Process for improving titanium alloy wire additive manufacturing metallurgical structure

Abstract

The invention provides a process for improving a titanium alloy wire additive manufacturing metallurgical structure. The process comprises the following steps of carrying out hydrogenation treatment on a titanium alloy wire, namely introducing hydrogen in a certain percentage of the weight of the titanium alloy wire into a hydrogenation heat treatment furnace, keeping the temperature for a certain time, and cooling to room temperature to obtain a hydrogenation titanium alloy wire; carrying out high-temperature solid solution treatment on the titanium alloy wire subjected to hydrogenation; enabling the titanium alloy wire obtained after high-temperature solid solution treatment to be used for additive manufacturing, and obtaining a titanium alloy workpiece through printing of a wire feeding additive manufacturing process; and enabling the titanium alloy workpiece to be subjected to annealing and dehydrogenation treatment. According to the method, the front titanium alloy wire is subjected to hydrogenation treatment to obtain the hydrogenation titanium alloy wire, and the hydrogenation titanium alloy wire is subjected to solid solution treatment, so that shaping of the hydrogenation printing wire special for additive manufacturing is improved; and the titanium alloy wire obtained after solid solution is used for additive manufacturing to obtain the titanium alloy workpiece, and finally the manufactured titanium alloy workpiece is subjected to dehydrogenation heat treatment and annealing, so that the microscopic structure of the titanium alloy workpiece obtained through wire feeding additive manufacturing is refined and improved.

Description

technical field [0001] The invention relates to the technical field of additive manufacturing, in particular to the additive manufacturing technology of titanium alloys, in particular to a process for improving the metallurgical structure of titanium alloy wire additive manufacturing. Background technique [0002] The types of heat sources used in the additive manufacturing process include laser, electric arc, plasma, electron beam, etc., and in the ultra-metallurgical environment of rapid heating and rapid cooling in the additive manufacturing process, the metallurgical quality of additive manufacturing is poor and the structure is coarse. The materials involved include powder and wire, but no matter how the light source and product form change, the metallurgical characteristics of the solidification process are basically the same, that is, the metal micro-region is rapidly heated under the action of a concentrated heat source, rapidly cooled and rapidly solidified, and then...

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Problems solved by technology

However, its defect also lies in the fact that only hydrogen can be used to refine the grains in the subsequent heat treatment process of TC4 alloy, but hydrogen cannot be used to promote element diffusion and increase the supercooling of liquid / solid interface components in the process of cyclic melting and deposition; Hydrogen reduces deformation resistance and promotes dislocation movement to form deformation defects, promotes non-spontaneous nucleation from multi-dimensional and multi-angle, and refines grains

[0010] Although the above three methods can improve the structure of additive manufacturing to a certain extent, there are corresponding problems, and they cannot effectively improve the structure of additive manufacturing titanium alloy.

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