2022年2月23日星期三

The main characteristics of titanium rod and titanium alloy material processing

Titanium rods and titanium alloys have high chemical activity. titanium rods and titanium alloys are prone to violent reactions with oxygen, nitrogen and other oxygen-containing gases at high temperatures. When the surface of the billet is heated in air, an oxide scale and a surface getter layer are formed. Titanium rods and titanium alloys are easy to absorb hydrogen when heated, which causes difficulties in the processing of certain types of titanium alloys.

The thermal conductivity of titanium rods and titanium alloys is poor. The thermal conductivity of titanium rods and titanium alloys is usually only 1/15 of the thermal conductivity of aluminum alloys and 1/5 of steel. The low thermal conductivity leads to a large temperature difference along the section of the ingot and the billet in the hot B inch, resulting in a large thermal stress, and cracks will be formed in severe cases, so the heating speed must be limited, and the variable temperature, deformation speed, Deformation rate, deformation equipment.

Polycrystalline transformation of titanium rods and titanium alloys. Titanium has a-β phase transition. Heating to the p temperature can significantly improve the plasticity and reduce the deformation resistance, but the deformation of the β region is not enough to obtain the organization with good performance.

The cold deformation ability of titanium alloy is low. The cold working deformation of most titanium alloys is difficult, and a little preheating (to 200~300T) can significantly reduce the deformation resistance and improve the plasticity.

Titanium is easy to bond and deform molds. This tendency is easy to deteriorate the surface quality of the processed material, and puts forward more stringent requirements for deformation tools and process lubrication.

High yield ratio and low elastic modulus. Straightening in the cold state is very difficult.

The above processing characteristics should be fully considered when formulating the production process.

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