Journal
ENGINEERING FRACTURE MECHANICS
Volume 134, Issue -, Pages 433-450Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.engfracmech.2015.01.002
Keywords
Small crack; Fatigue; Replica; Grain size; GH4169
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Funding
- National Natural Science Foundations of China [51175177, 51371082, 51322510]
- New Century Excellent Talents in University [NCET-11-0643]
- Shanghai Pujiang Program and Key Research Program of Shanghai Science and Technology Committee [13DJ1400200]
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The aim of this paper was to identify the grain size effect on the small fatigue crack initiation and growth mechanisms of nickel-based superalloy GH4169. Results showed that there was a transition of fatigue crack initiation mechanism between fine-grained material and coarse-grained material. Small fatigue crack growth rates were almost constant across a wide range of crack lengths. Once the surface crack length reached the critical size of 200 mu m, the crack would propagate fairly quickly. At a given experimental condition, the scattering of fatigue lives of the parallel specimens was dependent on the crack initiation mechanisms. (C) 2015 Elsevier Ltd. All rights reserved.
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