Investigation on mechanical properties and wear behavior of Cu-alloyed austempered gray cast iron (AGI)

摘要

The aim of this investigation is to assess the influence of austempering heat treatment on microstructure, mechanical properties, and wear behavior of copper alloyed AGI. Tensile and wear test samples are prepared from as-cast gray iron. Initially, samples are austenitized and then isothermally austempered at sixdifferent temperatures for the constant time period. The resulting microstructures are evaluated and characterized by means of a light microscope, scanning electron microscope (SEM) and X-ray diffraction analysis. The wear test is carried out using a ‘‘block-on-roller’’ type multi-tribotester machine. The mechanical properties and wear behavior of the AGI samples are also determined and discussed systematically. Results showed that the mechanical and wear properties of AGI are significantly enhanced in comparison with as-cast gray iron. Thewear behavior of AGI samples may be correlated with microstructure and mechanical properties. The hardness, tensile strength, elongation and volume fraction of austenite act as independently in influencing the wearbehavior.