.小尺寸碳化物在淬火加热时易于溶解,提高了淬火后基体中合金元素的固溶度,使M42高速钢硬度增加了1.5 HRC.

关 键 词：high speed steel rare earth metals carbide dimension SPHEROIDIZATION 

分 类 号：TG1[金属学及工艺—金属学]