The heat treatment method for the strength and toughness of 3D printed titanium alloy lattice structures: Firstly, prepare the 3D printed titanium alloy lattice structure; Then a solution treatment is carried out within a specific temperature range, followed by air cooling. The secondary solution is carried out again, and the solution treatment is conducted at a specific temperature, followed by air cooling. The treated material undergoes aging treatment and air cooling to obtain the 3D printed titanium alloy lattice structure material after heat treatment. The present invention enhances the toughness and strength of 3D printed titanium alloy lattice structures by adopting a combined heat treatment process of dual solution treatment and aging. Meanwhile, it eliminates the residual stress inside the material, improves the comprehensive mechanical properties of titanium alloy lattice structure materials, and expands the application fields of 3D printed titanium alloy lattice structure materials. It has reference value for the improvement of the performance of various 3D printed metal materials.
The heat treatment method for improving the strength and toughness of 3D printed titanium alloy lattice structures overcomes the microstructure defects and deficiencies of traditional 3D printed titanium alloy lattice structures. It has a short holding time, retains the fine-grained structure, effectively eliminates the residual stress in 3D printed materials, obtains the stress-relieved 3D printed fine-grained structure, and adopts the heat treatment method of double aging. By precisely controlling the microstructure morphology, content and scale, a controllable mixed microstructure can be obtained. The resulting material possesses both high strength and high toughness, with excellent comprehensive performance.
Due to the defects of high porosity, large internal residual stress and high brittleness of titanium alloy lattice structure materials prepared by 3D printing, a combined heat treatment process of dual solution treatment + aging is adopted to eliminate the internal stress. While the solution treatment and aging treatment eliminate the internal stress and improve the microstructure, they can also simultaneously enhance the plastic properties such as yield strength and elongation. This enables the comprehensive mechanical properties of the material to be excellent, thereby making the application scope of 3D printed titanium alloy lattice structure materials more extensive.
