Corrosion–Fatigue Fracture of the Ultrafine-Grained PT-7M Titanium Alloy Fabricated by Rotary Forging

Corrosion–Fatigue Fracture of the Ultrafine-Grained PT-7M Titanium Alloy Fabricated by Rotary Forging

The corrosion–fatigue fracture of an ultrafine-grained Ti–2.2Al–2.5Zr pseudo-α titanium alloy (PT-7M alloy), which is used in atomic power engineering, is studied. The formation of an ultrafine-grained structure by rotary forging is found to increase the corrosion–fatigue strength. The parameters in...

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Veröffentlicht in:Russian metallurgy Metally 2020-07, Vol.2020 (7), p.767-778
Hauptverfasser: Chuvil’deev, V. N., Berendeev, N. N., Murashov, A. A., Kopylov, V. I., Nokhrin, A. V., Gryaznov, M. Yu, Likhnitskii, K. V., Tabachkova, N. Yu, Galaeva, E. A., Kotkov, D. N., Bakhmet’ev, A. M., Tryaev, T. V., Myshlyaev, M. M.
Format: Artikel
Sprache:eng
Schlagworte:
Chemistry and Materials Science
Corrosion
Corrosion fatigue
Crack propagation
Fatigue failure
Fatigue strength
Forging
Materials Science
Metallic Materials
Titanium alloys
Titanium base alloys
Ultrafines
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Zusammenfassung:The corrosion–fatigue fracture of an ultrafine-grained Ti–2.2Al–2.5Zr pseudo-α titanium alloy (PT-7M alloy), which is used in atomic power engineering, is studied. The formation of an ultrafine-grained structure by rotary forging is found to increase the corrosion–fatigue strength. The parameters in Basquin’s equation are determined, and the slope of the σ a –log  N fatigue curve is shown to nonmonotonically depend on the temperature of annealing of the ultrafine-grained alloy.
ISSN:0036-0295
1555-6255
1531-8648
DOI:10.1134/S0036029520070058