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

R&D Turning, Sandvik Coromant AB, 811 81 Sandviken, Sweden
Department of Engineering Science, University West, SE-461 32 Trollhättan, Sweden
R&D, Sandvik Materials Technology AB, 811 81 Sandviken, Sweden
R&D, Sandvik Coromant AB, 811 81 Sandviken, Sweden
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;
Received: 29 March 2019 / Revised: 2 May 2019 / Accepted: 4 May 2019 / Published: 8 May 2019
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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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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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