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Influence of grain size on the small fatigue crack initiation and propagation behaviors of a nickel-based superalloy at 650 °C

Authors :
Cong-Yang Gong
Run-Zi Wang
Cheng-Cheng Zhang
Yun-Fei Jia
Zhu Xumin
Yao Fu
Shan-Tung Tu
Xian-Cheng Zhang
Source :
Journal of Materials Science & Technology. 35:1607-1617
Publication Year :
2019
Publisher :
Elsevier BV, 2019.

Abstract

GH4169 at 650 °C in atmosphere was investigated by using single edge notch tensile specimens. The number of main cracks and crack initiation mechanisms at the notch surface strongly depended on the grain size. The crack initiation life accounted for more percentages of the total fatigue life for the alloy with smaller grain size. The fatigue life generally increased with increasing crack initiation life. The small crack transited to long crack when its length reached ˜10 times the grain size.

Details

ISSN :
10050302
Volume :
35
Database :
OpenAIRE
Journal :
Journal of Materials Science & Technology
Accession number :
edsair.doi...........1ec1be049155e6096f4c035e6106aa69