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2h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4h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.
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