In hot forming die quenching, furnaces are used to austenitize steel blanks and transform an Al-Si layer into a permanent Al-Si-Fe coating. Application of a simplified heat transfer model to thermocouple measurements on steel blanks heated in industrial furnaces showed specific heats that varied with blank thicknesses, raising questions about the accuracy of these measurements. A detailed experimental study on a lab scale muffle furnace shows that natural convection and variations in the surrounding temperatures has a strong influence on the inferred specific heat. An improved heat transfer model is used to qualitatively assess how austenitization influences the effective specific heat.
Accuracy of Thermocouples in Transient Surface Temperature Measurements Dominated by Radiant Heating
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Jhajj, KS, Caron, EFJR, Chester, NL, & Daun, KJ. "Accuracy of Thermocouples in Transient Surface Temperature Measurements Dominated by Radiant Heating." Proceedings of the ASME 2014 International Mechanical Engineering Congress and Exposition. Volume 8B: Heat Transfer and Thermal Engineering. Montreal, Quebec, Canada. November 14–20, 2014. V08BT10A036. ASME. https://doi.org/10.1115/IMECE2014-38243
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