Abstract
The state of the art of the current job is to investigate the effect of cryogenic quenching on mechanical properties of Ti-6Al-4V such as microhardness and microstructure. Cooling rate plays significant role in the re-formation of grains/grains boundaries. Three type of quenching viz. water, cryogenic and air were used in combination with annealing and solution treated samples. It is found that the application of the cryogenic quenching with annealing process achieved minimum microhardness with lowest percentage area of grain boundaries. However, the cryogenic quenching with solution treated sample showed maximum microhardness. This increment in the microhardness is due to the increased bimodal α, β grains and α-β interfaces in the cryogenic quenched solution treated samples. Therefore, the results of the current job showed that the mechanical properties of Ti-6Al-4V can be improved with the help of proper selection of heat treatment and quenching medium.
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