Journal
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
Volume 568, Issue -, Pages 239-245Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2012.12.069
Keywords
Nickel base superalloys; Fatigue; Electron microscopy
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In the present investigation, low cycle fatigue deformation behaviour of forged turbine disc of IN 718 superalloy of different sections (rim, hub, and bore) was studied under asymmetrical waveforms (slow-fast and fast-slow) at 650 degrees C. The superalloy exhibited dynamic strain aging (DSA) by showing the manifestation of serrations during the lower strain rate plastic region of the hysteresis loop under asymmetrical waveforms. Irrespective of different sections, the superalloy showed marginally reduced fatigue life under slow-fast waveform as compared to fast-slow waveform. This was attributed to higher accumulation of LCF damage under slow-fast waveform as confirmed from slip band spacing than that of the fast-slow waveform. (C) 2012 Elsevier B.V. All rights reserved.
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