The Microstructure of Ni-based Surface Infiltrated Layer on Cast Steel Substrate

摘要

The Ni-based alloying powder was successfully used as the raw materials for fabricating surface infiltrated layers on cast steel ZG45 substrate through a vacuum infiltration casting technique (VICT). The microstructures of surface Ni-based infiltrated layer, the micro-hardness distribution are investigated. The infiltrated layer includes three areas that are surface part-melting area, melting completely fusion area and diffusion solid solution area. The main composition of surface infiltrated layer was intermetallic compound Cr_2B, NiB and solid solution. The main phase of transition layer was solid solution. The micro-hardness of Ni-based infiltrated layer presented gradient change from surface infiltrated layer to substrate. The average micro-hardness was about 550HV.