Abstract
The ultimate mechanical properties and microstructures of hot-stamped components are highly related with the interfacial heat transfer coefficient (IHTC) between blank and tool. In this paper, an advanced temperature acquisition system was established to measure the temperature of boron steel Usibor 1500P with Al-Si coating during the hot stamping process, and an inverse algorithm was developed to calculate the IHTC. Moreover, the influences of contact pressure and tool roughness on IHTC were discussed. The results show that the IHTC only increases with pressure when it is less than 1MPa, while remains almost unchanged under higher pressure. Meanwhile, little effects on the IHTC are generated by tool surface roughness. Those phenomena are quite different from the commonly studied uncoated blanks. Further exploration demonstrates that the effect of high pressure and tool surface roughness on IHTC is not significant due to the oxidation resistance and the spalling of the Al-Si coating respectively.
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