Gr23 titanium alloy wire for powder production is prepared by heating Gr23 alloy wire with uniform transverse and longitudinal structure below the phase change point by tube heating furnace, and drawing the wire blank with oxidized surface is obtained. The silk billet was cold-drawn with roll die for several times, and pickled with acid solution to obtain the silk billet without oxide skin and surface contamination layer. The billet was annealed in the middle vacuum to obtain a cold tandem rolling billet with good cold working performance. The special-shaped wire was obtained by cold continuous rolling with a 12-square pass roll, and the special-shaped wire was drawn into a round wire by cold-drawing with a double roll die. The Gr23 alloy wire with bright surface was obtained by vacuum heat treatment. The Gr23 alloy wire prepared by the method of the invention has no surface oxide and surface contamination layer residue, uniform and fine transverse and longitudinal microstructure, equiaxial microstructure, low H content, and meets the raw material requirements for preparing high-quality spherical powder by plasma atomization method.
Technology. At present, the main preparation methods of titanium and titanium alloy spherical powder for additive manufacturing are inert gas atomization, plasma atomization, electrode induction melting gas atomization, plasma rotating electrode method, etc.
Titanium alloy wire was used to prepare titanium alloy spherical powder by plasma atomization. The main reason for the difficulty in preparing high purity titanium alloy spherical powder is that it is difficult to prepare high quality titanium alloy wire, and it is easy to introduce impurity elements or pollutants in the process of titanium alloy ingot melting and wire processing. With the development of titanium alloy spherical powder preparation technology, high quality titanium alloy wire has become the key raw material restricting the preparation of high purity titanium alloy spherical powder. Titanium alloy wire suitable for preparing high purity titanium alloy spherical powder should have the characteristics of high purity, low oxygen content and no impurity pollution.
Gr23 alloy is a medium strength two-phase titanium alloy, the alloy has excellent comprehensive properties, especially good process plasticity, suitable for a variety of pressure processing forming, can be prepared into wire, sheet, bar, sheet, profile, widely used in additive manufacturing, biomedical, aerospace and other fields. Gr23 alloy has very active chemical properties, easy to combine with oxygen, nitrogen and other molecules, so it is easy to be polluted in the melting process and wire processing.
