Abstract
Medium carbon micro-alloyed steels are mostly being utilized in the application where quenched and tempered steels are needed for cost-productive processing. However, the impact toughness of micro-alloyed steels is inferior to that of quenching & tempered steels, which resist their use in critical applications. Conventional techniques are used for hardness enhancement of micro-alloyed steels due to reduction in carbon percentage, the addition of relevant chemical constituent such as titanium to achieve the reduction in the amount of pearlite and controlling the microstructure during thermomechanical processing, subsequently after cooling and forging. In this research work, the effect of hot deformation and control cooling temperature on the microstructure of medium carbon micro-alloyed steel 38MnSiVS5 was studied. Different approaches were performed to improve the impact toughness and hardness and found out that forced air cooling of the micro-alloyed steel 38MnSiVS5 forgings resulted in the finest microstructure and exhibiting a higher hardness of 45.93 RC.
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