A modified johnson-cook model for ferritic-pearlitic steel in dynamic strain aging regime

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. © 2019 by the authors. Licensee MDPI, Basel, Switzerland.

Keywords

Dynamic strain aging, Flow stress, Modified johnson-cook model

Citation

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 20199, 528. DOI:

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http://urn.kb.se/resolve?urn=urn:nbn:se:bth-18160

https://doi.org/10.3390/met9050528

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