Titanium plates usually need to be β Single phase zone or α+β The product with certain structure and properties can be obtained by hot working in the two-phase zone. The selection of hot working parameters has an important impact on the processing properties and microstructure of titanium plate. In recent years, the domestic research in the field of hot working of titanium plate is increasing, and the application of thermal simulation technology and numerical simulation technology in the thermal deformation mechanism and microstructure evolution of titanium plate is particularly prominent. Many scholars have conducted hot compression deformation experiments on different types of titanium plates using thermal/mechanical simulation testing machines, and obtained the flow stress curve of the material, which is the stress-strain relationship. The flow stress curve reflects the internal relationship between flow stress and deformation process parameters, and is also a macroscopic manifestation of internal structural changes in materials. Xu Wenchen et al. conducted constant strain rate compression deformation tests on a thermal simulator to study the dynamic thermal deformation behavior of TA15 titanium plate, calculated the deformation activation energy Q of the material, and observed the thermal deformation microstructure. stay α Dynamic recrystallization in the phase zone is the main softening mechanism of materials, while in the β The softening mechanism of the phase zone is mainly dynamic recovery.
Compared with traditional process trial and error methods, adopting simulation technology as a research and development tool can shorten the development cycle, reduce production costs, optimize production processes, and achieve the goal of improving production efficiency and increasing economic benefits. However, due to the high price and long production cycle of titanium plate, the research of its production process urgently needs simulation technology to open a shortcut for it, and overcome the problems such as narrow temperature range of hot working, complex and diverse process structure performance relationship, etc. Because the numerical simulation technology enables the hot working process of titanium plate to be truly reproduced on the computer, enterprise producers and scientific research workers use this technology to study the relationship between ideal process parameters and corresponding structures and mechanical properties, so as to optimize the current production process and reduce the development cost of new products, new processes and new materials. Shao Hui et al. studied the effect of lamellar structure on the forging process of TC21 titanium plate in the two-phase zone α Phase evolution. The DEFORM software was used to simulate and analyze the changes in temperature and strain fields during the forging process, and quantitative analysis was conducted α The smaller the Feret Ratio, the more spheroidized the morphology of the phase changes. The results indicate that the strain field and temperature field affect the evolution of the sheet-like phase. Under lower strain conditions, the edge of the forging material undergoes rapid temperature reduction and sufficient recrystallization, resulting in a higher temperature at the center of the forging material.
The diversity of titanium plate microstructure is regularly related to the production process of multiple processes and the diversity of each process. This complex connection makes it difficult for traditional methods to predict and control the microstructure and properties of titanium plates. With the development of computer and numerical simulation technology in recent years, microstructure numerical simulation methods have become a powerful tool for obtaining quantitative relationships between the main process parameters and the macroscopic and microscopic structures of hot formed workpieces. The use of numerical simulation technology to reproduce the evolution process of microstructure can not only deepen the understanding of the mechanism of tissue change and promote the development of existing theories, but also improve the material structure and optimize the material preparation process, thereby obtaining the expected mechanical energy of the material.
A large amount of research has been conducted on the thermal deformation mechanism and microstructure evolution of titanium plates using thermal and numerical simulation techniques both domestically and internationally. Results have been obtained on the relationship between force and energy parameters, process parameters, and microstructure, which can optimize production processes and improve product quality. However, due to factors such as inaccurate material performance data, difficulty in fitting boundary conditions and friction parameters to reality, and the lack of involvement of microstructure changes in macroscopic variable research, there are certain errors in simulation results compared to actual production. In the future, research on the hot deformation mechanism and microstructure evolution law of titanium plates needs to organically combine physical simulation technology and numerical simulation technology, establish a macroscopic finite element model that is more in line with the actual production process, and couple it with the microstructure evolution model. The simulation results should not only provide theoretical basis for on-site production, but also quantitatively guide on-site processes, and ultimately achieve real-time tracking of the deformation process The purpose of controlling product quality.