Erosion Rate Model and Influencing Factors of Cr26 High Chromium Cast Iron for Solid-Liquid Two-Phase Flow Pump Impellers

Erosion tests were conducted on Cr26 high chromium cast iron by orthogonal testing method. The erosion rate calculation model of Cr26 high chromium cast iron was obtained by multiple nonlinear regression of testing results on basis of erosion rate theory calculation model, and the accuracy of the model was verified. The rule of erosion rate vs influencing factors was described quantitatively by tests and model calculation. The results show that the erosion rate calculation formula of Cr26 high chromium cast iron had high accuracy. With the increase of erosion angel, the erosion rate increased first, then decreased and finally increased slightly, and reached the maximum value near the erosion angle of 40°. The main wear form was cutting wear at low erosion angle and deformation wear at the high erosion angle. With the increase of solid particle size, the erosion rate increased, the proportion of cutting wear increased, and the proportion of deformation wear decreased. With the erosion velocity increasing, the proportion of cutting wear decreased, and the proportion of deformation wear increased.