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A Modified Johnson-Cook Model for Ferritic-Pearlitic Steel in Dynamic Strain Aging Regime

1
R&D Turning, Sandvik Coromant AB, 811 81 Sandviken, Sweden
2
Department of Engineering Science, University West, SE-461 32 Trollhättan, Sweden
3
R&D, Sandvik Materials Technology AB, 811 81 Sandviken, Sweden
4
R&D, Sandvik Coromant AB, 811 81 Sandviken, Sweden
5
Department of Mechanical Engineering, Blekinge Institute of Technology, SE-371 41 Karlskrona, Sweden
*
Author to whom correspondence should be addressed.
Metals 2019, 9(5), 528; https://doi.org/10.3390/met9050528
Received: 29 March 2019 / Revised: 2 May 2019 / Accepted: 4 May 2019 / Published: 8 May 2019
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Abstract

In this study, the flow stress behavior of ferritic-pearlitic steel (C45E steel) is investigated through isothermal compression testing at different strain rates (1 s−1, 5 s−1, and 60 s−1) and temperatures ranging from 200 to 700 °C. The stress-strain curves obtained from experimental testing were post-processed to obtain true stress-true plastic strain curves. To fit the experimental data to well-known material models, Johnson-Cook (J-C) model was investigated and found to have a poor fit. Analysis of the flow stress as a function of temperature and strain rate showed that among other deformation mechanisms dynamic strain aging mechanism was active between the temperature range 200 and 400 °C for varying strain rates and J-C model is unable to capture this phenomenon. This lead to the need to modify the J-C model for the material under investigation. Therefore, the original J-C model parameters A, B and n are modified using the polynomial equation to capture its dependence on temperature and strain rate. The results show the ability of the modified J-C model to describe the flow behavior satisfactorily while dynamic strain aging was operative. View Full-Text
Keywords: flow stress; modified Johnson-Cook model; dynamic strain aging flow stress; modified Johnson-Cook model; dynamic strain aging
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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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Moris Devotta, A.; Sivaprasad, P.V.; Beno, T.; Eynian, M.; Hjertig, K.; Magnevall, M.; Lundblad, M. A Modified Johnson-Cook Model for Ferritic-Pearlitic Steel in Dynamic Strain Aging Regime. Metals 2019, 9, 528.

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