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      Distortion measurements of cylindrical 20MnCr5 discs during quenching in oil∗

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          Abstract

          This paper presents an ultrasonic method to measure the movement of workpiece surfaces during quenching processes in liquids in order to estimate the time-dependent in-process distortion of the workpiece. The movement is determined by the time-of-flight of the ultrasonic signals from the transducer to the surface and back again (impuls-echo-method). As the simulation of quenching processes depends on several assumptions of the model parameters and almost no experimental intermediate geometry data for quenching processes exist, the in-process-measurements of the surface movement can be used to improve the simulation models and also to extend the knowledge about model parameters. The paper shows an analysis of the ultrasonic data for measurements on cylindrical discs of 20MnCr5 steel and compares the ultrasonic in-process results with simulated data. Additionally, coordinate measurements carried out before and after the heat treatment are presented as a reference and the uncertainty of the ultrasonic measurements is discussed.

          Kurzfassung

          In diesem Beitrag wird eine Ultraschall-Methode vorgestellt, mit der sich die Bewegungen von Bauteiloberflächen während des Abschreckprozesses erfassen lassen, woraus der zeitliche Verzugsverlauf eines Bauteils ermittelt werden kann. Die Oberflächenbewegung wird über Laufzeitmessungen von Ultraschall-Signalen zwischen Transducern und der Bauteiloberfläche (Impuls-Echo-Methode) errechnet. Bei der Simulation von Härteprozessen sind verschiedene Annahmen über Modellparameter erforderlich, da kaum In-Prozess-Messdaten für die abgeschreckten Bauteile zur Verfügung stehen. Daher können die In-Prozess-Messungen der Oberflächenbewegung dazu dienen, die Simulationsmodelle zu verbessern sowie die Kenntnisse über die erforderlichen Modellparameter zu erweitern. Der Beitrag stellt eine Analyse der Ultraschall-Messdaten an zylindrischen Scheiben aus dem Stahl 20MnCr5 vor und vergleicht die Ultraschall-In-Prozess-Ergebnisse mit simulierten Werten. Außerdem werden Referenzmessungen mit einem Koordinatenmessgerät vor und nach der Wärmebehandlung dargestellt und die Unsicherheit der Ultraschall-Messungen diskutiert.

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          Most cited references 9

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          Simulation of the distortion of 20MnCr5 parts after asymmetrical carburization

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            Design and Application of Quality Control Strategies at the Operational Level of a Production Process Chain

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              Dickenmessung mit Ultraschall

               K Matthies (1998)
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                Author and article information

                Journal
                htmd
                HTM Härtereitechnische Mitteilungen
                Carl Hanser Verlag
                0341-101X
                2194-1831
                2007
                : 62
                : 4
                : 157-162
                Author notes
                [∗]

                Lecture held by Dirk Stöbener at the 5 th Int. Conf. on Quenching and Control of Distortion and the European Conf. on Heat Treatment, 25–27 April 2007, in Berlin.

                Dipl.-Ing. Dirk Stobener, born in 1970, studied physics at the University of Bremen. Since March 2000 he is employed in the department of Measurement and Control at the faculty of Production Engineering, University of Bremen. He is working on the development of different measurement techniques for the use in heat treatment processes.

                Dipl.-Ing. Carmen Acht, born in 1978, studied Metallurgy and Materials Science and Technical Editorial at the RWTH Aachen. During 2003 and 2007 she has worked at the Stiftung Institut für Werkstofftechnik (IWT) in Bremen.

                Prof. Dr. Ing. Hans-Werner Zoch, born in 1953, studied Mechanical and Process Engineering at the Technical University in Darmstadt and received his PhD at the faculty of Production Engineering at the University in Bremen. From 1980 till 2003 he worked for FAG Kugelfischer Georg Schäfer AG in Schweinfurt and later as Managing Director at Neue Materialien Bayreuth GmbH. Since 2004 he is Professor for Materials Science / Metals at the faculty of Production Engineering at the University in Bremen, Managing Director of the Foundation Institute for Materials Science and Coordinator of the Collaborative Research Center (SFB 570) “Distortion Engineering”.

                Prof. Dr.-Ing. Gert Goch, born in 1949, studied Electronic Engineering at the Technical University Braunschweig and received his PhD at the University of Hamburg. Since 1998 he is Professor at the department of Measurement and Control at the faculty of Production Engineering at the University in Bremen, Director at the Bremen Institute of Industrial Technology and Applied Work Science at the University of Bremen (BIBA) heading the division Metrology, Automation and Quality Science (MAQ) and project manager of the subprojects B3, B6 and B7 in the Collaborative Research Center (SFB 570) “Distortion Engineering”.

                Article
                HT100422
                10.3139/105.100422
                © 2007, Carl Hanser Verlag, München
                Page count
                References: 11, Pages: 6
                Product
                Self URI (journal page): http://www.hanser-elibrary.com/loi/htme
                Categories
                Fachbeiträge/Technical Contributions

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