A Modified Johnson-Cook Model Incorporating the Effect of Grain Size on Flow Stress

Abstract

The mechanical properties of steel are influenced by grain size, which can change through mechanisms such as nucleation and growth at elevated temperatures. However, the classic Johnson-Cook model that is widely used in hot deformation simulations does not consider the effect of grain size on flow stress. In this study, the Johnson-Cook model was modified to incorporate the effects of austenite grain size on flow stress. A finite element model was employed to characterize the effects of grain size on the flow stress for different steel grades over a range of temperatures (900⁰ to 1300⁰). Simulation results show good agreement with experimental observations.

Department(s)

Materials Science and Engineering

Second Department

Mechanical and Aerospace Engineering

Research Center/Lab(s)

Peaslee Steel Manufacturing Research Center

Second Research Center/Lab

Center for High Performance Computing Research

Comments

This work was supported by the Peaslee Steel Manufacturing Research Center (PSMRC) at Missouri University of Science and Technology.

This article is available for download in Scholars' Mine.

Keywords and Phrases

Johnson-Cook Model; Thermo-mechanical characterization; Prior-austenitic grain size; Finite-Element model

Document Type

Article - Journal

Document Version

Citation

File Type

text

Language(s)

English

Rights

© 2021 Association for Iron & Steel Technology (AIST), All rights reserved.

Publication Date

Oct 2021

Link to Full Text

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