Generation of HCF-creep interaction diagram in Alloy 617M at 973 K
•The S-N curve was modified based on HCF-creep interaction tests.•The endurance limit shifted downwards in the modified S-N curve.•The modified endurance limit was a strong function of HCF block size and creep hold.•The test data was utilized to generate a HCF-creep interaction diagram. The influenc...
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Veröffentlicht in: | International journal of fatigue 2020-07, Vol.136, p.105612, Article 105612 |
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Sprache: | eng |
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Zusammenfassung: | •The S-N curve was modified based on HCF-creep interaction tests.•The endurance limit shifted downwards in the modified S-N curve.•The modified endurance limit was a strong function of HCF block size and creep hold.•The test data was utilized to generate a HCF-creep interaction diagram.
The influence of creep damage on high cycle fatigue (HCF) in Alloy 617M at 973 K was investigated in the present study by devising a novel method of incorporating periodic hold at the alternating stress/maximum stress. Under such HCF-creep interaction tests, the endurance limit was found to shift downwards compared to that obtained under HCF cycling. The modified endurance limit was found to be a strong function of HCF block size as well as the hold-time employed. This leads to modification of S-N curve, evolving scopes of re-evaluating the HCF design rules. The test data was further utilized to generate a HCF-creep interaction diagram. The knee-point which marks the allowable damage was found to be lower when a lower block-size is employed, indicating a strong block-size dependency of such diagram. The influence of creep on HCF cycling was also corroborated with fracture surface investigations showing significant intergranular cracking during such tests. |
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ISSN: | 0142-1123 1879-3452 |
DOI: | 10.1016/j.ijfatigue.2020.105612 |