Effect of different preform structures on interfacial microstructure and wear properties of WC/Fe composites material

Abstract

The WC preform was prepared by vacuum sintering, and a WC/Fe composite was obtained by an infiltration casting process with different preform structures. The microstructure of the composite was characterized by scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), and x-ray diffraction (XRD), and the wear properties of the three-body abrasives were further studied. The temperature field and solid-liquid variable field of the WC/Fe composite were simulated using finite element software. The results show that the microstructure of the WC/Fe composite contains WC, Ni _3 Fe, Ni _17 W _3 , Fe _3 W _3 C, and M _7 C _3 carbides. With an increase in the preform column spacing from 10 mm to 20 mm, the width of the transition layer of the WC/Fe composite increased, and the hardness increased from 749 HV to 853 HV. The mass loss of the WC/Fe composite decreased initially and then increased with an increase in the preform column spacing. The microstructure and wear resistance of materials are related to the W content in the transition layer, and the diffusion behavior of W is affected by the diffusion distance and time.

Keywords

• WC
• Fe composites material
• preform
• interface
• wear resistance
• finite element