The role of nanoscale strain-induced defects in the sharp increase of low-temperature toughness in low-carbon and low-alloy steels
| Autor: | Viktor E. Panin, A. I. Gordienko, L.S. Derevyagina, Sergey V. Panin, Artur Shugurov |
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| Rok vydání: | 2019 |
| Předmět: |
010302 applied physics
Mesoscopic physics Toughness Materials science Mechanical Engineering Alloy Niobium chemistry.chemical_element 02 engineering and technology Crystal structure Manganese engineering.material Condensed Matter Physics Curvature 01 natural sciences 020303 mechanical engineering & transports 0203 mechanical engineering chemistry Mechanics of Materials 0103 physical sciences engineering General Materials Science Composite material Nanoscopic scale |
| Zdroj: | Materials Science and Engineering: A. 768:138491 |
| ISSN: | 0921-5093 |
| DOI: | 10.1016/j.msea.2019.138491 |
| Popis: | In the paper it is studied how the modes of thermal treatment of low-carbon steels alloyed with manganese (09G2S) and with manganese, vanadium, and niobium (10G2FBYu) affect their hierarchical structure and toughness in the low-temperature region from +20 down to −70 °C. A fine-grained structure, quasi-homogeneous lattice curvature, and nanoscale mesoscopic structural states arising due to radial-shear rolling at 850 °C are shown to be responsible for the formation of a nonequilibrium nanoscale bainitic structure, being a highly effective damping factor in a deformed material. The pearlitic steel structure is equilibrium and is formed within a translation-invariant crystal lattice, while the bainitic structure results from nanoscale mesoscopic structural states in interstices of lattice curvature zones. A spatial change in the lattice curvature is accompanied by a synchronous transformation of the nanoscale mesoscopic structural states and structural geometry of the bainitic phase. That is why the toughness of the steel with bainitic structure is very high down to the temperature −70 °C. Scratch testing is used to estimate the possibility of elastic recovery of bainitic phases in deformed steels. |
| Databáze: | OpenAIRE |
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