High chromium cast iron core welding wire was selected to carry out surfacing experiments with different layer temperatures on the ZTA reinforced high chromium cast iron base composite test block. The microstructure and interface of deposited metal and composites were observed by bulk microscope

optical microscope and scanning electron microscope

and the volume percentage of deposited metal carbide was counted by quantitative gold phase method. The results show that

the deposited metals are typical high chromium cast iron with different layer temperature. The microstructure consists of primary carbide

eutectic ledeburite

martensite and retained austenite. With the decrease of interlayer temperature

the volume percentage of carbide increases gradually

and the volume percentage of deposited metal carbide can reach 55.17% when the layer temperature is 30 ℃. The lower the interlayer temperature is

the more fully the stress is released through the stress release crack. When the layer temperature is 30 ℃

the ZTA particles are not cracked and the interface is stripped

which is suitable for surfacing welding of composite materials.