Blast Erosion Properties of Overlay Weld Metal

Abstract

The final purpose of our study is to discuss the selection of surface modification processes and/or materials from a viewpoint of blast erosion properties. In this study, an experimental investigation was carried out on the blast erosion resistance of overlay weld metals. Seven different weld metals of Ni-Cr steel, Co-base alloy and Ni-base alloy etc., whihc were produced by GMAW, SMAW and PTA, were examined in comparison with SUS304 steel and SCS5 cast steel. Experimental results showed that the better correlation between volume erosion rate and Vickers hardness after erosion could be obtained except the weld metals by PTA. The higher the Vickers hardness after erosion, the lower was the volume erosion rate. However, in the case of the weld metals by PTA, the volume erosion rates were higher than the rate of other materials for the large hard phase precipitated. The volume erosion rate of NbC dispersed weld metal showed good agreement with that of SUS304 matrix.