Influence of structural stiffness on the residual stresses during welding of low transformation temperature alloys

  • Low Transformation Temperature (LTT) alloys are high alloyed filler materials, which exhibit a martensitic phase transformation at comparatively low temperatures in order to prevent high tensile residual stresses. A number of publications have already shown that even compressive residual stresses can be observed when using LTT filler materials. Up to know it is not clear in which way this it applicable to multi-run welding exhibiting high shrinkage restraint and complex heat input. In this study the potential for stress reduction during welding of LTT alloys was studied by numerical simulation. This allows for evaluation of the stress development in every single weid run. Additionally, the impact of the structural stiffness was incorporated by modelling a special sample geometry exhibiting a high intensity of restraint. The results show that the stress formation in weid longitudinal direction is determined by the phase transformation as high compressive residual stresses were foundLow Transformation Temperature (LTT) alloys are high alloyed filler materials, which exhibit a martensitic phase transformation at comparatively low temperatures in order to prevent high tensile residual stresses. A number of publications have already shown that even compressive residual stresses can be observed when using LTT filler materials. Up to know it is not clear in which way this it applicable to multi-run welding exhibiting high shrinkage restraint and complex heat input. In this study the potential for stress reduction during welding of LTT alloys was studied by numerical simulation. This allows for evaluation of the stress development in every single weid run. Additionally, the impact of the structural stiffness was incorporated by modelling a special sample geometry exhibiting a high intensity of restraint. The results show that the stress formation in weid longitudinal direction is determined by the phase transformation as high compressive residual stresses were found here independent from the weid run. On the other hand the transformation induced stresses in weid transverse direction are superimposed by tensile stresses originated from shrinkage restraint. With increasing number of runs the tensile residual stress level is raised. The results were confirmed by residual stress measurements using diffraction methods.zeige mehrzeige weniger

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Metadaten
Autor*innen:J. Gibmeier, Jens Weidemann, Jonny Dixneit, Thomas KannengießerORCiD, Arne KrommORCiD
Dokumenttyp:Beitrag zu einem Tagungsband
Veröffentlichungsform:Graue Literatur
Sprache:Englisch
Titel des übergeordneten Werkes (Englisch):Mathematical Modelling of Weld Phenomena 11
Jahr der Erstveröffentlichung:2016
Verlag:Verlag der Technischen Universität Graz
Verlagsort:Graz
Erste Seite:259
Letzte Seite:276
Freie Schlagwörter:Influence; Low transformation; Residual stresses; Structural stiffness; Temperature alloys; Welding
Veranstaltung:11th International Seminar - Numerical Analysis of Weldability
Veranstaltungsort:Graz, Austria
Beginndatum der Veranstaltung:27.09.2015
Enddatum der Veranstaltung:30.09.2015
ISSN:2410-0544
ISBN:978-3-85125-490-7
Verfügbarkeit des Dokuments:Datei im Netzwerk der BAM verfügbar ("Closed Access")
Datum der Freischaltung:19.01.2017
Referierte Publikation:Nein
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