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Determination of the static, dynamic and cyclic properties of the heat affected zone for different steel grades

  • Jan Schubnell , Dominik Discher and Majid Farajian
Published/Copyright: July 8, 2019
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Abstract

The material properties of the heat affected zone (HAZ) in welds can significantly differ from the material properties of the base material (BM) due to recrystallization effects during heating and cooling. In this work, the microstructure of the heat affected zones of the low- and high strength steels S355J2, S690QL and S960QL was physically simulated by a Gleeble simulator. The temperature profiles for heating and cooling were taken from in-situ temperature measurements of a MAG welding process. The static and dynamic yield strengths of the simulated HAZ were determined by tensile tests under variable strain rates. The cyclic material properties according to Coffin, Manson and Morrow were determined for the HAZ and for the BM of each steel by strain- and stress controlled fatigue tests. Furthermore, the cyclic stress-strain curve of each HAZ was determined according to Ramberg and Osgood. Due to the lack of data for comparison, two approximation methods were used for the determination of the cyclic material properties and were compared to the investigated ones.


Correspondence Address, M. Sc. Jan Schubnell, Gruppe Ermüdungsverhalten, Geschäftsfeld Bauteilsicherheit und Leichtbau, Fraunhofer-Institut für Werkstoffmechanik IWM, Wöhlerstr. 11, 79108 Freiburg, Germany, E-mail:

M. Sc. Jan Schubnell, born in 1987, received his BSc in Mechanical Engineering from Furtwangen University in 2012 and his MSc from Offenburg University of Applied Science, Germany in 2016. Since 2016, he has worked in the group “Fatigue” of the business unit “Component safety and Lightweight Construction” at the Fraunhofer Institute for Mechanics of Materials IWM in Freiburg. Since 2017, he has been a PhD student at the Karlsruhe Institute of Technology, Germany.

M. Sc. Dominik Discher, born in 1990, received his BEng in Mechanical Engineering in 2014 and his MSc from Offenburg University of Applied Science, Germany, in 2017. Since 2014, he has worked at the business unit “Component safety and Lightweight Construction” at the Fraunhofer Institute for Mechanics of Materials IWM in Freiburg, Germany, in the field of crash loadings and material behavior at high strain rates. Since 2018, he has been a PhD student involved in research on dynamic fracture mechanics.

Dr.-Ing. Majid Farajian, born in 1976, received his BSc in Mechanical Engineering from Tehran Polytechnic, Iran, and his MSc in Materials Processing from the Royal Institute of Technology in Stockholm, Sweden. He received his PhD from the Faculty of Mechanical Engineering of the University of Braunschweig, Germany in 2011. After two years of post-doctoral research activities, he continued his work in the field of fatigue and residual stresses at the Fraunhofer Institute for Mechanics of Materials IWM in Freiburg, Germany. He is currently Head of the group “Fatigue” at the Fraunhofer IWM.


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Published Online: 2019-07-08
Published in Print: 2019-07-04

© 2019, Carl Hanser Verlag, München

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