Influence of grain size on the small fatigue crack initiation and propagation behaviors of a nickel-based superalloy at 650 °C
| Autor: | Cong-Yang Gong, Run-Zi Wang, Cheng-Cheng Zhang, Yun-Fei Jia, Zhu Xumin, Yao Fu, Shan-Tung Tu, Xian-Cheng Zhang |
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| Rok vydání: | 2019 |
| Předmět: |
Materials science
Polymers and Plastics Mechanical Engineering Alloy Metals and Alloys Fatigue testing 02 engineering and technology Nickel based Edge (geometry) engineering.material 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences Grain size 0104 chemical sciences Superalloy Mechanics of Materials mental disorders Ultimate tensile strength Crack initiation Materials Chemistry Ceramics and Composites engineering Composite material 0210 nano-technology |
| Zdroj: | Journal of Materials Science & Technology. 35:1607-1617 |
| ISSN: | 1005-0302 |
| DOI: | 10.1016/j.jmst.2019.03.023 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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