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Titanium bar and titanium alloy have high chemical activity. Titanium rod and titanium alloy in the high temperature oxygen, nitrogen and other oxygen gas attack violent reaction. When heated in air, the surface of the billet forms an oxide skin and a surface inspiratory layer. Titanium rods and titanium alloys are easy to absorb hydrogen when heated, which makes it difficult to process some types of titanium alloys.
Poor thermal conductivity of titanium rod and titanium alloy. The thermal conductivity of titanium rod and titanium alloy generally as long as and recruit alloy thermal conductivity 1/15, 1/5 of the steel. The low thermal conductivity leads to a large temperature difference along the section between the ingot and the blank in the hot B inch, resulting in a large thermal response, which will form cracks in severe cases. Therefore, it is necessary to restrict the heating speed, and reasonably select the variable temperature, deformation speed, deformation rate and deformation equipment.
Polycrystalline change of titanium rod and titanium alloy. Titanium has a – phase transition. When heated to p temperature, the plasticity can be obviously improved and the deformation resistance can be reduced, but the deformation of the area is not in line with the arrangement of excellent performance.
The cold deformation of titanium alloy is low. The cold working deformation of most titanium alloys is difficult, and a little preheating (to 200~300T) can obviously reduce the deformation resistance and improve the plasticity.
Titanium tends to bond to the moulds of deformers. This tendency tends to deteriorate the surface quality of the machined material, and puts forward more stringent requirements on the smoothness of the moulds and processes of the deformers.
High flexural strength ratio and low elastic modulus. Straightening in a cold state is not easy.
The processing characteristics mentioned above should be fully considered in the formulation of the production process.
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