Hydrogen treatment roll compacting compound technology for improving additive manufacturing titanium alloy structure

Abstract

The invention provides a hydrogen treatment roll compacting compound technology for improving an additive manufacturing titanium alloy structure. The hydrogen treatment roll compacting compound technology for improving the additive manufacturing titanium alloy structure comprises the steps of during an additive manufacturing process, carrying out hydrogen treatment on titanium alloy powder, and roll compacting a printing piece layer by layer, so that the printing piece with structure being refined is prepared through a circulation process of printing-roll compacting-printing-roll compacting; and finally removing temporary alloying element hydrogen through vacuum annealing, so that the change of chemical components of a final material is avoided. During the process, the printing piece structure is refined and improved by utilizing hydrogen and the dislocation defects are increased by roll compacting at the same time, so that the capability of nucleation is reduced, the nucleation rate is improved, and the aims of refining grains and improving the structure without changing the alloy components are achieved.

Description

technical field [0001] The invention relates to the field of additive manufacturing, in particular to the improvement of titanium alloy structure, especially a hydrogenation + rolling process method for improving the additive manufacturing of titanium alloy structure. 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 supernormal 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 by...

AI Technical Summary

Problems solved by technology

But the same defect is that only using hydrogen in Ti 3 Subsequent heat treatment of Al alloys can refine grains, but hydrogen cannot be used to promote element diffusion and increase liquid / solid interface composition supercooling during cyclic melting and deposition; hydride formation and decomposition, hydrogen placement reduce deformation resistance and promote dislocation movement Then form deformation defects, promote non-spontaneous nucleation and refine 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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