Fatigue Resistance of the Sheets of Heat-Resistant Titanium Alloys

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Abstract

The results of a study of the resistance to fatigue fracture of sheets made of heat-resistant titanium alloys VT18U (Ti–6.5Al–4.3Zr–2.4Sn–0.8Nb–0.7Mo–0.1Si, wt.%), VT8 (Ti–6.4Al–3.4Mo–0.3Si, wt.%), and VT25U (Ti–6.51Al–3.76Zr–1.71Sn–3.94Mo–0.5W–0.13Si, wt.%) has been presented. Fatigue curves have been obtained in the initial state and in the oxidized one after isothermal annealing at a temperature of 560 °C for 1000 h in air. It has been established that after annealing, the fatigue resistance of all oxidized alloys in the low-cycle region decreases by an order of magnitude. The fatigue limit of the oxidized alloys VT18U and VT25U does not change and is about 320 MPa. The high-cycle fatigue limit of the VT8 alloy decreases from 300 MPa in the initial state to 230 MPa in the oxidized state. It has been established that after annealing, the phase composition of an oxide of 250 nm in thickness on the surface of the alloys is different and contains the phases of anatase and rutile for the VT18U and VT25U alloys and contains predominantly rutile for the VT8 alloys, which is why the fatigue limit of the oxidized alloys differs.

About the authors

M. S. Kalienko

PSC VSMPO-AVISMA Corporation; Ural Federal University Named after the First President of Russia B.N. Yeltsin

Author for correspondence.
Email: kamak@yandex.ru
Russian Federation, Verkhnaya Salda, Sverdlovsk region, 624760; Ekaterinburg, 620002

A. A. Popov

Ural Federal University Named after the First President of Russia B.N. Yeltsin; Miheev Institute of Metal Physics, Ural Branch, Russian Academy of Sciences

Email: kamak@yandex.ru
Russian Federation, Ekaterinburg, 620002; Ekaterinburg, 620108

A. V. Volkov

PSC VSMPO-AVISMA Corporation

Email: kamak@yandex.ru
Russian Federation, Verkhnaya Salda, Sverdlovsk region, 624760

M. O. Leder

PSC VSMPO-AVISMA Corporation; Ural Federal University Named after the First President of Russia B.N. Yeltsin

Email: kamak@yandex.ru
Russian Federation, Verkhnaya Salda, Sverdlovsk region, 624760; Ekaterinburg, 620002

A. V. Zhelnina

PSC VSMPO-AVISMA Corporation; Ural Federal University Named after the First President of Russia B.N. Yeltsin

Email: kamak@yandex.ru
Russian Federation, Verkhnaya Salda, Sverdlovsk region, 624760; Ekaterinburg, 620002

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