Abstract In this paper, (Fe,Cr)7C3/Fe surface gradient composite was produced by solid reaction combining in situ reaction, using pure chromium plate and HT300. The chromium carbide particles were synthesized in the HT300 by in situ reaction between the chromium atoms of the chromium plate and the carbon atoms of the HT300. The phase constituent, microstructure, microhardness and modulus of the composite were characterized by X-ray diffraction, scanning electron microscopy and nano-indentation instrument. The anisotropy of (Fe,Cr)7C3 is emphatically studied. The results show that the (Fe,Cr)7C3, which is directed toward the direction of the matrix has certain preferred orientation characteristics during the in-situ reaction, and the (Fe,Cr)7C3 in preferred growth direction has a higher microhardness and elastic modulus than that of the non preferred growth direction.

中文翻译：

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固相反应法制备(Fe,Cr)7C3/Fe表面梯度复合材料的微观结构及各向异性研究

摘要 本文采用纯铬板和HT300，通过固相反应结合原位反应制备(Fe,Cr)7C3/Fe表面梯度复合材料。通过铬板的铬原子与HT300的碳原子之间的原位反应，在HT300中合成碳化铬颗粒。通过X射线衍射、扫描电镜和纳米压痕仪对复合材料的相组成、显微组织、显微硬度和模量进行了表征。重点研究了(Fe,Cr)7C3 的各向异性。结果表明，(Fe,Cr)7C3 指向基体方向，在原位反应过程中具有一定的择优取向特征，(Fe,