原位生成(Fe,Cr)_7C_3/Fe表面复合材料的组织  

Microstructure of (Fe,Cr)_7C_3/Fe surface composite prepared by in-situ reaction

作　　者：赖玉军 许云华[2] 叶芳霞[2] 王崇[2] 

机构地区：[1]西安建筑科技大学机电工程学院,陕西西安710055 [2]西安理工大学材料科学与工程学院,陕西西安710048

出　　处：《材料热处理学报》2015年第10期22-27,共6页Transactions of Materials and Heat Treatment

基　　金：国家科技计划项目对俄科技合作专项(2014DFR50630);国家高技术研究发展计划(863计划)项目(2013AA031803);国家自然科学基金(51374169);陕西省科学技术研究发展计划项目工业攻关计划(2014K08-13)

摘　　要：采用铸渗—热处理法将纯铬板与TH300进行原位反应制备了(Fe,Cr)7C3/Fe表面复合材料。应用XRD、SEM和显微硬度计对不同保温时间所得的表面复合材料进行物相、显微组织和显微硬度进行了分析。结果表明:随着保温时间的增加,显微组织逐渐由网状的(Fe,Cr)3C型碳化物逐渐转变为颗粒状和板条状的(Fe,Cr)7C3型碳化物。当1185℃保温2 h后在铬板与基体结合处生成了整块状致密(Fe,Cr)7C3陶瓷层,其体积分数达90%以上,当1185℃保温4 h后整块状致密(Fe,Cr)7C3陶瓷层消失。(Fe,Cr)7C3/Fe表面复合材料的显微硬度值为1478 HV0.1,约是灰铸铁基体微硬度的5倍。（ Fe,Cr）7C3/ Fe surface composite was prepared by in situ synthesis method plus subsequent heat treatment with pure chromium plate and TH300. The phase,microstructure and microhardness of the composite were analyzed by XRD,SEM and microhardness tester.The results show that the microstructure can be changed from network（ Fe,Cr）3C carbide to granular and lath-shaped（ Fe,Cr）7C3carbide with the increase of holding time. The（ Fe,Cr）7C3bulk ceramic is produced in the interface between chromium plate and gray cast iron at1185 ℃ for 2 h. The volume fraction of（ Fe,Cr）7C3bulk ceramic is more than 90%. The（ Fe,Cr）7C3bulk ceramic can finally disappear after holding at 1185 ℃ for 4 h. The microhardness of（ Fe,Cr）7C3/ Fe surface composite is 1478 HV0. 1,which is nearly 5 times higher than that of the gray cast iron.

关 键 词：表面复合材料 原位生成 显微组织 显微硬度 

分 类 号：TB331[一般工业技术—材料科学与工程]