MATEC Web Conf.
Volume 321, 2020The 14th World Conference on Titanium (Ti 2019)
|Number of page(s)||5|
|Section||Microstructure - Properties Relationships|
|Published online||12 October 2020|
Thermal Stability of Titanium Alloy VT8M-1 with Ultrafine-Grained Structure
Institute of Physics of Advanced Materials, Ufa State Aviation Technical University, 450591, Ufa, Republic of Bashkortostan, Russian Federation
* Corresponding author: firstname.lastname@example.org
The paper considers the effect of a long-duration heating at a service temperature of 450oC on VT8M-1 with a coarse-grained (CG) and ultrafine-grained (UFG) microstructure. A duplex ultrafine-grained microstructure, composed of equiaxed grains of primary α-phase and an ultrafine constituent of α- and β-phases, was processed by thermal treatment and further rotary swaging. This type of a microstructure demonstrates a best combination of strength and ductility at room temperature in comparison with the CG structure. A thermal stability of an UFG state was studied at 450°C for 50, 100, 200, 300, 400, and 500 hours. The evolution of the alloy microstructure against the duration of heating was considered by transmission electronic microscopy (TEM), scanning electronic microscopy (SEM). No increase in the alloy structural elements and strength decrease resulting from a long-term annealing (up to 500 hours) at T=450°C have been observed. This proves a high thermal stability of the UFG structure and mechanical properties of VT8M-1 processed via rotary swaging.
Key words: Ti alloys / rotary swaging / ultrafine-grained structure / mechanical properties / long-term annealing / thermal stability
© The Authors, published by EDP Sciences, 2020
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