Research progress on microstructure evolution and hot processing maps of high strength β titanium alloys during hot deformation
(1. National Key Laboratory for Precision Hot Processing of Metals, Harbin Institute of Technology, Harbin 150001, China;
2. State Key Laboratory of Materials Processing and Die & Mould Technology, School of Materials Science and Engineering, Huazhong University of Science and Technology, Wuhan 430074, China;
3. School of Power and Mechanical Engineering, Wuhan University, Wuhan 430072, China;
4. State Key Laboratory of Nonferrous Metals & Processes, GRIMAT Engineering Institute Co., Ltd., Beijing 100086, China)
2. State Key Laboratory of Materials Processing and Die & Mould Technology, School of Materials Science and Engineering, Huazhong University of Science and Technology, Wuhan 430074, China;
3. School of Power and Mechanical Engineering, Wuhan University, Wuhan 430072, China;
4. State Key Laboratory of Nonferrous Metals & Processes, GRIMAT Engineering Institute Co., Ltd., Beijing 100086, China)
Abstract: High strength β titanium alloys are widely used in large load bearing components in the aerospace field. At present, large parts are generally formed by die forging. Different initial microstructures and deformation process parameters will significantly affect the flow behavior. To precisely control the microstructures, researchers have conducted many studies to analyze the microstructure evolution law and deformation mechanism during hot compression. This review focuses on the microstructure evolution of high strength β titanium alloys during hot deformation, including dynamic recrystallization and dynamic recovery in the single-phase region and the dynamic evolution of the α phase in the two-phase region. Furthermore, the optimal hot processing regions, instability regions, and the relationship between the efficiency of power dissipation and the deformation mechanism in the hot processing map are summarized. Finally, the problems and development direction of using hot processing maps to optimize process parameters are also emphasized.
Key words: high strength β titanium alloy; hot deformation; microstructure evolution; hot processing map