The effects of hot rolling and cold rolling processes on the performance of GR5 rolled titanium tubes are mainly reflected in their microstructure, mechanical properties, and processing characteristics.
1. Processing Temperature and Deformation Characteristics
A. Hot Rolling: Performed at high temperatures of 900–1000°C. The material exhibits high plasticity and low resistance to deformation, making it suitable for large deformation processing, but with lower dimensional accuracy and surface quality.
B. Cold Rolling: Performed at room temperature. The resistance to deformation is 3–5 times that of hot rolling, requiring multiple passes with small reductions in thickness. However, it can achieve high precision and a smooth, bright surface.
2. Microstructure and Mechanical Properties
A. Hot-rolled tubes: Dynamic recrystallization at high temperatures forms a fibrous microstructure with large grains, but exhibits less anisotropy. It has lower yield strength but higher elongation, making it suitable for subsequent deep processing.
B. Cold-rolled tubes: Dislocation density increases significantly, forming submicron-sized grains, resulting in pronounced work hardening. Yield strength increases to 800-1000 MPa, but elongation decreases; annealing is required to restore ductility.
3. Differences in Application Scenarios
A. Hot-rolled tubes: Suitable for applications requiring high formability, such as aerospace engine components and chemical heat exchangers.
B. Cold-rolled tubes: Commonly used in applications requiring high strength and precise dimensions, such as medical implants and precision instruments.
4. Process Cost and Efficiency
A. Hot rolling offers high efficiency and low cost, but requires subsequent acid cleaning to remove the oxide layer;
B. Cold rolling is a more complex and time-consuming process, but it can directly meet high surface quality requirements.
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