期刊
ENGINEERING FRACTURE MECHANICS
卷 142, 期 -, 页码 140-153出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.engfracmech.2015.06.003
关键词
Multi-scale fatigue crack; Crack growth rate; Grain size; Grain boundary; Nickel-based alloy
类别
资金
- National Natural Science Foundations of China [51175177, 51371082, 51322510]
- Shanghai Pujiang Program
- Key Research Program of Shanghai Science and Technology Committee [12JC1403200, 13DJ1400200]
The mechanism of multi-scale fatigue crack propagation of Nickel-bases alloy GH4169 with different grain sizes was identified in this paper by using the specimens with micro-notches. Results showed that specimen with coarser grain exhibited longer fatigue life. Grain size effect on the growth rate of small crack cannot be distinguished due to the fluctuation of crack growth rate. The small fatigue crack stage accounted for a larger fraction of the total fatigue life for the specimen with finer grain size. An empirical formula was proposed to predict the relationship between the growth rate of small crack and crack length. (C) 2015 Elsevier Ltd. All rights reserved.
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