Effect of ceramic phase on microstructure and mechanical properties of ferrous matrix composite

In order to improve the wear resistance of the material surface, the Fe-Cr-C-B-N-Ti-based iron matrix composite was prepared on the Q235 matrix metal surface by using the bright arc surfacing technology. Metallographic microscope, scanning electron microscope, X ray diffractometer, Rockwell hardness tester and abrasive wear tester were used to analyze and test the microstructure and properties of iron-based composites. The results show that the matrix structure of iron-based composites is composed of martensite (M) and a small amount of retained austenite (A), and the hard phase is composed of TiB₂, TiN, TiC, M₂₃ (C, B)₆, M₃ (C, B) and M₂B. With the increase of titanium addition, the hardness phase particles (TiB ₂, TiN and TiC) and eutectic hard phase (M₂₃ (C, B)₆, M₃ (C, B) and M₂B) increase, and the matrix structure decreases and refine. When the amount of titanium is 4%, the wear resistance of the iron matrix composite is the best, at this time the hardness is 66HRC and the wear amount is 0.042 9 g.