Periods of the stage of concentrated strain of specimens of low-carbon steel 08G2B with ultrafine structure are studied by joint analysis of stress–strain curves and fields of digital image correlation (DIC). The DIC data and detection of a through crack on the surface of a tensile specimen are used to justify the use of the parameters of the second period of the stage of concentrated strain as criteria of crack resistance. Experimental data are used to determine the main factors representing the influence of strain aging on the level of mechanical properties of the steel.
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The work has been performed at the Ural Federal University with financial support of Act No. 211 of the Government of the Russian Federation, Contract No. 02.A03.21.0006, at the Institute for Metals Physics of the Ural Branch of the Russian Academy of Sciences within State Assignment of the Ministry of Education and Science of Russia (Topic “Structure”, AAAA-A18-118020190112-8) and at the Institute of Mechanical Engineering of the Ural Branch of the Russian Academy of Sciences within State Assignment No. 0391-2016-0004. The tests have been conducted with the use of the equipment of the Collective Use Centers of the UFU and of the Institute of Mechanical Engineering.
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Translated from Metallovedenie i Termicheskaya Obrabotka Metallov, No. 7, pp. 46 – 50, July, 2020.
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Farber, V.M., Khotinov, V.A., Polukhina, O.N. et al. Effect of Strain Aging on Stages of Plastic Strain and Tensile Fracture of Specimens of Steel 08G2B. Part II. Stage of Concentrated Strain. Met Sci Heat Treat 62, 464–468 (2020). https://doi.org/10.1007/s11041-020-00585-2
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DOI: https://doi.org/10.1007/s11041-020-00585-2