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A modified Johnson-Cook model for ferritic-pearlitic steel in dynamic strain aging regime
University West, Department of Engineering Science, Research Enviroment Production Technology West. R&D Turning, Sandvik Coromant AB, Sandviken, 811 81, Sweden. (PTW)ORCID iD: 0000-0003-3877-9067
R&D, Sandvik Materials Technology AB, Sandviken, 811 81, Sweden.
University West, Department of Engineering Science, Division of Subtractive and Additive Manufacturing. (PTW)
University West, Department of Engineering Science, Division of Subtractive and Additive Manufacturing. (PTW)ORCID iD: 0000-0001-9331-7354
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2019 (English)In: Metals, ISSN 2075-4701, Vol. 9, no 5Article in journal (Refereed) Published
Abstract [en]

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.

Place, publisher, year, edition, pages
MDPI AG , 2019. Vol. 9, no 5
Keywords [en]
flow stress; modified Johnson-Cook model; dynamic strain aging
National Category
Manufacturing, Surface and Joining Technology
Research subject
ENGINEERING, Manufacturing and materials engineering
Identifiers
URN: urn:nbn:se:hv:diva-13989DOI: 10.3390/met9050528Scopus ID: 2-s2.0-85066741813OAI: oai:DiVA.org:hv-13989DiVA, id: diva2:1328119
Funder
Swedish Research Council, 20110263, 20140130Available from: 2019-06-20 Created: 2019-06-20 Last updated: 2019-07-25Bibliographically approved

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Devotta, Ashwin MorisBeno, TomasEynian, MahdiHurtig, Kjell

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Research Enviroment Production Technology WestDivision of Subtractive and Additive ManufacturingDivision of Welding Technology
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