Continuous multi-step thermal hydrogen treatment process for improving room-temperature plasticity of TC4 titanium alloy

Abstract

The invention discloses a continuous multi-step thermal hydrogen treatment process for improving room-temperature plasticity of a TC4 titanium alloy. The process comprises the steps of performing surface treatment on a TC4 titanium alloy sample, heating the sample in a vacuum environment to a hydrogen filling temperature, performing continuous multi-step hydrogen filling, performing heat preservation to a stable hydrogen pressure at least after per step of hydrogen filling, and performing air cooling to a room temperature after the final-step hydrogen filling to complete the improvement of theroom-temperature plasticity of the TC4 titanium alloy. The process is simple and convenient in method, low in cost and obvious in plasticization effect; the room-temperature plasticity of the treatedTC4 titanium alloy is obviously improved; the room-temperature plasticity forming of a TC4 titanium alloy complex structure part is facilitated; and an application scope of the TC4 titanium alloy canbe expanded.

Description

technical field [0001] The invention belongs to the field of titanium alloy material processing, and in particular relates to a titanium alloy heat treatment process. Background technique [0002] At present, titanium alloys are widely used in aviation, aerospace and other fields due to a series of excellent properties such as high specific strength, good high temperature resistance, good corrosion resistance, and non-magnetic properties. TC4 titanium alloy is an α+β type titanium alloy with good comprehensive properties, and is the most widely used titanium alloy at home and abroad. However, TC4 titanium alloy has low plasticity and low deformation limit at room temperature, and it is easy to crack during cold forming, which limits its plastic forming at room temperature. At present, most titanium alloys need plastic forming at high temperature. Although titanium alloys have good plastic forming properties at high temperatures, high temperatures also bring a series of pro...

AI Technical Summary

Problems solved by technology

Although titanium alloys have good plastic forming properties at high temperatures, high temperatures also bring a series of problems to forming: high deformation temperature, large flow stress, difficult control of microstructure and properties, and high requirements for molds and forming equipment

However, for hydrogen-absorbing titanium alloy samples with large volume and mass, the vacuum packaging and solution quenching treatment are more difficult.