Abstract
Hot press forming (HPF) is a process to produce ultra-high strength steel of boron sheet metals for lighweight and high strength capabilities. Currently, water is used as coolant in the HPF process to quench boron steels in a closed die with a cooling channel. However, to enhance the performance of HPF dies and increase the mechanical properties of hot pressed boron steel, the fluid with better thermal properties is used instead of normal water. This study recommends the use of alumina naonocoolant Al2O3 in cooling channel of hot-press forming dies Chilled water for HPF experiment, on the other hand, showed the pearlite microstructure transformation due to the lower convection heat transfer value and cooling rate. The strength of boron steel from nanocoolants was evaluated to increase up to 190.90% after the quenching operation, while the hardness was approximately enhanced 414.28% from the as delivered condition. As compared with chilled water, the tensile strength was approximately improved 47.5%, but the Vickers hardness value was reminded satisfactory limit rate as hot formed part. In conclusion, nanocoolant as cooling fluid produces higher convection heat transfer coefficient compared to the chilled water to improve microstructure and mechanical properties of sheet metal steels.
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