Evolution of the Microstructure and Mechanical Properties of the Ultrafine-Grained VT8M-1 during Isothermal Die Forging and Thermal Treatment
| Autor: | Tatyana Vitalyevna Yakovleva, Irina P. Semenova, G.S. Dyakonov, Andrey Stotskiy, Askar Ibatullin |
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| Rok vydání: | 2021 |
| Předmět: |
010302 applied physics
Materials science Mechanical Engineering Metallurgy 02 engineering and technology Thermal treatment 021001 nanoscience & nanotechnology Condensed Matter Physics Microstructure 01 natural sciences Isothermal process Forging Mechanics of Materials 0103 physical sciences General Materials Science 0210 nano-technology |
| Zdroj: | Materials Science Forum. 1016:418-422 |
| ISSN: | 1662-9752 |
| DOI: | 10.4028/www.scientific.net/msf.1016.418 |
| Popis: | The work addresses the microstructural evolution and mechanical properties of the ultrafine-grained (UFG) VT8M-1 subjected to isothermal die forging (IDF) and subsequent thermal treatment. An UFG microstructure with a mean size of secondary grains of about 0.3 μm was processed by a rotary swaging (RS) at Т=780°С. The ultimate tensile strength (UTS) of the alloy increased by 23% as compared to an initial state due to the formation of an UFG microstructure. It has been shown that isothermal die forging of the UFG alloy at Т=780°С leads to the growth of secondary phase grains by 0.7 μm. Subsequent heat treatment of the forged billets leads to hardening of 11%, which can be attributed both to the formation of additional interphase α/β boundaries at the precipitation of a tertiary α-phase and silicide dispersion. |
| Databáze: | OpenAIRE |
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