The Effect of Two-Step Austempering on Abrasion Wear Characteristics of the Ductile Cast Iron

摘要

This paper focuses on the effect of two-step austempering on abrasion wear characteristics of the ductile cast iron. The single-step (conventional) and two-step austempering were employed for the samples. There were four treatments. For all samples, austenitization at 900°C was done. The first treatment comprised of conventional austempering at 400°C. The second one consisted of conventional austempering at 320°C. The third one consisted of austempering at 400°C followed by austempering at 320°C. The fourth one comprised of austempering at 320°C followed by austempering at 400°C. The results showed that samples with two-step austempered at 320°C followed by 400°C exhibited enhanced abrasion resistance. The reason for this behavior is discussed considering the microstructure parameters.