High Temperature Tensile and Abrasive Wear Characteristics of As-cast Ductile Irons

In this study, tensile and abrasive wear performances of two different quality as-cast ductile irons have been examined at various temperatures between 25 and 600 °C. Tensile tests were carried out with a strain rate of 3 × 10^-4/s. Wear tests were performed under a compression stress of 5.7 N/mm², by rubbing samples on 125 μm Al ₂O₃ abrasive grains. In the temperature range of 100-300 °C, where serrated flow is observed during tensile testing, tensile strength values of both ductile irons were invariable. Above 400 °C, further increase of temperature caused dramatic decrease in tensile strength. As a general trend, abrasive wear resistances of the both ductile irons increased with increasing tensile strength. Exceptionally, maximum resistance to abrasive wear is obtained from both ductile irons at 100 °C, probably due to dynamic strain aging.