Titanium alloys have been widely used in aerospace and other fields due to their excellent properties such as low density, high specific strength and creep resistance. Titanium alloys have the characteristics of low ductility, high deformation resistance and obvious anisotropy, so titanium alloys are very sensitive to thermal deformation process parameters.
Application of simulation technology in the field of titanium alloy hot processing Titanium alloys usually need to be hot processed in the β single-phase region or the αβ two-phase region to obtain products with certain microstructure and properties. The choice of hot working parameters has an important influence on the machining properties and microstructure of titanium alloys. In recent years, domestic research in the field of titanium alloy hot processing has been increasing, and the application of thermal simulation technology and numerical simulation technology in the hot deformation mechanism and microstructure evolution law of titanium alloy is particularly prominent.
Typical applications of thermal simulation technology Many scholars have carried out thermal compression deformation experiments on different types of titanium alloys using thermal/mechanical simulation testing machines, and obtained the flow stress curve of the material, that is, the stress-strain relationship. The flow stress curve reflects the internal relationship between the flow stress and the deformation process parameters, and is also the macroscopic manifestation of the internal structure change of the material. Xu Wenchen et al. conducted a constant strain rate compression deformation test on a thermal simulator, studied the dynamic thermal deformation behavior of TA15 titanium alloy, calculated the deformation activation energy Q of the material and observed the thermal deformation structure. Dynamic recrystallization in the α phase region is the main softening mechanism of the material, while in the β phase region the softening mechanism is dominated by dynamic recovery.
Typical application of numerical simulation technology Since the numerical simulation technology makes the titanium alloy hot working process can be reproduced on the computer, so the enterprise producers and scientific researchers use this technology to study the relationship between the ideal process parameters and the corresponding organization and mechanical properties. To achieve the purpose of optimizing the current production process and reducing the development cost of new products, new processes and new materials. Shao Hui [11] et al. studied the α-phase evolution of the flaky TC21 titanium alloy during the forging process in the two-phase region. The variation law of temperature field and strain field in the forging process was simulated and analyzed by DEFORM software, and the morphology change of α phase was quantitatively analyzed. The smaller the Feret Ratio, the more spherical the morphology. The results show that the strain field and temperature field affect the evolution of the flaky phase. Under the condition of lower strain, the temperature at the edge of the forging material decreases rapidly, the recrystallization is sufficient, and the temperature at the center of the forging material is higher.
