Effect of forging process on high cycle and very high cycle fatigue properties of TC4 titanium alloy under three‐point bending

The ultrasonic fatigue tests under two three‐point bending loading modes were carried out on TC4 specimens with the equiaxed, bimodal, and lamellar microstructure in the range of 105 to 109 cycles. The S‐N curves with different shapes were obtained, and it was found that the crack initiation in very...

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Bibliographic Details
Published inFatigue & fracture of engineering materials & structures Vol. 44; no. 8; pp. 2054 - 2069
Main Authors Wang, Bohan, Cheng, Li, Cui, Wenbin, Chen, Xuan, Wang, Changkai, Li, Dongchun
Format Journal Article
LanguageEnglish
Published Oxford Wiley Subscription Services, Inc 01.08.2021
Subjects
Axial stress
Bending fatigue
combined loading
Crack initiation
fatigue crack initiation
Fatigue tests
Forging
Fracture mechanics
fracture morphology
High cycle fatigue
Stress concentration
Stress distribution
titanium alloy
Titanium alloys
Titanium base alloys
very high cycle fatigue
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Summary:The ultrasonic fatigue tests under two three‐point bending loading modes were carried out on TC4 specimens with the equiaxed, bimodal, and lamellar microstructure in the range of 105 to 109 cycles. The S‐N curves with different shapes were obtained, and it was found that the crack initiation in very high cycle regime changed from surface to subsurface. The crack initiation mechanism with different microstructures was revealed by fracture analysis. The axial tension influence mechanism is that it changes the axial stress distribution on the specimen cross section and makes the crack origin migrate to the interior.
ISSN:8756-758X
1460-2695
DOI:10.1111/ffe.13476