Abstract
An investigation into the mechanical and tribological behaviour of copper alloyed austempered gray cast iron (AGI) has been carried out at different austempering temperatures. Tensile and wear tests specimens are prepared from cu-alloys as-cast gray iron, and subjected to austempering heat treatment at six different austempering temperature for 1hr respectively. The resulting microstructures are evaluated through optical microscopy, scanning electron microscope (SEM) and X-ray diffraction analysis. In study, the hardness, tensile properties and wear with coefficient of friction (COF) behaviour of all these austempered specimens are determined and examine the relationship of microstructural changes with austempering temperature. However, wear test is carried out using a block-on-roller multi-tribotester with sliding speed of 1.86 m/sec. After wear test, examination of worn surfaces under scanning electron microscope (SEM) shows that delamination and adhesion are the dominant wear mechanisms in the AGI samples. Whereas wear with coefficient of friction (COF) behaviour also found to be dependent on the hardness and tensile properties.
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