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Fretting Fatigue Lives of Heat Resisting Alloys Closely Relating to Temperature.

Ni-base superalloys and Titanium alloys have been making big contribution to develop land-based and aerospace gas turbines. However, the lives of these alloys are often sensitive to the contact stress field, wear and fretting. The fretting fatigue (FF) damage occurs due to small relative displacements between mating parts such as turbine blade-disk assembly during engine operation. In this work, at first the fretting fatigue lives of a Ni-base superalloy and titanium alloy were examined: here the experimental variables were; combination between these materials and the counterpart material, test temperature, and the surface topologies of contact pad. Through the work special attention has been paid to get metallurgical and mechanical aspects of the FF damage. The experimental works…

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Ni-base superalloys and Titanium alloys have been making big contribution to develop land-based and aerospace gas turbines. However, the lives of these alloys are often sensitive to the contact stress field, wear and fretting. The fretting fatigue (FF) damage occurs due to small relative displacements between mating parts such as turbine blade-disk assembly during engine operation. In this work, at first the fretting fatigue lives of a Ni-base superalloy and titanium alloy were examined: here the experimental variables were; combination between these materials and the counterpart material, test temperature, and the surface topologies of contact pad. Through the work special attention has been paid to get metallurgical and mechanical aspects of the FF damage. The experimental works demonstrated that the FF strength was significantly reduced, compared with the PF, and that the FF crack was predominantly initiated from so-call the stick/slip boundary (Figure 1). It was also reconfirmed that the role of tangential force coefficient played the most key roles in the FF life reduction, which was also closely related to the temperature dependence in the lives.

Reference
LCF9-2022-015

Author(s)
M. Okazaki
DOI
10.48447/LCF9-2022-015
Event
LCF9 - Ninth International Conference on Low Cycle Fatigue
Year of publication
2022
Publication type
conference paper (PDF)
Language
English
Keywords
Fretting fatigue,Heat Resisting Alloys,Temperature,Tangential force