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.