The Effect of Long-Term Heating on Thermal Stability of Ultra-Fine Grained Titanium Alloy VT8M-1 Processed by Rotary Swaging

Abstract:

The paper focuses on the analysis of microstructure and mechanical properties of the Ti alloy VT8М-1 (Ti-5.3Al-4.0Mo-1.2Zr-1.3Sn-0.2Si) in an ultrafine-grained (UFG) state subjected to a long-term annealing at a service temperature of (≤ 450°С). A rotary swaging (RS) was used to process an UFG state in the material. The precipitation of disperse silicides of S2 was observed after the deformation by RS. It has been shown that the UFG alloy retained its high level of thermal stability and enhanced mechanical properties after long-term annealing up to 500 hours. The role of disperse silicides in both strengthening and stability of mechanical properties in the alloy after long-term annealing is discussed.

• Periodical: Materials Science Forum (Volume 1016)
• Pages: 1398-1403
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.1016.1398
• Online since: January 2021
• Authors: Andrey Stotskiy*, Tatyana Vitalyevna Yakovleva, Grigory Dyakonov, Alexander V. Polyakov, Irina P. Semenova
• Keywords: Long-Term Annealing, Mechanical Properties, Rotary Swaging, Silicide, Titanium Alloys, Ultrafine-Grained Structure

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