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

作　　者：Parnia Parvizian Maryam Morakabati Saeed Sadeghpour 

机构地区：[1]Metallic Materials Research Center, Malek Ashtar University of Technology

出　　处：《International Journal of Minerals,Metallurgy and Materials》2020年第3期374-383,共10页矿物冶金与材料学报（英文版）

基　　金：Metallic Materials Research Center of Malek Ashatr University of Technology,Iran,for useful technical help and financial supports for this research

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.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.

关 键 词：beta-rich two phase Ti alloy thermomechanical processing tensile properties MICROSTRUCTURE 

分 类 号：TG335.11[金属学及工艺—金属压力加工] TG156.2[一般工业技术—材料科学与工程] TG146.23[金属学及工艺—金属材料]