Journal
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
Volume 528, Issue 13-14, Pages 4696-4702Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2011.02.068
Keywords
Twinning-induced plasticity (TWIP) steel; Low-cycle fatigue (LCF); High-cycle fatigue (HCF); Energy-based life prediction; Pre-strain
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Funding
- POSCO
- Korea Research Council of Fundamental Science and Technology (KRCF)
- National Research Council of Science & Technology (NST), Republic of Korea [K11009] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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The influence of pre-strain on the fatigue life behavior of Fe-18Mn twinning-induced plasticity (TWIP) steel was investigated by performing strain-controlled low-cycle fatigue (LCF) and stress-controlled high-cycle fatigue (HCF) tests with variation of the amount of pre-strain. The pre-strain to the as-received plate was achieved through a cold rolling process; thickness reductions of 10 and 30% were applied. The results revealed that both the LCF and HCF resistances were strongly dependent on the amount of pre-strain but showed vastly different effects; with increasing pre-strain, LCF resistance was degraded but HCF resistance was improved. An energy-based concept was adopted and modified to capture the pre-strain effect on the fatigue life behavior by considering the energy consumed by pre-straining. The developed model was further extended to establish a correlation between the LCF and HCF life data. The results showed that the HCF life behavior could be successfully predicted from the LCF life data. (C) 2011 Elsevier B.V. All rights reserved.
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