Two-stage deformation of titanium alloy VT8M-1 with the formation of an ultrafine-grained structure in aviation parts
DOI:
https://doi.org/10.54708/26587572_2026_822558Keywords:
VT8M-1, UFG structure, rotary swaging, isothermal stamping, increased strengthAbstract
This article presents an analysis of the evolution of the microstructure, texture, and mechanical properties of the VT8M-1 heat-resistant titanium alloy during two-stage deformation. This allows for the formation and preservation of an ultrafine-grained (UFG) structure in the finished part. VT8M-1 is used to manufacture aircraft components. The initial deformation of the alloy was performed by rotary swaging at 750 ºC. Application of rotary swaging, as an industrial method, facilitates the formation of a long semi-finished product for further processing. Subsequent deformation to form the finished part was carried out by isothermal stamping at a decreased temperature compared to the standard mode. The first stage of deformation leads to refinement of the bimodal structure of the VT8M-1 alloy while preserving large primary α-grains and the formation of strong metallographic and crystallographic textures. In the second stage of deformation the alloy undergoes partial recrystallization, but the structure is retained in the UFG range. The metallographic texture becomes less sharp due to the change in the deformation scheme. The crystallographic texture also partially weakens, but shows a lattice rotation toward the compression axis during stamping, which facilitates deformation via basal slip systems. The analysis of the mechanical properties reveals that the application of rotary swaging and subsequent stamping enables the retention of enhanced strength characteristics compared to the coarse-grained state. The use of this method for the fabrication of components with enhanced mechanical properties is promising in the production of aircraft parts and constructions.References
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