Details
| Original language | English |
|---|---|
| Pages (from-to) | 228-239 |
| Number of pages | 12 |
| Journal | International Journal of Fatigue |
| Volume | 122 |
| Early online date | 2 Feb 2019 |
| Publication status | Published - May 2019 |
Abstract
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 (8B C 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.
Keywords
- Cyclic stability, Fatigue, High temperature, Severe plastic deformation, Titanium, Ultra-fine grained
ASJC Scopus subject areas
- Mathematics(all)
- Modelling and Simulation
- Materials Science(all)
- General Materials Science
- Engineering(all)
- Mechanics of Materials
- Engineering(all)
- Mechanical Engineering
- Engineering(all)
- Industrial and Manufacturing Engineering
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In: International Journal of Fatigue, Vol. 122, 05.2019, p. 228-239.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Cyclic deformation response of ultra-fine grained titanium at elevated temperatures
AU - Sajadifar, S. V.
AU - Yapici, G. G.
AU - Demler, E.
AU - Krooß, P.
AU - Wegener, T.
AU - Maier, H. J.
AU - Niendorf, T.
N1 - Funding Information: Support from the EU-FP7 Marie Curie Career Integration Grant ( 304150 -BUNSMAT) is acknowledged. Authors also thank the Hessen State Ministry of Higher Education, Research and the Arts – Initiative for the Development of Scientific and Economic Excellence (LOEWE) for support through the project ‘Safer Materials’.
PY - 2019/5
Y1 - 2019/5
N2 - 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 (8B C 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.
AB - 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 (8B C 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.
KW - Cyclic stability
KW - Fatigue
KW - High temperature
KW - Severe plastic deformation
KW - Titanium
KW - Ultra-fine grained
UR - http://www.scopus.com/inward/record.url?scp=85061118789&partnerID=8YFLogxK
U2 - 10.1016/j.ijfatigue.2019.01.021
DO - 10.1016/j.ijfatigue.2019.01.021
M3 - Article
AN - SCOPUS:85061118789
VL - 122
SP - 228
EP - 239
JO - International Journal of Fatigue
JF - International Journal of Fatigue
SN - 0142-1123
ER -