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Investigations on the thermal conditions during laser beam welding of high-strength steel 100Cr6

  • This study examines the thermal conditions during laser beam welding of 100Cr6 high-strength steel using a TruDisk5000 disc laser with a continuous adjustable power range of 100–5000 W. Two parameter sets, characterized by laser power and welding speeds, were analyzed by thermal-metallurgical FE simulations to determine their impact on the thermal conditions during welding. The results show a significant shift in heat coupling, with conduction transitioning to deep penetration welding. As a result of the high welding speeds and reduced energy input, extremely high heating rates up to 2∙104 K s−1 (set A) respectively 4∙105 K s−1 (set B) occur. Both welds thus concern a range of temperature state values for which conventional Time-Temperature-Austenitization (TTA) diagrams are currently not defined, requiring calibration of the material models through general assumptions. Also, the change in energy input and welding speed causes significantly steep temperature gradients with a slope of approximately 5∙103 K mm−1 and strong drops in theThis study examines the thermal conditions during laser beam welding of 100Cr6 high-strength steel using a TruDisk5000 disc laser with a continuous adjustable power range of 100–5000 W. Two parameter sets, characterized by laser power and welding speeds, were analyzed by thermal-metallurgical FE simulations to determine their impact on the thermal conditions during welding. The results show a significant shift in heat coupling, with conduction transitioning to deep penetration welding. As a result of the high welding speeds and reduced energy input, extremely high heating rates up to 2∙104 K s−1 (set A) respectively 4∙105 K s−1 (set B) occur. Both welds thus concern a range of temperature state values for which conventional Time-Temperature-Austenitization (TTA) diagrams are currently not defined, requiring calibration of the material models through general assumptions. Also, the change in energy input and welding speed causes significantly steep temperature gradients with a slope of approximately 5∙103 K mm−1 and strong drops in the temperature rates, particularly in the heat affected zone. The temperature cycles also show very different cooling rates for the respective parameter sets, although in both cases they are well below a cooling time t8/5 of 1 s, so that the phase transformation always leads to the formation of martensite. Since the investigated parameters are known to cause a loss of technological strength and conditionally result in cold cracks, these results will be used for further detailed experimental and numerical investigation of microstructure, hydrogen distribution, and stress-strain development at different restraint conditions.show moreshow less

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Author: Eric WasilewskiORCiD, Nikolay DoynovORCiD, Ralf OssenbrinkORCiD, Vesselin MichailovORCiDGND
URL:https://www.sciencedirect.com/science/article/pii/S2666912923000077
DOI:https://doi.org/10.1016/j.aime.2023.100118
ISSN:2666-9129
Title of the source (English):Advances in Industrial and Manufacturing Engineering
Document Type:Scientific journal article peer-reviewed
Language:English
Year of publication:2023
Tag:high-strength steel; laser beam welding; temperature rates; thermal-metallurgical FE simulation; welding temperature field
Volume/Year:6
Article number:100118
Fundername (not EU):Robert Bosch GmbH, Föhrenbach Positioniersysteme GmbH, Anton Häring KG, Volkswagen AG, Bundesanstalt für Materialforschung und -prüfung (BAM)
Project number (not EU):13N13832
Way of publication:Open Access
Faculty/Chair:Fakultät 3 Maschinenbau, Elektro- und Energiesysteme / FG Füge- und Schweißtechnik
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