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

Moris Devotta, Ashwin; Sivaprasad, P. V.; Beno, Tomas; Eynian, Mahdi; Hjertig, Kjell; Magnevall, Martin; Lundblad, Mikael

doi:10.3390/met9050528

Open AccessArticle

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

by

Ashwin Moris Devotta

^1,2,*,

P. V. Sivaprasad

³,

Tomas Beno

²,

Mahdi Eynian

²

,

Kjell Hjertig

²

,

Martin Magnevall

^4,5 and

Mikael Lundblad

⁴

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

Submission 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.

Keywords: flow stress; modified Johnson-Cook model; dynamic strain aging

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MDPI and ACS Style

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. https://doi.org/10.3390/met9050528

AMA Style

Moris Devotta A, Sivaprasad PV, 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(5):528. https://doi.org/10.3390/met9050528

Chicago/Turabian Style

Moris Devotta, Ashwin, P. V. Sivaprasad, Tomas Beno, Mahdi Eynian, Kjell Hjertig, Martin Magnevall, and Mikael Lundblad. 2019. "A Modified Johnson-Cook Model for Ferritic-Pearlitic Steel in Dynamic Strain Aging Regime" Metals 9, no. 5: 528. https://doi.org/10.3390/met9050528

APA Style

Moris Devotta, A., Sivaprasad, P. V., Beno, T., Eynian, M., Hjertig, K., Magnevall, M., & Lundblad, M. (2019). A Modified Johnson-Cook Model for Ferritic-Pearlitic Steel in Dynamic Strain Aging Regime. Metals, 9(5), 528. https://doi.org/10.3390/met9050528

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

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