Slurry erosion of Fe-15 mass%/25 mass% Cr-C-B eutectic alloys

The following slurry erosion experiment is carried out for the purpose of c larifying the behavior of Fe-15 mass% / 25 mass% Cr-C-B eutectic alloys. Th is is done in comparison with the slurry erosion behaviors of both austenit ic and ferritic stainless steels. Three kinds of impact velocity and four k inds of sand content are selected in this experiment. In examining the rela tionship of the slurry erosion rate (R-s) with bath impact velocity (upsilo n) and sand content (V) on a three-dimensional graph, it may be seen that e rosion mainly dominates R-s at the high-impact velocity/high sand content r ate corner of the graph. On the other hand, corrosion highly dominates R-s at the low impact velocity/low sand content corner of the graph. The 75Cr-0 C-2.2B and 25Cr-0.6C-2B alloys show higher slurry erosion resistance compar ed with the others in both corners of the graph. The R, and impact velocity (v) follow the relationship, R-s = Kv(n). The rr-value is approximately 5 in the low-corrosive slurry erosion test using tap water. In the seawater s lurry, however, the low corrosion resistant alloy shows either decreasing o f the n-vatue or losing of the linear relationship between In R-s and ln up silon. (C) 1999 Elsevier Science S.A. All rights reserved.