Datum
2019Autor
Sajadifar, Seyed VahidYapici, Guney GuvenDemler, EugenKrooß, PhilippWegener, ThomasMaier, Hans JürgenNiendorf, ThomasSchlagwort
620 Ingenieurwissenschaften 660 Chemische Verfahrenstechnik, Technische Chemie TitanUltrafeinkornPlastische DeformationMaterialermüdungZyklische BelastungStabilitätHochtemperaturMetadata
Zur Langanzeige
Aufsatz
Cyclic Deformation Response of Ultra-fine Grained Titanium at Elevated Temperatures
Zusammenfassung
This study focuses on the high-temperature cyclic deformation response (CDR) of ultra-fine grained (UFG) titanium of commercial purity (grade 4) processed via equal channel angular extrusion as a severe plastic deformation method. Low-cycle fatigue experiments were conducted at elevated temperatures up to 600 °C and at strain amplitudes ranging from 0.2% to 0.6%. Besides temperature and strain amplitude, the influence of two processing routes (8BC and 8E) on the fatigue characteristics of UFG Ti was examined. It is clearly revealed that the CDR of UFG Ti is not strongly affected by the alteration of strain path during ECAE processing, as long as highly efficient routes are employed. Both routes lead to high volume fraction of high angle grain boundaries and improved fatigue performance up to 400 °C is demonstrated. Electron backscatter diffraction assisted microstructural characterization was used to analyze elementary degradation mechanisms affecting cyclic mechanical behavior. Micrographs reveal the occurrence of severe recrystallization and grain growth only at temperatures above 400 °C and, thus, grade 4 UFG Ti is characterized by unprecedented cyclic stability in comparison to other UFG alloys.
Zitierform
In: International Journal of Fatigue Volume 122 (2019) , S. 228-239 ; eissn:1879-3452Zusätzliche Informationen
© This manuscript version is made available under the CC-BY-NC-ND 4.0 license https://creativecommons.org/licenses/by-nc-nd/4.0/Zitieren
@article{doi:10.17170/kobra-202312219265,
author={Sajadifar, Seyed Vahid and Yapici, Guney Guven and Demler, Eugen and Krooß, Philipp and Wegener, Thomas and Maier, Hans Jürgen and Niendorf, Thomas},
title={Cyclic Deformation Response of Ultra-fine Grained Titanium at Elevated Temperatures},
journal={International Journal of Fatigue},
year={2019}
}
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2023-12-22T12:55:56Z 2023-12-22T12:55:56Z 2019 doi:10.17170/kobra-202312219265 http://hdl.handle.net/123456789/15323 © This manuscript version is made available under the CC-BY-NC-ND 4.0 license https://creativecommons.org/licenses/by-nc-nd/4.0/ eng Attribution-NonCommercial-NoDerivatives 4.0 International http://creativecommons.org/licenses/by-nc-nd/4.0/ titanium ultra-fine grained severe plastic deformation fatigue cyclic stability elevated temperature 620 660 Cyclic Deformation Response of Ultra-fine Grained Titanium at Elevated Temperatures Aufsatz This study focuses on the high-temperature cyclic deformation response (CDR) of ultra-fine grained (UFG) titanium of commercial purity (grade 4) processed via equal channel angular extrusion as a severe plastic deformation method. Low-cycle fatigue experiments were conducted at elevated temperatures up to 600 °C and at strain amplitudes ranging from 0.2% to 0.6%. Besides temperature and strain amplitude, the influence of two processing routes (8BC and 8E) on the fatigue characteristics of UFG Ti was examined. It is clearly revealed that the CDR of UFG Ti is not strongly affected by the alteration of strain path during ECAE processing, as long as highly efficient routes are employed. Both routes lead to high volume fraction of high angle grain boundaries and improved fatigue performance up to 400 °C is demonstrated. Electron backscatter diffraction assisted microstructural characterization was used to analyze elementary degradation mechanisms affecting cyclic mechanical behavior. Micrographs reveal the occurrence of severe recrystallization and grain growth only at temperatures above 400 °C and, thus, grade 4 UFG Ti is characterized by unprecedented cyclic stability in comparison to other UFG alloys. open access Sajadifar, Seyed Vahid Yapici, Guney Guven Demler, Eugen Krooß, Philipp Wegener, Thomas Maier, Hans Jürgen Niendorf, Thomas doi:10.1016/j.ijfatigue.2019.01.021 Titan Ultrafeinkorn Plastische Deformation Materialermüdung Zyklische Belastung Stabilität Hochtemperatur acceptedVersion eissn:1879-3452 International Journal of Fatigue 228-239 Volume 122 false
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