Experimental and numerical investigation of dynamic transformation induced plasticity during hot forming

verfasst von: Bernd-Arno Behrens, Johanna Uhe, Hendrik Wester, Christoph Kock, Norman Heimes
Abstract: Hot forging processes are influenced by numerous thermo-mechanical-metallurgical material phenomena, which interact strongly. In particular, the strains due to transformation-induced plasticity (TRIP) occurring during the forming process have a considerable influence on the distortion and residual stresses of the components. As TRIP strains are anisotropic they depend on the orientation and magnitude of the stress states superimposed to the phase transformation during cooling. By numerical modelling the impact of the TRIP effect can be analysed and taken into account during process design. However, required material data are poorly accessible to non-existent in literature. Therefore, this work focuses on the determination of characteristic values of TRIP for the material AISI 52100 considering dynamic effects. Tests were performed using hollow specimens which were thermo-mechanically loaded. An external stress was applied shortly before the start of the transformation and, in the case of reversible transformation plasticity, selectively released during the transformation phase. In this way, it was possible to determine phase-specific as well as load-dependent reversible transformation plasticity effects. The determined values for TRIP effect with and without backstress were transferred to a FE simulation and successfully validated with an experimental comparison. The material models and subroutines created are now to be validated on the basis of experimental forging tests by comparing distortion and residual stresses.
Organisationseinheit(en): Institut für Umformtechnik und Umformmaschinen
Typ: Aufsatz in Konferenzband
Seiten: 164-169
Anzahl der Seiten: 6
Publikationsdatum: 13.06.2023
Publikationsstatus: Veröffentlicht
Peer-reviewed: Ja
ASJC Scopus Sachgebiete: Werkstoffmechanik, Metalle und Legierungen, Oberflächen, Beschichtungen und Folien
Elektronische Version(en): https://doi.org/10.37904/metal.2023.4639 (Zugang: Offen)
: Details im Forschungsportal „Research@Leibniz University“

BibTeX

@inproceedings{da08a165561744a19a71e0e01a2903a1,
title = "Experimental and numerical investigation of dynamic transformation induced plasticity during hot forming",
abstract = "Hot forging processes are influenced by numerous thermo-mechanical-metallurgical material phenomena, which interact strongly. In particular, the strains due to transformation-induced plasticity (TRIP) occurring during the forming process have a considerable influence on the distortion and residual stresses of the components. As TRIP strains are anisotropic they depend on the orientation and magnitude of the stress states superimposed to the phase transformation during cooling. By numerical modelling the impact of the TRIP effect can be analysed and taken into account during process design. However, required material data are poorly accessible to non-existent in literature. Therefore, this work focuses on the determination of characteristic values of TRIP for the material AISI 52100 considering dynamic effects. Tests were performed using hollow specimens which were thermo-mechanically loaded. An external stress was applied shortly before the start of the transformation and, in the case of reversible transformation plasticity, selectively released during the transformation phase. In this way, it was possible to determine phase-specific as well as load-dependent reversible transformation plasticity effects. The determined values for TRIP effect with and without backstress were transferred to a FE simulation and successfully validated with an experimental comparison. The material models and subroutines created are now to be validated on the basis of experimental forging tests by comparing distortion and residual stresses.",
keywords = "AISI 52100, FE-simulation, Hot forging, phase transformation, transformation-induced plasticity",
author = "Bernd-Arno Behrens and Johanna Uhe and Hendrik Wester and Christoph Kock and Norman Heimes",
note = "Publisher Copyright: {\textcopyright} 2024 TANGER Ltd., Ostrava.",
year = "2023",
month = jun,
day = "13",
doi = "10.37904/metal.2023.4639",
language = "English",
series = "METAL - International Conference on Metallurgy and Materials, Conference Proceedings",
pages = "164--169",
booktitle = "METAL Conference Proeedings",
}