38916 2016 eng 1 8 7 21 article NDT.net Kirchwald 0 -- -- -- The detection and characterization of surface cracks in steel specimens prior to damage is a technologically and economically highly significant task and is of utmost importance when it comes to safety-relevant structures. In steel production where steel billets at high temperatures have to be inspected while moving a number of well-established NDT methods cannot be applied. Laser thermography however is a promising candidate to serve as a fast, non-contact and remote tool in this case. We present a study that shows that the crack detection capabilities of laser thermography can be extended also to specimens at high temperature. A combination of inductive and laser heating allows to systematically study the contrast formation as well as the optimization of the important measurement parameters. The experiments are accompanied by FEM simulations that provide a better insight of the physical correlations and support the experimental developments. The aim of these studies is to develop a system with high inspection speed and detection performance to be in-line operated under the hostile environment of steel production lines. The e-journal of nondestructive testing & ultrasonics http://ndt.net/?id=19573 1435-4934 urn:nbn:de:kobv:b43-389161 19th World Conference on Non-Destructive Testing (WCNDT 2016) Munich, Germany 13.06.2016 17.06.2016 Creative Commons - Namensnennung 3.0 Sreedhar Unnikrishnakurup Philipp Myrach Benjamin Polomski Elisabeth Le Claire N. Vengara Krishnan Balasubramaniam Mathias Ziegler eng uncontrolled In-line Monitoring eng uncontrolled Laser Infrared thermography eng uncontrolled Cracks eng uncontrolled Induction heating eng uncontrolled Steel billets eng uncontrolled FEM simulation Ingenieurwissenschaften und zugeordnete Tätigkeiten Datei für die Öffentlichkeit verfügbar ("Open Access") Graue Literatur Wissenschaftliche Artikel der BAM Bundesanstalt für Materialforschung und -prüfung (BAM) https://opus4.kobv.de/opus4-bam/files/38916/2016-WCNDT-Thermographic Crack Detection in hot steels.pdf