Nano Research & Applications

The single phase constitutive relation of dual phase steel based on nanoindentation test and finite element modeling

17^th Edition of International Conference on Emerging Trends in Materials Science and Nanotechnology
April 26-27, 2018 Rome, Italy

HAO Lei-lei, GUO Cheng-yu, KANG Yong-lin, LI Sheng-ci, and He Bai-zhi

University of Science and Technology Beijing, China Jiangxi University of Science and Technology, China

Posters & Accepted Abstracts: Nano Res Appl

DOI: 10.21767/2471-9838-C1-009

Abstract

Dual phase steel is widely used in manufacturing for its excellent combination of strength with plasticity. Previously, much attention has been paid in the strengthening mechanism of dual phase steel and a great deal of papers have been published while the plastic deformation mechanism has not been further discussed. In this paper, combining the nanoindentation test with finite element modeling the single phase constitutive equations of dual phase steel was established. To solve the P-h curve, reverse analysis algorithms and five dimensionless function are adopted. In addition, the nanoindentation is simulated by ABAQUS to validate the accuracy of numerical calculation. A representative stress and corresponding representative strain are solved by dimensionless functions and updated with finite element modeling. Forty nanoindentation sites are tested and simulated to investigate the impact of friction and tip shape of indenter in modeling. Finally, we will give a complete method of solving constitutive relation from nanoindentation and provide a theoretical basis for the further study of dual phase steel��?s plastic behavior. The constitutive relation of ferrite and martensite are completed, which reveals the average yield stress and strain hardening index of martensite and ferrite are 830.06MPa, 0.182, 360.34MPa, 0.226 respectively. For complete martensite steel, the yield stress and strain hardening index are 1352.85MPa and 0.130. The uniaxial tensile results are 416.81MPa and 0.2. haoleiwork@gmail.com