灰铸铁与铬棒原位生成(Fe,Cr)7C3 / Fe复合材料
(Fe,Cr)7C3 / Fe Composite In-situ Synthesized by Cast Iron and Cr Bar
刘新成, 许云华, 钟黎声, 叶芳霞
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作者单位：(西安建筑科技大学 机电工程学院 耐磨材料研究所, 陕西 西安 710055)
中文关键字： 原位反应； (Fe，Cr)7C3； 颗粒增强； 复合材料
英文关键字：in-situ synthesis; (Fe ,Cr)7C3; particle reinforcement; composite
中文摘要：利用铸渗复合-热处理原位反应工艺，将铬棒与灰铸铁进行铸造复合， 并对其进行热处理使铬棒与铸铁基体中的碳原子发生原位反应，制备出(Fe ，Cr)7C3颗粒增强铁基复合材料。用XRD、SEM及EDS对单根铬棒与灰铸铁反应产物的微观结构和成分分布进行研究。结果表明：在1150 ℃保温1.5 h，单根?准2 mm铬棒反应完毕，反应产物主要有初生(Fe ，Cr)7C3和共晶(Fe ，Cr)7C3，且分布均匀；板状和六方状初生(Fe，Cr)7C3的硬度分别为1446、1524 HV0.1；反应区的显微硬度达1278 HV0.1，约是灰铸铁基体的5.3倍。
英文摘要：An iron based composite, reinforced with (Fe, Cr)7C3 particles, was produced by cast-diffusion and heat treatment in-situ synthesis process. The microstructure and composition of (Fe, Cr)7C3 / Fe composite was analyzed by XRD, SEM and EDS. The results show that a single chromium bar with ?准2 mm completely reactes at 1150 ℃ for 1.5 h; the products are mainly primary and eutectic (Fe, Cr)7C3 and uniformly distribute in the matrix; the microhardness of wattle and hexagon is 1446 HV0.1 and 1524 HV0.1, respectively; the microhardness of the reaction region reaches 1278 HV0.1 and is 5.3 times as high as iron matrix.