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
Hauptverfasser: Kumar, Abhishek, Sarkar, Aritra, Nagesha, A., Harmain, G.A.
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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.
ISSN:0142-1123
1879-3452
DOI:10.1016/j.ijfatigue.2020.105612