The （Fe

Cr）7C3 particle-reinforced iron matrix composites were fabricated by compounding gray cast iron with chromium wires based on in situ synthesis

in which the （Fe

Cr）7C3 particles were in-situ synthesized through the reaction between Cr from pure chromium wires and C from the gray cast iron. The microstructure of the composites prepared with different reaction time and relative wear-resistance of the composites prepared with different chromium contents were investigated. The results show that the composites are composed of α-Fe

γ-Fe and （Fe

Cr）7C3

in which the （Fe

Cr）7C3 generated is distributed in iron matrix in form of particles and short-rod. With the increase of chromium content

the relative wear resistance of the composites is increased firstly and then decreased. With the chromium content of about 20%

the composites prepared exhibit excellent wear resistance

which is 7 times higher than that of gray cast iron.