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 nanocoolant Al2O3 in cooling channel of hot-press forming dies. Chilled water for HPF experiments, 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 by 47.5%, but the Vickers hardness value limit rate remained as satisfactory as the hot formed part. In conclusion, nanocoolant as a cooling fluid produces higher convection heat transfer coefficient compared to the chilled water to improve microstructure and mechanical properties of sheet metal steels.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callMore From: Reference Module in Materials Science and Materials Engineering
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
