Journal
INTERNATIONAL JOURNAL OF FATIGUE
Volume 151, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.ijfatigue.2021.106357
Keywords
Hybrid stress-strain controlled; Creep-fatigue interaction; Deformation behavior; Microstructure evolution
Funding
- National Natural Science Foundation of China [51905261]
- Natural Science Foundation of Jiangsu Province [BK20190678]
- National Key R&D Program of China [2018YFC0808800]
- Cultivation Program for The Excellent Doctoral Dissertation of Nanjing Tech University
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The results of HCFI tests on 9%Cr steel at 625 degrees C reveal that conservative dwell conditions lead to complex cyclic responses and low creep strain, ultimately resulting in strong creep-fatigue interaction damage.
The hybrid stress-strain controlled creep-fatigue interaction (HCFI) loadings at various dwell conditions were conducted on 9%Cr steel at 625 degrees C to investigate the deformation and damage mechanisms. Results reveal that the HCFI tests with conservative dwell conditions show complicated cyclic responses and low creep strain. The failure specimens demonstrate strong creep-fatigue interaction damage (CFID) with many branched surface cracks. With the increase in dwell stress and time, the HCFI tests show continuous softening and remarkable creep deformation. The creep-dominant damage (CDD) featured by internal creep cavities and blunt surface cracks leads to the final failure.
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