Using the high-chromium steel as substrate prepares WC particles reinforced steel matrix surface 1ayer composites were by V-EPC infiltration. In this study

we control the impact of infiltration

especially the interface in infiltration layer by using different granularity of high carbon-Cr iron powder

and discuss that the effects of alloy powder granularity in perform later on the quality of surface and microstructure. The result shows that with reducing the grain size of alloy powder

the infiltration layer becomes thicker and the quality of surface becomes better. When the grain size of high carbon-Cr iron powder is 200 to 320 meshes

the prepared WC/steel surface composites has intact and flawless infiltration layer

the thickness is 3 mm. The study of microstructure showed that the smaller grain size of high carbon-Cr iron is

the gentler transition zone and more adequate the dissolvability of WC-particle is.