Abstract: To bring the excellent abrasion-resistant po- tential of carbide into full play,composites of cast tungsten carbide(CTC)grains based on mainly plate martensite and high Cr,W white cast iron are made on substrate of grey iron by cast-in-place hardfacing process.Results of high-stress two-body and three-body abrasion show that:(1) Base alloy microstructures have overwhelming dominating effects on abrasion resistances of the composites in two-body and especially three-body abrasion systems.(2)All composites have very ex- cellent abrasion-resistances which increase drasti- cally with the increase of CTC grain size.In case of the same CTC grain size,composite based on martensite white cast iron is much more wear-resistant than that based on mainly plate martensite although the volume fraction of CTC grains in the latter is considerably larger than that in the former.In three-body abrasion system,load has little effect on wear rate for composites based on martensite white cast iron,but wear rate of conventional wear-resistant materials increases linearly in a very steep slope as the nominal stress increases.

Key words: abrasion, cast tungsten carbide(CTC), composite