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How to select and control deformation during the forging process of titanium alloy ingots?
Titanium and titanium alloy ingots have coarse grains and poor process plasticity. Generally, the ingot before forging is heated above the phase transition point, and the main deformation is completed in the zone. Because at this temperature, the deformation resistance is low and the plasticity is high, a large amount of deformation can be used to improve forging permeability, fully break the cast structure, and also improve productivity and reduce consumption.
Practice has proven that when the total deformation of the ingot reaches 70%~80% (i.e. forging ratio reaches 3.55), the coarse casting structure is basically broken by forging at an appropriate deformation speed within the specified deformation temperature, resulting in a more uniform and fine fiber structure. Its tensile strength and plasticity index are both improved. But in order to achieve better performance, further forging processing is still needed. When the deformation of the ingot opening is too low, the as cast structure cannot be effectively broken, resulting in poor performance and directly affecting the performance of the further processed product. Table 9-2 lists the suitable deformation ranges for commonly used titanium alloys in China after each heating.
