Impact angle of maximum erosion rate of wear resistant spheroidal graphite cast iron eroded by SiO₂ and AI₂O₃ particles

Abstract

The influence of matrix structure, erodent and impact angle on the wear resistance of pearlitic and bainitic spheroidal graphite cast irons was studied using impact tests with SiO₂ and AI₂O₃ particles. Erosion with AI₂O₃ particles produced significantly larger materials removal rates for both irons. The bainitic ADI was more wear resistant than the pearlitic PDI specimens at impact angles > 30°. The type of erodent did not affect the impact angle of maximum erosion rate for ADI, but for the PDI specimens this angle was higher with AI₂O₃ particles than with SiO₂. Examination of the wear surface by SEM provided evidence of many brittle cracks on PDI specimens following impact with A1₂O₃; this correlates with the higher impact angle of maximum wear for this material-erodent combination. The higher fracture toughness of the AI₂O₃ particles also played a role in the erosion wear behaviour observed for both PDI and ADI. IJCMR/435

Keywords:

• Erosive wear
• Austempered ductile iron
• Spheroidal graphite cast iron
• Wear resistance