Austempering, as a proper heat treatment process for providing desired characteristics through forming bainite Phase in Cast Iron pieces, has always been a matter of concern for researchers and industrialists. In this study, a considerable number of wedge-shaped samples have been manufactured by casting. Then by using heat treatment process the effect of various austempering temperature at a constant austenitising temperature of 900 °C. In order to so, on the structure and also mechanical properties of the samples have been examined. First, the samples were austinited in this temperature and afterwards rapidly conveyed to molten salt bath with different temperatures of 380, 400, and 420 °C. The results obtained from metallography method, processed images of optical microscope and also mechanical tests on existing samples admit that as the austempering temperature increases the percentage of bainite phase in the structure of wedge-shaped samples structures ascends and this obtained structure improves the mechanical properties as well.

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