Table of Contents
ISRN Mechanical Engineering
Volume 2013, Article ID 490750, 6 pages
Research Article

Plastic Constitutive Model and Analysis of Flow Stress of 40Cr Quenched and Tempered Steel

1School of Mechatronics Engineering, Henan University of Science and Technology, Luoyang 471003, China
2School of Mechanical and Precision Instrument Engineering, Xi An University of Technology, Xi An 710048, China

Received 6 June 2013; Accepted 10 July 2013

Academic Editors: A. Z. Sahin, A. Szekrenyes, and X. Yang

Copyright © 2013 Wang Xiao-qiang et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


To solve the problem of the accuracy of the numerical simulations of cold rolling, the thermomechanical responses of 40Cr under uniaxial compression loading are presented. The strain rates include quasistatic (0.004 s−1) at temperature of 293 K and dynamic loading regime (632 s−1~5160 s−1) at temperature regime (293 K~673 K). Significant strain rate and temperature sensitivity are measured. Based on these observations, the Johnson-Cook phenomenological constitutive model is proposed to predict the mechanical behavior of the 40Cr over wide ranges of strain rate and temperature. The solution process of the equation parameters is given. Correlations with this Johnson-Cook model are shown very close to the observed responses. Important material parameters are provided to the application of numerical analysis in project.