Application of Titanium Plates in Ocean Power Plants
Gr17 Titanium Plate has been widely used in aerospace and other fields because of its excellent properties such as low density, high specific strength and creep resistance. Titanium alloy has the characteristics of low ductility, high deformation resistance and obvious anisotropy, so titanium alloy is very sensitive to thermal deformation process parameters.
Application of simulation technology in the field of titanium alloy thermal processing
Gr17 Titanium Plate usually requires thermal processing in the β single-phase region or α β two-phase region to obtain products with certain structures and properties. The choice of thermal processing parameters has an important impact on the processing properties and microstructure of titanium alloys. In recent years, domestic research in the field of thermal processing of titanium alloys has been increasing, and the application of thermal simulation technology and numerical simulation technology in the thermal deformation mechanism and microstructure evolution of titanium alloys is particularly prominent.
Typical application 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 at the same time, it is also a 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 to study 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 is the main softening mechanism in the α phase region, while dynamic recovery is the main softening mechanism in the β phase region.
Typical application of numerical simulation technology
Since the numerical simulation technology enables the thermal processing process of titanium alloy to be reproduced on the computer, manufacturers and scientific researchers use this technology to study the relationship between ideal process parameters and corresponding microstructure and mechanical properties, so as to optimize the current production process and The purpose of reducing the development cost of new products, new processes and new materials. Shao Hui et al. studied the α-phase evolution of TC21 titanium alloy with lamellar structure during forging in the two-phase region. DEFORM software was used to simulate and analyze the change law of temperature field and strain field in the forging process, and quantitatively analyze the shape change of α phase. The smaller the Feret Ratio, the shape tends to be spherical. The results show that the strain field and the temperature field affect the evolution of the sheet phase. Under the lower strain condition, the temperature of the edge of the forging material decreases rapidly, the recrystallization is sufficient, and the temperature at the center of the forging material is higher.
Simulation study on microstructure evolution
The diversity of the microstructure of Gr17 Titanium Plate is regularly related to the multi-process production process of titanium alloy and the diversity of each process. This complex connection determines that it is difficult to predict and control the microstructure and properties of titanium alloys by traditional methods. With the development of computer and numerical simulation technology in recent years, the numerical simulation method of microstructure has become a powerful tool to obtain the quantitative relationship between the influence of main process parameters on the macroscopic and microstructure of hot forming workpieces. Using numerical simulation technology to reproduce the evolution process of microstructure can not only deepen the understanding of the mechanism of structure change, promote the development of existing theories, but also improve the structure of materials and optimize the preparation process of materials, so as to obtain the expected mechanical properties of materials.
Compared with the traditional trial-and-error method, using simulation technology as a research and development method can shorten the development cycle, reduce production costs, and optimize the production process, so as to achieve the purpose of improving production efficiency and increasing economic benefits. Due to the high price and long production cycle of titanium alloy, the research on its production process urgently needs simulation technology to open up shortcuts for it, and overcome the problems of narrow thermal processing temperature range and complex and diverse relationship between process-structure-performance.
At home and abroad, thermal simulation technology and numerical simulation technology have been used to carry out a lot of research work on the thermal deformation mechanism and microstructure evolution of titanium alloys. Improve the role and effect of product quality. However, due to the inaccurate material performance data, the fact that the boundary conditions and friction parameters are difficult to be close to reality, and the study of macroscopic variables does not involve microstructure changes and other factors, there are certain errors in the simulation results compared with the actual production.
In the future, research on the thermal deformation mechanism and microstructure evolution of titanium alloys must organically combine physical simulation technology and numerical simulation technology to establish a macroscopic finite element model that is more in line with the actual production process, and couple it with the microstructure evolution model to strive for simulation results. It can not only provide a theoretical basis for on-site production, but also quantitatively guide the on-site process, and finally achieve the purpose of real-time tracking of deformation process and control of product quality.
