抄録
Cavitation erosion tests for rimmed and killed steels were performed using a magnetostrictive vibratory facility. In ion exchanged water, the ratios of erosion resistance of Al-killed and Si-killed steels to that of rimmed steel for the annealed specimens were 1.16 and 1.33, respectively. Thus, erosion resistance is improved by deoxidized treatment for the both annealed and quenched specimens, even though the carbon content and crystal structure of steel are the same. In 3% salt water, the weight loss rates of Al-killed and Si-killed steels increased about 10%, but that of rimmed steel did not increase compared with those in ion exchanged water. These behaviors were discussed through the measurements of erosion particle size and/or number and length of cracks observed on the cross section of specimen. Furthermore, erosion resistance was found to show a better correlation with σB2/E of HV2/E.
