Abstract
ABSTRACT Different cast steels (low-, medium- and high-carbon cast steel) converted into the wrought form by hot rolling and forging processes, the temperature of hot rolling and forging processes are kept 1000°C and then these cast and wrought steel samples prepared and subjected to high temperature oxidation in air under cyclic heating condition for 50 cycles, every cycle consisting of 1-h heating and 20-min cooling. Oxidation kinetics was established by thermo-gravimetric methods by measuring the weight changes at the end of each cycle. The oxidised samples with oxide-scaled surface were investigated for X-ray analysis, scanning electron microscopy (SEM) and Energy Dispersive X-Ray Analysis (EDAX) . All the steel samples suffered oxidation attack in the air which resulted in intense spalling of the oxide scale. It is also observed that the high temperature oxidation rate is maximum for casted samples and is minimum for the rolled samples and for forged samples it lies between cast and rolled steel.
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