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An investigation of the Temperature Distribution of a Thin Steel Strip during the Quenching Step of a Hardening Process

1
Division of Processes, Department of Material Science and Engineering, KTH Royal Institute of Technology, SE-100 44 Stockholm, Sweden
2
Department of Material Science and Engineering, Dalarna University, SE-791 88 Falun, Sweden
3
Research & Development Department, voestalpine Precision Strip AB, SE-684 28 Munkfors, Sweden
*
Author to whom correspondence should be addressed.
Metals 2019, 9(6), 675; https://doi.org/10.3390/met9060675
Received: 10 May 2019 / Revised: 3 June 2019 / Accepted: 8 June 2019 / Published: 11 June 2019
(This article belongs to the Special Issue Forming and Heat Treatment of Modern Metallic Materials)
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Abstract

The dimension quality of the strip within the hardening process is an essential parameter, which great attention needs to be paid. The flatness of the final product is influenced by the temperature distribution of the strip, specifically across the width direction. Therefore, based on physical theories, a numerical model was established. The temperature of the strip for the section before the martensitic transformation was objected in the predicted model by using a steady state approach. In addition an infrared thermal imaging camera was applied in the real process in order to validate the results and to improve the boundary conditions of the numerical model. The results revealed that the temperature of strip decreased up to 250 °C within the area between the furnace and the quenching bath. This, in turn, resulted in significant temperature difference across the width of the strip. This difference can be up to 69 °C and 41 °C according to the numerical results and thermal imaging data, respectively. Overall, this study gave a better insight into the cooling step in the hardening process. In addition, this investigation can be used to improve the hardening process as well as an input for future thermal stress investigations. View Full-Text
Keywords: continuous hardening process; martempering; heat transfer; numerical modelling; CFD continuous hardening process; martempering; heat transfer; numerical modelling; CFD
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Pirouznia, P.; Andersson, N.Å.I.; Tilliander, A.; Jönsson, P.G. An investigation of the Temperature Distribution of a Thin Steel Strip during the Quenching Step of a Hardening Process. Metals 2019, 9, 675.

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