Investigation of deformation and element diffusion in joint interface of mild carbon steel and HCrWCI welded by friction welding

Abstract

In this study, continuous drive friction welding process is selected for joint dissimilar high chromium white cast iron and mild carbon steeel. The microstructure, presence and diffusion of elements, deformation in interface of weld metal were analyzed by scanning electron microscopy (SEM), optical microscopy (OM), energy dispersive spectroscopy (EDS), elemental mapping and X-Ray diffraction (XRD). Elemental analysis was applied to the fractured surface after the tensile test. The rotational speed from the friction welding process parameters had a significant impact on the quality of the welded joint. Due to element diffusion at the weld interface, carbides consisting of Cr7C3 and Cr23C6 were occurred. Carbon, which is the dominant element of the diffusion process, was decisive in the emergence of the carbide layer.