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Metals 2017, 7(7), 280; doi:10.3390/met7070280

Effect of Structural Heterogeneity of 17Mn1Si Steel on the Temperature Dependence of Impact Deformation and Fracture

1
Institute of Strength Physics and Materials Science of Siberian Branch of Russian Academy of Sciences, Tomsk 634055, Russia
2
Department of Idustrial Automation, Ternopil Ivan Pul’uj National Technical University, Ternopil 46001, Ukraine
3
Department of Material Science in Mechanical Engineering, Institute of High Technology Physics, National Research Tomsk Polytechnic University, Tomsk 634050, Russia
4
Department of Mechanical and Industrial Engineering, Norwegian University of Science and Technology, 7491 Trondheim, Norway
5
Institute for Materials Testing, Materials Science and Strength of Materials, University of Stuttgart, 70569 Stuttgart, Germany
*
Author to whom correspondence should be addressed.
Received: 7 June 2017 / Revised: 12 July 2017 / Accepted: 14 July 2017 / Published: 22 July 2017
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Abstract

The paper deals with a theoretical and experimental study of the relationship between the microstructural parameters, mechanical properties, and impact deformation and fracture of steels using the example of 17Mn1Si pipe steel. A model for the behavior of a polycrystalline grain conglomerate under impact loading at different temperatures was proposed within a cellular automata framework. It was shown that the intensity of dissipation processes explicitly depends on temperature and these processes play an important role in stress relaxation at the boundaries of structural elements. The Experimental study reveals the relationship between pendulum impact test temperature and the deformation/fracture energy of the steel. The impact toughness was shown to decrease almost linearly with the decreasing test temperature, which agrees with the fractographic analysis data confirming the increase in the fraction of brittle fracture in this case. It was shown with the aid of the proposed model and numerical simulations that the use of the excitable cellular automata method and an explicit account of test temperature through the possibility of energy release at internal interfaces help to explain the experimentally observed features of impact failure at different temperatures. View Full-Text
Keywords: impact loading; pipe steel; excitable cellular automata; polycrystalline grain conglomerate; stress relaxation; fractographic analysis; energy release; interfaces; cold embrittlement impact loading; pipe steel; excitable cellular automata; polycrystalline grain conglomerate; stress relaxation; fractographic analysis; energy release; interfaces; cold embrittlement
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Moiseenko, D.; Maruschak, P.; Panin, S.; Maksimov, P.; Vlasov, I.; Berto, F.; Schmauder, S.; Vinogradov, A. Effect of Structural Heterogeneity of 17Mn1Si Steel on the Temperature Dependence of Impact Deformation and Fracture. Metals 2017, 7, 280.

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