Structural changes in 3al-2.5v titanium rods in hot extrusion

3al-2.5v titanium rods in hot extrusion processing what are the structural changes? The appearance of titanium rods is very similar to steel, the density of 4.51 g / cm 3, less than 60% of steel, is a refractory metal in the low density of the metal elements. The mechanical properties of titanium, commonly known as mechanical properties are very much related to purity. High purity titanium has excellent machinability, elongation, section shrinkage are good, but low strength, not suitable for structural materials.
Industrial pure titanium contains a moderate amount of impurities, with high strength and plasticity, suitable for the production of structural materials. Titanium and titanium alloy billet thermal conductivity is low, in the hot extrusion will make the surface layer and the inner layer produces a great temperature difference, when the temperature of the extrusion cylinder is 400 degrees, the temperature difference can reach 200 ~ 250 degrees.
In the suction strengthening and billet section has a large temperature difference under the joint influence of the billet surface and the center of the metal to produce very different strength properties and plastic properties, in the extrusion process will cause very uneven deformation, in the surface layer of the large additional tensile stresses, to become in the extrusion of the surface of the product to form cracks and cracks in the root cause.

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