Effect of hot rolling and annealing temperatures on the microstructure and mechanical properties of SP-700 alloy
来源期刊：International Journal of Minerals Metallurgy and Materials2020年第3期
论文作者：Parnia Parvizian Maryam Morakabati Saeed Sadeghpour
文章页码：374 - 383
摘 要：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-5 Al-4 V-2 Fe-1 Mo 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.
Parnia Parvizian，Maryam Morakabati，Saeed Sadeghpour
Metallic Materials Research Center, Malek Ashtar University of Technology
摘 要：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-5 Al-4 V-2 Fe-1 Mo 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.
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