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Corporate Effects of Temperature and Strain Range on the Low Cycle Fatigue Life of a Single-Crystal Superalloy DD10
Z. D.; Wang Fan, D.; Lou, L. H.
2015
Source PublicationActa Metallurgica Sinica-English Letters
ISSN1006-7191
Volume28Issue:2Pages:152-158
AbstractLow cycle fatigue behavior of a nickel-based single-crystal superalloy DD10 was investigated at 760 and 980 degrees C under different strain ranges. Results show that the fatigue life (N-f) of DD10 alloy exhibits different temperature dependence under various strain ranges. Under low strain range, the alloy exhibits a longer N-f at 760 degrees C than that at 980 degrees C. However, under high strain range, a reverse result is obtained. This difference can be attributed to the change of dominant damage modes under various test conditions, which is manifested in different modes of crack initiation (crack nucleation and its early propagation). At 760 degrees C, the crack initiates at pores in subsurface due to local stress concentration. This process is mainly controlled by plastic amplitude and plastic property, but not affected by oxygen-induced damage before the crack propagates to the surface. At 980 degrees C, the crack initiates at surface instead of pores due to the more homogeneous plastic deformation and the disharmony between the external oxidation layer and the bulk material when the strain amplitude is high. At that temperature, the process is mainly controlled by oxidation damage and strain amplitude simultaneously. Therefore, under high strain range, the crack initiation is much easier at 760 degrees C due to plastic deformation and the poor plasticity, while under low strain range obvious oxidation damage at 980 degrees C may accelerate the crack initiation.
description.department[fan, zhi-dong ; wang, dong ; lou, lang-hong] chinese acad sci, inst met res, shenyang 110016, peoples r china. ; wang, d (reprint author), chinese acad sci, inst met res, shenyang 110016, peoples r china. ; dwang@imr.ac.cn
KeywordLow Cycle Fatigue Single-crystal Superalloy Temperature Strain Crack Initiation Ni-base Superalloy Degrees-c Behavior Cmsx-4 Creep Deformation Damage M963
URL查看原文
Language英语
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/73794
Collection中国科学院金属研究所
Recommended Citation
GB/T 7714
Z. D.,Wang Fan, D.,Lou, L. H.. Corporate Effects of Temperature and Strain Range on the Low Cycle Fatigue Life of a Single-Crystal Superalloy DD10[J]. Acta Metallurgica Sinica-English Letters,2015,28(2):152-158.
APA Z. D.,Wang Fan, D.,&Lou, L. H..(2015).Corporate Effects of Temperature and Strain Range on the Low Cycle Fatigue Life of a Single-Crystal Superalloy DD10.Acta Metallurgica Sinica-English Letters,28(2),152-158.
MLA Z. D.,et al."Corporate Effects of Temperature and Strain Range on the Low Cycle Fatigue Life of a Single-Crystal Superalloy DD10".Acta Metallurgica Sinica-English Letters 28.2(2015):152-158.
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