The Effect Of Hot Extrusion On The Properties Of Gr5 Titanium Bar Material

Gr5 titanium and titanium alloy bar blanks have low thermal conductivity, and during hot extrusion, the temperature difference between the surface and the inner layer is large, and the temperature difference between the surface of the extrusion cylinder during extrusion can reach 200~250 degrees.
Due to the large temperature difference between the suction reinforcement and the billet cross-section, the metal materials at the surface and center of the billet will produce extremely different strength properties and plastic properties, and the extrusion process will produce very uneven deformation, which will produce a large additional tensile stress in the extrusion process, and become the root cause of the surface cracking of the extruded products.
The results show that the hot extrusion process of titanium rods and titanium alloy bars is more complicated than that of aluminum alloys, copper alloys and even steel, which is determined by the special physical and chemical properties of titanium rods and titanium alloy bars.
Through the study of metal flow dynamics of industrial titanium alloys, it is found that there is a great difference in the flow behavior of the metal within the relative temperature zone of each alloy. Therefore, the billet heating temperature, which determines the state of the metal phase transition, is one of the main factors affecting the extrusion flow characteristics of titanium rods and titanium alloy bars.

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