Journal
INTERNATIONAL JOURNAL OF FATIGUE
Volume 97, Issue -, Pages 190-201Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.ijfatigue.2017.01.002
Keywords
Creep-fatigue; Nickel-based superalloy; Microstructure; Failure mechanism; Oxidation
Funding
- National Natural Science Foundations of China [51371082, 51322510]
- 111 project
- Shanghai Pujiang Program
- Young Scholar of the Yangtze River Scholars Program
- Shanghai Technology Innovation Program of SHEITC [CXY-2015-001]
- Centre for Manufacturing and Materials Engineering at Coventry University
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The aim of the present paper is to identify the effects of sampling locations and loading waveforms on high-temperature low-cycle fatigue (HTLCF) and creep-fatigue life of a forged and precipitation hardened nickel-based GH4169 superalloy. Both the deformation and failure mechanisms are considered here. It has been revealed that HTLCF and creep-fatigue life of specimens were influenced by inhomogeneous microstructures at different locations. Compared with the HTLCF tests, the presence of dwell times in creep-fatigue tests tended to reduce number of cycles to failure. Intergranular damage was observed at both crack initiation and propagation stages. For the dwell times under tension, the intergranular damage was mainly associated with precipitate-assist voids. However, oxidation accounted for the presence of intergranular damage for the dwell times under compression. (C) 2017 Elsevier Ltd. All rights reserved.
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