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Effect of grain size on the very high cycle fatigue behavior and notch sensitivity of titanium

Sajadifar, Seyed Vahid
Wegener, Thomas
Yapici, Guney Guven
Niendorf, Thomas

The very high-cycle fatigue performances of coarse-grained and ultrafine-grained titanium samples with different geometries at ambient temperature and various stress amplitudes were investigated. Severe plastic deformation improves monotonic strength of titanium at the cost of a loss in ductility. Ultrafine-grained titanium demonstrates a superior fatigue performance compared to that of coarse-grained counterparts in the high-cycle fatigue regime, however, suffers notch sensitivity. Furthermore, in the very high-cycle fatigue regime stress-life curves merge unexpectedly. Microstructural inhomogeneity in the ultrafine-grained titanium is expected to be the reason. Analysis of fracture surfaces reveals that the formation of fatigue slip marks is evident on the fatigued samples of both microstructural states. Ultrafine-grained titanium is more prone to the intergranular fracture.

Citation
In: Theoretical and Applied Fracture Mechanics Volume 104 / (2019) , S. ; eissn:1872-7638
Collections
@article{doi:10.17170/kobra-202312229273,
  author    ={Sajadifar, Seyed Vahid and Wegener, Thomas and Yapici, Guney Guven and Niendorf, Thomas},
  title    ={Effect of grain size on the very high cycle fatigue behavior and notch sensitivity of titanium},
  keywords ={600 and 620 and Ultrafeinkorn and Titan and Strangpressen and Ermüdung bei sehr hohen Lastspielzahlen and Plastische Deformation and Kerbwirkung and Bruchverhalten},
  copyright  ={http://creativecommons.org/licenses/by-nc-nd/4.0/},
  language ={en},
  journal  ={Theoretical and Applied Fracture Mechanics},
  year   ={2019}
}