Investigation of interfacial heat transfer characterization for TC4 alloy in triple-layer sheet hot stamping process

During the hot stamping process, heat exchange always occurs between sheet and cold tools. The interfacial transfer in whole-forming process will not only affects forming quality of parts but also partially determines their post-form mechanical properties microstructure distribution. As an essential parameter, interface coefficient (IHTC) is great significance for prediction temperature fields finite element simulations, especially novel-forming named triple-layer stamping. In this study, experiment carried out to investigate behavior titanium alloy process. effects contact pressure, cladding steel thickness, gap on are analyzed, high-strength sheets calculated. model established verify accuracy calculated coefficient. results show that upper lower maintain at a higher level compared with single-layer one. under decreases from 900 781.6 °C after transferring, decrease 118.4 °C. declines by 57.5 during period addition, obtained have better properties. IHTC increases increase pressure thickness gap. validated comparing simulation. maximum error simulation experimental measurements 5.5%.