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      Getting to Know your Own Induction Furnace: Basic Principles to Guarantee Meaningful Simulations∗ Translated title: Den eigenen Induktionsofen kennenlernen: Grundlagen zur Gewährleistung aussagekräftiger Simulationen

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          This paper deals with a methodology for a characterisation of inductive heat treatment plants to allow comparison of their practical electromagnetic behaviour with conventional simplifying assumptions used in simulations of the heating process. The impact non-sinusoidal currents and non-linear B-H curves on the simulation are specifically dealt with here. A Rogowski coil and digital oscilloscope are used to read in current signals in various induction plants and compare their total harmonic distortion (THD). In the course of parameter studies, the different current signals were used in simulations of induction to compare heating effects. This yielded positive correlations with the THDs.


          Diese Arbeit präsentiert eine Methodik zur Charakterisierung von induktiven Wärmebehandlungsanlagen, um deren reales elektromagnetisches Verhalten mit den standardmäßig getroffenen, vereinfachenden Annahmen von Simulationen des Erwärmprozesses vergleichen zu können. Spezifisch wird darauf eingegangen, wie sehr eine nichtlineare BH-Kurve und ein nicht sinusförmiges Stromsignal Einfluss auf das Simulationsergebnis nehmen. Mit einer Rogowski-Spule und einem digitalen Oszilloskop werden Stromsignale von verschiedenen Induktionsanlagen eingelesen und mithilfe des Total-Harmonic-Distortion (THD)-Wertes verglichen. Im Rahmen einer Parameterstudie werden die verschiedenen Stromsignale in eine Induktionssimulation gespeist und ihre Heizleistungen zueinander in Verhältnis gestellt, wobei sich eine positive Korrelation zum THD zeigt.

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          Most cited references 7

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          On the definition of total harmonic distortion and its effect on measurement interpretation

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            Modeling a working coil coupled with magnetic flux concentrators for barrel induction heating in an injection molding machine

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              Effects of the Inductive Hardening Process on the Martensitic Structure of a 50CrMo4 Steel*

               A. Vieweg (corresponding) ,  G. Ressel,  P. Prevedel (2017)
              This study focuses on the influence of a fast heat treatment, as occurring with induction heating processes, on the microstructural features, and their effect on the mechanical properties of a 50CrMo4 steel. To this end, three different heating rates (1 K/s, 10 K/s, and 100 K/s) and three different austenitizing temperatures (950 °C, 1000 °C, 1050 °C) were applied to a ferritic-pearlitic steel. After quenching, the resulting martensitic microstructures were investigated and compared to a conventional furnace heat treating sequence using electron back scattered diffraction (EBSD). Thus, the effect of variable heating rates during austenitization on the resulting martensitic microstructure, including the evaluation of packet and block sizes and orientations, was analyzed. Through the investigations of this work, it could be shown, that the adaption of the Kurdjumov-Sachs (K-S) variants is changing with the prior heat treatment. The occurrence of all 24 K-S variants in the same intensity increases and the misorientation angle across a martensite block decrease with higher austenitizing temperatures, despite fast heating rates. Therefore, it is suggested, that the austenitizing temperature has more impact on the martensitic structure than the heating rate.

                Author and article information

                HTM Journal of Heat Treatment and Materials
                Carl Hanser Verlag
                14 August 2019
                : 74
                : 4
                : 267-276
                1 Materials Center Leoben, Forschung GmbH, Roseggerstraße 12, 8700 Leoben, Österreich
                2 Institut für Mechanik der Montanuniversität Leoben, Franz Josef-Straße 18, 8700 Leoben, Österreich
                Author notes

                Lecture held at the ASMET Werkstofftechnik- und Härtereitagung 2019, March 28–29, 2019 in Vienna, Austria

                3 daniel.mevec@ (corresponding author/Kontakt)
                © 2019, Carl Hanser Verlag, München
                Page count
                References: 14, Pages: 10
                Self URI (journal page):
                Scientific Contributions/Fachbeiträge


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