电脉冲处理对W6Mo5Cr4V2高速钢的影响  

Influence of Electric Current Pulse Treatment on W6Mo5Cr4V2 High Speed Steel

作　　者：邹磊[1] 武颖[1] 岑启宏[1,2] 

机构地区：[1]昆明理工大学材料科学与工程学院,昆明650093 [2]固体废弃物资源化国家工程研究中心,昆明650033

出　　处：《材料工程》2016年第2期23-27,共5页Journal of Materials Engineering

基　　金：国家自然科学基金面上项目(51171073);高等学校博士学科点专项科研基金(20115314120002)

摘　　要：研究电脉冲处理对铸态W6Mo5Cr4V2高速钢组织的影响及其机理,利用光学显微镜、XRD和EDS观察成分和微观组织的变化。结果表明:铸态高速钢的微观组织主要由MC,M_2C和M_7C_3碳化物和马氏体、奥氏体、珠光体混合组成,碳化物在晶界处呈连续的网状分布,存在部分鱼骨状共晶碳化物;经过脉冲电流处理后,碳化物的物相种类未发生变化,但形态上由网状趋向于断裂,有明显的孤立和球化趋势,鱼骨状共晶碳化物消失,同时,碳化物含量减少,而基体中合金元素含量增加,基体的硬度提高。焦耳热和电磁力偶合物理效应是造成这些现象的主要机理。The influence and mechanism of electric current pulse on the cast W6Mo5Cr4V2 high speed steel microstructure were studied. The changes of its composition and microstructure were observed by using optical microscopy, X-ray diffraction（XRD） and energy spectrum analysis（EDS）. The results show that the microstructure of the cast HSS is mainly composed of MC, M2C and M7C3 eutectic carbides, martensite, austenite and pearlite. The carbides exhibit continuous network distribution along grain boundaries, and there are some herringbone-like eutectic carbides. After being treated by the electric current pulse,the carbides have no change, but appear differently, from the network carbide tending to fracture, and with obvious trend of isolation and spheroidizing, the herringbone-like eutectie carbides disappear, meanwhile, the content of the carbide decreases, the content of the alloy elements in the matrix increases, the hardness of the matrix is improved. Joule heat and electromagnetic force coupling physical effect are the main mechanism of these phenomena.

关 键 词：脉冲电流 高速钢 碳化物 硬度 

分 类 号：TG142[一般工业技术—材料科学与工程]