Interface reaction study of SiC reinforced Mn13 composite synthesised by metal infiltration

Abstract

SiC reinforced Mn13 matrix composite was synthesised by vacuum evaporation pattern casting infiltration process. The interface reaction between SiC particles and matrix was investigated. Hardness test, optical metallography observation and X-ray diffraction analysis indicated SiC decomposition. Some decomposition products C and Si were solid solute in steel matrix to increase matrix hardness, while others reacted with Fe and formed primary carbides and Fe₃Si respectively. Some C atoms coming from SiC decomposition precipitated in the form of graphite. The reaction zone might act as a diffusion barrier preventing further SiC decomposition. The added alloy elements Cr and Mn obstructed Fe in rapidly diffusing to SiC particulate and retarded SiC decomposition rate. The strong attraction between C and Cr avoided the presence of abundant graphite in composite microstructure.

Keywords:

• High manganese steel
• SiC particulate
• Vacuum evaporation pattern casting
• Decomposition

This study was jointly supported by Shanxi Province Office of Education (08JK345) and Shanxi Province Programs for Industry Development (2008K06-18). The authors would like to acknowledge their supports.