Journal
INTERNATIONAL JOURNAL OF FATIGUE
Volume 33, Issue 12, Pages 1592-1599Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.ijfatigue.2011.07.009
Keywords
Superalloys; Single crystal; Thermomechanical fatigue; Low cycle fatigue; Twinning
Funding
- MKE (Ministry of Knowledge Economy) [UCN215-2846.C]
- National Research Council of Science & Technology (NST), Republic of Korea [PNK2480] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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The cyclic deformation and lifetime behaviors of a single crystal nickel-based superalloy CMSX-4 have been investigated under out-of-phase thermomechanical fatigue (OP TMF) and isothermal low cycle fatigue (LCF) conditions. OP TMF life exhibited less than a half of LCF life although smaller inelastic strain range and lower mean stress level during OP TMF were observed compared to those during LCF. During OP TMF cycling, the maximum tensile strain at the minimum temperature was found to accelerate the surface crack initiation and propagation. Additionally, the multiple groups of parallel twin plates near crack provided a preferential path for crack propagation. (C) 2011 Elsevier Ltd. All rights reserved.
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