There are significant differences in temperature, process objectives, and performance effects between hot and cold processing of titanium plates. The specific comparison is as follows:
1. Temperature limits and physical mechanisms
Hot processing: carried out above the recrystallization temperature, such as hot rolling and forging. At high temperatures, titanium alloys undergo dynamic recrystallization, eliminating dislocation density and achieving uniform microstructure, but there may be residual rolling stress.
Cold working: carried out at room temperature or below the recrystallization temperature, resulting in work hardening through dislocation proliferation, increasing strength but decreasing plasticity.
2. Application scenarios
Hot processing: suitable for the preparation of large-sized billets.
Cold processing: used for high-precision components and scenarios with strict surface requirements.
3. In actual production, the combination of "hot rolling+cold rolling" is often used: hot rolling provides the basic billet, while cold rolling improves accuracy and performance. For example, TC4 titanium plate needs to be hot-rolled, cold-rolled to the target thickness, and then stress relieved through annealing.
Summary: Hot processing focuses on macro forming and microstructure optimization, while cold processing focuses on micro performance and precision control, complementing each other to meet different industrial needs.
