Study on Creep-Fatigue Mechanical Behavior and Life Prediction of Ti2AlNb-Based Alloy

Low-cycle fatigue, creep and creep-fatigue tests of Ti2AlNb-based alloy were carried out at 550 °C. Compared with low-cycle fatigue, a creep-fatigue hysteresis loop has larger area and smaller average stress. The introduction of creep damage will greatly reduce the cycle life, and change the fatigue...

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Published inMaterials Vol. 15; no. 18; p. 6238
Main Authors Wang, Yanju, Wang, Xinhao, Yang, Yanfeng, Lan, Xiang, Zhang, Zhao, Li, Heng
Format Journal Article
LanguageEnglish
Published Basel MDPI AG 08.09.2022
MDPI
Subjects
Alloys
Crack initiation
Crack propagation
Creep fatigue
Creep tests
Damage accumulation
Deformation
Failure mechanisms
Fatigue failure
Fatigue life
Fatigue tests
Fracture mechanics
fracture mechanism
Hysteresis loops
Intermetallic compounds
Life prediction
Low cycle fatigue
Mechanical properties
Metal fatigue
Ti2AlNb-based alloy
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Summary:Low-cycle fatigue, creep and creep-fatigue tests of Ti2AlNb-based alloy were carried out at 550 °C. Compared with low-cycle fatigue, a creep-fatigue hysteresis loop has larger area and smaller average stress. The introduction of creep damage will greatly reduce the cycle life, and change the fatigue crack initiation point and failure mechanism. Based on the linear damage accumulation rule, the fatigue damage and creep damage were described by the life fraction method and the time fraction method, respectively, and the creep-fatigue life of the Ti2AlNb-based alloy is predicted within an error band of ±2 times.
Bibliography:ObjectType-Article-1
SourceType-Scholarly Journals-1
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These authors contributed equally to this work.
ISSN:1996-1944
1996-1944
DOI:10.3390/ma15186238