Influence of Radial Shear Rolling Regimes on the Homogeneity of Structural-Phase State, Mechanical Properties and Fatigue of near β Titanium Alloy

Abstract:

The studies showed that as a result of radial-shear rolling (RSR) in the temperature range of 850-650°C the formation of a quasi-globular ultrafine grain-subgrain structure with a size of structural elements of about 0.5-0.7 μm is observed in near β titanium alloy Ti-5Al-5V-5Mo-1Cr-1Fe. Subsequent annealing (aging) in the temperature range of 450°C for 5 hours leads to the decomposition of the β-phase matrix deformed during the rolling process with the formation of nanosized acicular precipitates of the martensitic α" phase along with finely dispersed inclusions of α phase particles preserved after rolling. The formation of such ultrafine-grained (UFG) structure leads to a significant (more than 25%) increase in the strength properties of the alloy compared to the initial state while maintaining sufficient ductility (~5%). Also obtained by the method UFG titanium alloy exhibits a high fatigue strength under very high cycle loading (fatigue strength based on 10⁸ cycles exceeds 700 MPa).

• Periodical: Materials Science Forum (Volume 1016)
• Pages: 1024-1030
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.1016.1024
• Online since: January 2021
• Authors: Evgeny V. Naydenkin*, Ivan P. Mishin, Il'ya V. Ratochka, Olga Lykova, Anna I. Manisheva
• Keywords: Aging, Homogeneity, Mechanical Properties, Near β Titanium Alloy, Radial Shear Rolling, Very High Cycle Fatigue

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