Hot hardness and oxidation property of target material influence greatly on the erosion behavior at elevated temperature. The correlation between hot hardness, oxidation properties of multi-component white cast irons with 5%Cr-5%Mo-5%W-5%V and their erosion resistance was investigated to estimate the high temperature erosion behavior. Three kinds of multi-component white cast irons containing 0～10%Co were used in this study. High temperature erosion tests were performed using alumina balls with average size of 1.16 mm at impact angle of 30 degree, particle velocity of 30 m/s and test temperature 1173 K.

In order to clarify the correlation of hot hardness, oxidation characteristics and the erosion resistance of specimens, hot hardness test was carried out and erosion damage caused by solid particles was estimated. Hot hardness test of specimens showed a value close to 200 HV10. The results of erosion and oxidation tests revealed that V accelerated oxidation and enhanced the erosion rate, while the erosion rate became smaller with the increase in Co addition. Co formed a stable spinel type oxide film and suppressed the oxidation, thus reduce the erosion rate of multi-component white cast iron.

This Paper was Originally Published in Japanese in J. JFS 88 (2016) 246–251.