Analysis of depth effect of rolling temperature on microstructure and properties of titanium forgings

In the forging process of titanium alloy, the original microstructure characteristics of the blank, including its chemical composition, impurity distribution, selection of hot working process parameters and subsequent heat treatment process, will have a profound impact on the microstructure and mechanical properties of the final forging.

First of all, talking about the choice of rolling temperature, this is a crucial link. When the rolling temperature specification is properly selected and the billet can obtain a large deformation rate in the forging process, the adverse effects of the original structure can be effectively eliminated. However, in a real industrial production environment, achieving such a high deformation rate is not easy. With the reduction of deformation rate, the adverse effects of the original structure gradually become prominent, which poses a potential threat to the quality of the forgings.

Taking titanium and titanium alloy ingot as an example, the original structure often presents coarse grain and low process plasticity. In order to improve this situation, the heating process before forging is particularly important. The strategy of heating the ingot above the phase transition point and completing the main deformation process in the β zone proved to be effective. In the β zone, the deformation resistance of the material is significantly reduced, and the plasticity is greatly increased, which allows the as-cast structure to be broken more fully, thereby improving production efficiency and reducing energy consumption.

Further research and practice prove that when the total deformation of the ingot reaches 70%~80%, the internal structure of the forging will change significantly. The originally coarse grain is refined to form a uniform and fine fiber structure. This change in organizational structure not only improves the tensile strength of the material, but also significantly improves its plasticity index, making the forgings more tough and durable when subjected to external forces.

In addition, the selection of rolling temperature also needs to consider the specific composition of the material and impurities. Different composition and impurity content of titanium alloy have different effects on the selection of rolling temperature and microstructure evolution during forging. Therefore, in actual operation, it is necessary to formulate reasonable rolling temperature specifications and forging process parameters according to the specific titanium alloy material to ensure the best quality and performance of the forging.

In summary, the rolling temperature has a profound effect on the microstructure and properties of titanium forgings. In the forging process, it is necessary to strictly control the rolling temperature and optimize the original structure of the blank to ensure the best quality of the forging. At the same time, it is also necessary to formulate reasonable forging process parameters and heat treatment process according to the specific titanium alloy material, in order to further improve the mechanical properties and service life of the forging.