Dear Dr. Mahdi Khodaparast,

titanium alloys are in competition with nickel-based alloys particularly in aerospace applications, where the lower density of titanium alloys is of advantage. For these applications fatigue strength is of primary importance.

I suggest to have a look at the following papers:

-Comparing fatigue behavior of titanium and nickel-based alloys

Joachim Albrecht

Materials Science and Engineering: A, Vol. 263, Issue 2, Pages 176-186 (1999)

Available at: https://www.sciencedirect.com/science/article/abs/pii/S0921509398011769

-An investigation of small fatigue crack behavior in titanium alloy TC4 under different stress levels

Lei Zhu, Xuteng Hu, Rong Jiang, Yingdong Song, Shoudao Qu

Proceedings of the Institution of Mechanical Engineers, Part G: Journal of Aerospace Engineering

Volume: 233 issue: 15, page(s): 5567-5578 (2019)

Available at: https://journals.sagepub.com/doi/full/10.1177/0954410019852867

-The Very High Cycle Fatigue Behaviour of Ti-6Al-4V Alloy

M.Janecek, F.Nový, P.Harcuba, J.Stráský, L.Trsko, M.Mhaede and L.Wagner

ACTA PHYSICA POLONICA A, 128 (4) 2015

Available at: http://przyrbwn.icm.edu.pl/APP/PDF/128/a128z4p06.pdf

-Fatigue behavior in nickel-based superalloys: A literature review

L. Garimella, P. K. Liaw & D. L. Klarstrom

JOM, Vol. 49, Article number: 67 (1997)

Available directly on web and at: https://link.springer.com/article/10.1007/BF02914771

-Microstructural aspects offatigue in Ni-base superalloys

Stephen D. Antolovich

Phil.Trans.R.Soc.A373: 20140128 (2014)

Available at: https://royalsocietypublishing.org/doi/pdf/10.1098/rsta.2014.0128

Enjoy reading and best regards, Pierluigi Traverso

https://link.springer.com/content/pdf/10.1007%2FBF02914771.pdf

Mahdi Khodaparast

Dear Dr. Pierluigi Traverso,

Thank you for taking the trouble to help me. I do appreciate it.

Dear Dr. Nassef,

Thank you for your kind consideration.

Galal Nassef

Dear Mehdi,

Both are competitive and can be used specially in aerospace applications. The lower density of titanium alloys is of advantage. Micro structurally, Titanium alloys with duplex microstructures are found to be superior to lamellar structures with respect to fatigue at high stress amplitudes (LCF regime) and to microcrack propagation. At low stress amplitudes and with respect to macrocrack propagation, the tendency is reversed. In nickel alloys, a dominating effect of crack nucleation at hard particles is observed, which masks the positive effects of increased yield stress by grain refinement or γ′ modifications.

Titanium

The microstructures of Ti-alloys are often duplex in nature, containing an intimate mixture of the high temperature ß-phase (bcc) and the low temperature a-phase (hcp). In general, the alloys fall into three major categories a, a/ß or ß. Above 873 K, simultaneaus oxide film formation and growth and oxygen dissolution into the metal forming a gas saturated layer are expected. Here, this might show very adverse effect on low cycle fatigue behavior. The fatigue properties depend also upon the a-grain size, the smaller the a-grain size the greater the fatigue resistance.

Nikel alloys

Besides the strength these materials need also resistance to fatigue loading including both high cycle fatigue from vibration or rotation bending and low cycle fatigue arising from the steep thermal gradients occurring during rapid start-up and shut-down of machineries. At 773 K a slight increase in crack growth and a small change in slope could be found. In, the threshold region at 773 K a very pronounced drop to a threshold value is apparent at R = 0.1 and R = 0.5. Here again the environmental effect (oxidation) plays an important role.

For more detail in depth refer this site may be quite useful for you.

file:///C:/Users/3020/Cookies/Desktop/Downloads/KFK3941%20(1).pdf

Ashish

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Dear Dr. Thakur,

thank you for your kind consideration but the file you shared seems to be missing. would you mind sending it to my email address again?

email: [email protected]

Ashish Thakur

thanks a lot again.

dear Mehadi,

file:///G:/Review%20on%20fracture/review%20on%20fracture/fatigue%20case%20studies/Reliabiliyt%20of%20fracture/KFK3941%20(1).pdf

Fatigue Data Compilation and Evaluation of Fatigue on Design

You may find it. No problem.

Ashish

Dear mehdi,

Does it work? if not, search by KERNFORSCHUNGSZENTRUM KARLSRUHE Institut für Technische Physik

Hope this is useful for you.

Ashish

Thanks a lot, Dr.Thakur.

Yes, it is so helpful.

Ashish Thakur

Paper: Effect of microstructure refinement on low cycle fatigue behavior of

Alloy 718