Effect of hot rolling and annealing temperatures on the microstructure and mechanical properties of SP-700 alloy

Parnia Parvizian; Maryam Morakabati; Saeed Sadeghpour

doi:10.1007/s12613-019-1922-6

Volume 27 Issue 3

Mar. 2020

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Article Navigation > International Journal of Minerals, Metallurgy and Materials > 2020 > 27(3): 374-383

Parnia Parvizian, Maryam Morakabati, and Saeed Sadeghpour, Effect of hot rolling and annealing temperatures on the microstructure and mechanical properties of SP-700 alloy, Int. J. Miner. Metall. Mater., 27(2020), No. 3, pp. 374-383. https://doi.org/10.1007/s12613-019-1922-6

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Parnia Parvizian, Maryam Morakabati, and Saeed Sadeghpour, Effect of hot rolling and annealing temperatures on the microstructure and mechanical properties of SP-700 alloy, Int. J. Miner. Metall. Mater., 27(2020), No. 3, pp. 374-383. https://doi.org/10.1007/s12613-019-1922-6

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Research Article

Effect of hot rolling and annealing temperatures on the microstructure and mechanical properties of SP-700 alloy

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Corresponding author:
Maryam Morakabati E-mail: m_morakabati@mut.ac.ir
Received: 9 June 2019; Revised: 7 October 2019; Accepted: 9 October 2019; Available online: 6 November 2019

Abstract

Abstract

The effect of rolling temperature on both two- and single-phase regions and annealing in a temperature range of 700–950°C on the microstructure and mechanical properties of Ti‒5Al‒4V‒2Fe‒1Mo alloy was investigated. The results indicated that the best balance of strength and ductility is obtained by rolling in the two-phase region due to the globularization of the alpha phase and increase in its volume fraction. After rolling in the two-phase region, the ductility of the specimens annealed at 700 to 800°C increased because of the finer size and globularized alpha phase, while the reduction in strength was attributed to a decrease in the alpha phase volume fraction. However, at 950°C, the strength increased and ductility dropped by the formation of acicular alpha phase due to an increase in the phase boundary area. Annealing and aging after rolling in the beta-phase region increased the strength and decreased the ductility, which is attributed to the formation of a secondary alpha phase. A combination of favorable yield strength (1113 MPa) and elongation (13.3%) was obtained through rolling at 850°C followed by annealing at 750°C and aging at 570°C.
- beta-rich two phase Ti alloy;
- thermomechanical processing;
- tensile properties;
- microstructure

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