Hydrogenation treatment method for improving additive manufacturing titanium alloy microscopic structure

Abstract

The invention belongs to the technical field of additive manufacturing, and provides a hydrogenation treatment method for improving an additive manufacturing titanium alloy microscopic structure. Titanium alloy powder is hydrogenated; during a printing process, the precipitation and the decomposition of hydride during a hydrogen melting and solidifying process promote the nucleation in a molten pool, and constitutional supercooling promotes the nucleation in multiple ways, so that grains of a printing structure are refined; temporary alloying element hydrogen is removed through vacuum annealing, so that the change of chemical components of a final material is avoided; and meanwhile, the structure of a printing piece is refined and improved by the hydrogen during the process, and the aim ofimproving the structure without changing the alloy components is achieved.

Description

technical field [0001] The invention relates to the field of additive manufacturing, in particular to the improvement treatment of titanium alloy structure, especially a hydrogenation treatment method for improving the microstructure of additive manufacturing titanium alloy. 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 forms of 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: the metal micro-region is rapidly heated under the action of a concentrated heat source, rapidly cooled and solidified, and then deposited layer b...

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Problems solved by technology

But the same defect is that it only uses hydrogen to refine the grains in the subsequent heat treatment process of TC4 alloy, but cannot use hydrogen to promote element diffusion and increase liquid / solid interface composition supercooling in the cyclic melting deposition process; hydride formation and decomposition, Hydrogen reduces deformation resistance and promotes dislocation movement to form deformation defects, promotes non-spontaneous nucleation and refines grains from multi-dimensional and multi-angle

[0009] 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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