期刊
INTERNATIONAL JOURNAL OF FATIGUE
卷 148, 期 -, 页码 -出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.ijfatigue.2021.106224
关键词
Ni-based single crystal superalloy; Pre-deformation; Very high cycle fatigue; Rejuvenation
资金
- Safran Aircraft Engines
- Contrat de Plan Etat -Region Nouvelle-Aquitaine (CPER)
- Fonds Europeen de Developpement Regional (FEDER)
- Nouvelle-Aquitaine French region through the ECOREVE project [2018-1R10122]
- Self-Heating ANR-Safran-Naval group research chair [ANR-20-CHIN-0002]
- Agence Nationale de la Recherche (ANR) [ANR-20-CHIN-0002] Funding Source: Agence Nationale de la Recherche (ANR)
The VHCF properties of the Ni-based single crystal superalloy AM1 with pre-deformation at 1000°C were studied. Pre-deformation did not result in life reduction under fully reversed conditions (R = -1), but decreased VHCF lifetime under high mean stress conditions (R = 0.5) with a shift in crack initiation from internal to surface. The pre-deformed material exhibited coarsened microstructure bands on slip planes, leading to surface roughness and initiation of fatal cracks. Rejuvenation heat treatment post pre-deformation could restore microstructure and fatigue life.
VHCF properties of the Ni-based single crystal superalloy AM1 with pre-deformation have been investigated at 1000 ?C. Pre-deformed material did not present life debit under fully reversed conditions (R = -1). Predeformation decreased VHCF lifetime under high mean stress conditions (R = 0.5) with a shift from internal to mode I surface crack initiation. The pre-deformed material has microstructure coarsened bands lying on the former {111} slip planes, facilitating microstructure shearing during VHCF at R = 0.5. Slip traces increased surface roughness, causing a surface recrystallization and initiation of the fatal crack from the surface. Rejuvenation heat treatment after pre-deformation can restore the microstructure and the fatigue life.
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