Preparation and Properties of In-situ Synthesized TiC Particle ReinforcedHigh Manganese Steel Composite Layer on Mixing Blade Surface

By combination of combustion synthesis reaction casting infliltration and vacuum-expendable pattern casting, in-situ systhesized TiC particle reinforced high manganese steel composite layer was prepared on the surface of ZG120Mn13Cr2 high manganese steel mixing blade. The microstructure, hardness and wear resistance under wet sand wear conditions of the composite layer were studied. The hardness and wear resistance were compared with those of BTMCr20 high chromium cast iron and ZG120Mn13Cr2 high manganese steel. The field service life of the blade with composite layers under stabilized soil conditions was tested. The results show that the composite layer was metallurgically bonded to the high manganese steel matrix. The microstructure of the composite layer consisted of in-situ systhesized fine TiC particles, extra coarse TiC particles and high manganese steel matrix phases, and the in-situ synthesized TiC particles were spherical or nearly spherical and uniformly distributed in the matrix phase. The average hardness of the composite layer was 58 HRC, which was higher than that of high manganese steel and lower than that of high chromium cast iron. The wear mass loss of the composite layer was slightly higher than that of high chromium cast iron but much lower than that of high manganese steel. The field service life of the blade with the composite layer was 1 700 h, which was more than 2 times that of the high manganese steel blade, slightly higher than that of the high chromium cast iron blade.