High chromium-based multi component white cast iron is a promising erosion-resistant material because the crystallization of mainly chromium carbide and the various carbides around reduces the influence of solid particles. In this study, two kinds of high chromium-based multi component white cast irons with 3.0 % each of C, V, Mo and W plus varying Cr of 18% and 27 % were prepared to investigate their erosive wear properties. High chromium cast iron and multi white cast iron were used as the comparison materials. Solid particle erosion tests were conducted using silica sand of 290μm, 1030HV and irregularly shaped steel grits of 770μm, 810HV with impact angles of 30°, 60° and 90° and particle velocity of 100m/s.
The erosive wear tests revealed that the erosion rates of high chromium white cast iron were half of the comparison materials and it showed excellent erosion resistance. In order to clarify the factors that improve erosive wear resistance, EDS and XRD analyses were performed to determine the carbide volume fraction and observe the cross-sections near the wear surface.
The result suggested that since both the carbide ratio and macro matrix hardness are high, it is presumed that high chromium multi white cast iron exhibited excellent wear resistance. In addition, in this cast iron, the matrix is scraped preferentially over the progress and dropout of the protrusions as plastic deformation of the surface progresses.
