Journal
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
Volume 654, Issue -, Pages 381-389Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2015.12.054
Keywords
Cast nickel base superalloy; Fatigue; Fracture; Deformation behaviour; Dislocation substructure
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Funding
- Defence Research and Development Organisation
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Cyclic deformation behaviour of conventionally cast and equiaxed grained nickel base superalloy CM247LC (R) has been studied at various strain amplitudes ranging from 0.3% to 0.9% at 870 degrees C. Two features typical of cast materials viz., shrinkage pores and carbide particles were seen to influence the crack initiation and propagation process during strain controlled LCF testing in the alloy. While low overall dislocation density marked the deformation substructures of specimens cycled at low strain amplitudes, dislocation density levels were higher at higher strain amplitudes and were also seen to increase with cycling especially in gamma channels and around carbide particles. Cyclic stress response and dual slope behaviour in Coffin-Manson plots exhibited by the alloy have been analysed in light of deformation substructures and fractographic observations to gain insight into the fatigue deformation process and fracture mechanisms operating in the alloy. (C) 2015 Elsevier B.V. All rights reserved.
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