Specimens of armco iron and steels 09GS and 37G2S possessing strongly different load-extension diagrams are studied. The σ = f (δ) curves are divided into regularly alternating periods, i.e., linear, power within the uniform stage, and I, II, III in the lumped stage. Each period is characterized by the yielding parameter (YP), plasticity components (elongation δi), initial stress σi, and rate of growth/decrease of the stress (∆σ/δ∆)i. Analysis of the YP is used to compare the periods in differently hardened specimens. It is shown that the combination of these periods is responsible for the standard mechanical properties of the specimens. The values of the YP are used to trace the relation between the ductility and the crack resistance and to show that the stress σII and the elongation \( {\updelta}_{\mathrm{l}}^{\mathrm{IIs}} \) at the start of period II of the concentrated stage may be treated as criteria of crack resistance.
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M. I. Goldshtein, V. S. Litvinov, and B. M. Bronfin, The Physical Metallurgy of High-Strength Alloys [in Russian], Metallurgiya, Moscow (1986), 312 p.
L. I. Tushinskii, The Structural Theory of the Structural Strength of Materials [in Russian], NGTU, Novosibirsk (2004), 399 p.
I. Yu. Pyshmintsev, D. A. Pumpyanskii, and V. M. Farber, “Ductility of steels and its characteristics,” Metalloved. Term. Obrab. Met., No. 11, 20 – 27 (2011).
P. D. Odesskii and V. D. Kulik, Steels with High Resistance to Extreme Impacts [in Russian], Intermet Engineering, Moscow (2008), 239 p.
V. M. Farber, I. Yu. Pyshmintsev, A. B. Arabey, et al., “Contribution of different structural factors into formation of strength properties of steels of strength class K65,” Izv. Vysh. Uchebn. Zaved., Chern. Metall., No. 9, 46 – 49 (2012).
R.W. Hertzberg, Deformation and Fracture Mechanics of Engineering Materials, John Wiley & Sons Inc. (1996), 810 p.
M. A. Shtremel, Strength of Alloys, Pt. 2, Deformation [in Russian], MISiS, Moscow (1999), 394 p.
V. M. Farber, O. N. Polukhina, D. I. Vichuzhanin, et al., “Investigation of plastic strain in front of and on the yield plateau of steel 08G2B. Part 1. Formation of plastic and elastic strain waves,” Metalloved. Term. Obrab. Met., No. 5, 9 – 14 (2019).
L. B. Zuev, V. I. Danilov, and S. A. Barannikova, The Physics of Macrolocalization of Plastic Flow [in Russian], Nauka, Novosibirsk (2008), 327 p.
V. M. Farber, V. A. Khotinov, O. N. Polukhina, et al., “Effect of strain aging in the stage of plastic deformation and fracture due to tension of specimens of steel 08G2B. Part I. Yield plateau and stage of strain hardening,” Metalloved. Term. Obrab. Met., No. 7, 1 – 8 (2020).
V. M. Farber, V. A. Khotinov, O. N. Polukhina, et al., “Effect of strain aging in the stage of plastic deformation and fracture due to tension of specimens of steel 08G2B. Part II. Lumped stage,” Metalloved. Term. Obrab. Met., No. 7, 9 – 16 (2020).
V. M. Farber and O. V. Selivanova, “Classification of relaxation processes and their manifestation under plastic deformation of metals,” Izv. Ross. Akad. Nauk, No. 1, 110 – 114 (2001).
M. A. Shremel, Fracture, Pt. 1, Fracture of Material [in Russian], MISiS, Moscow (2014), 670 p.
V. D. Sadovskii, Structural Inheritance of Steel [in Russian], Metallurgiya, Moscow (1973), 208 p.
V. M. Farber, V. A. Khotinov, O. V. Selivanova, and O. N. Polukhina, “Structure and strain aging of high-strength low-alloy steel,” Proizvod. Prokata, No. 11, 42 – 48 (2017).
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Translated from Metallovedenie i Termicheskaya Obrabotka Metallov, No. 4, pp. 14 – 20, April, 2021.
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Farber, V.M., Khotinov, V.A. Characteristics of Stages (Periods) of Load-Extension Curve of Structural Steels. Met Sci Heat Treat 63, 183–189 (2021). https://doi.org/10.1007/s11041-021-00668-8
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DOI: https://doi.org/10.1007/s11041-021-00668-8