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Analysis on the difficulty of hot forming titanium alloy rod

The geometric accuracy deviation of titanium alloy rod is mainly caused by the elastic complex action of the material.The hot forming of titanium alloy bar is difficult because of its plasticity, deformation resistance and springback.

Hot forming of titanium alloy bar, the soft ratio effect of high temperature on the material, greatly reduces the distortion and springback of the parts after forming, but springback cannot be completely eliminated.Such as titanium alloy rod resistance heating drop pressure forming or punching distance forming.Field parts after hot forming there is still a small amount of springback, geometric accuracy does not meet the quality requirements, must carry out heavy manual dressing.

TC4 titanium alloy has a series of advantages such as excellent corrosion resistance, low density, high specific strength, good toughness and weldability, etc.The surface of TC4 titanium alloy will form a layer of oxide skin in the process of thermal forming.When the thermoforming temperature is about 600℃, the oxide skin is blue.When the thermoforming temperature is about 850℃, the oxide scale is grey and reddish.When the thermoforming temperature is 900℃, the oxide scale is grey.With the increase of temperature, the removal difficulty of oxide scale gradually increases.At home and abroad, the removal of titanium alloy oxide scale mostly adopts two-step method, that is, melting alkaline washing, then acid washing;However, the temperature of molten alkaline washing medium is higher, about 450℃, and easy to cause alpha + beta and beta titanium alloy semi-finished products premature aging enhancement, to further processing difficulties.In addition, hydrogen embrittlement corrosion on the surface of titanium alloy may be caused by hot alkali washing followed by nitric acid and hydrofluoric acid cleaning.

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