Study on the impact wear mechanism and damage modes of compacted graphite cast iron

Abstract

The impact wear mechanism of compacted graphite cast iron (CGI) at different temperatures (room temperature, 300 °C, 400 °C, and 500 °C) and impact frequencies (10 Hz, 12 Hz, and 14 Hz) was analyzed. The mass losses increase with test temperatures, impact frequencies and numbers. When the temperature increases to 500 °C, shallow, deep-spalling, and oxidation are the main wear mechanism of CGI. Metal oxides are generated and shed repeatedly, which can accelerate the impact wear of CGI. In addition, there are mainly two cracking modes during the impact wear test (I) Micro-cracks can generate preferentially in the graphite cavities, caused by surficial graphite falling off affected by the high-frequency shocks. The graphite cavities and micro-cracks can coalesce with each other to form the main crack (Ⅱ) The hard metal particles due to fatigue spalling can inset in the soft matrix and cause cracking.

Keywords

• Compacted graphite cast iron
• Impact wear
• Graphite cavities
• Shallow
• Deep-spalling