Journal
ACTA MATERIALIA
Volume 132, Issue -, Pages 230-244Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.actamat.2017.04.028
Keywords
Quench and partitioning steels; CRSS and hardening parameters; Synchrotron radiation; X-ray diffraction; Elastic plastic self-consistent model; Crystal plasticity finite element model
Funding
- Department of Energy National Energy Technology Laboratory [DE-EE0005976]
- agency of the United States Government
- U.S. Department of Energy [DE-AC06-76RL01830]
- DOE Office of Science by Argonne National Laboratory [DE-AC02-06CH11357]
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Microstructure-based constitutive models for multiphase steels require accurate constitutive properties of the individual phases for component forming and performance simulations. We address this requirement with a combined experimental/theoretical methodology which determines the critical resolved shear stresses and hardening parameters of the constituent phases in QP980, a TRIP assisted steel subject to a two-step quenching and partitioning heat treatment. High energy X-Ray diffraction (HEXRD) from a synchrotron source provided the average lattice strains of the ferrite, martensite, and austenite phases from the measured volume during in situ tensile deformation. The HEXRD data was then input to a computationally efficient, elastic-plastic self-consistent (EPSC) crystal plasticity model which estimated the constitutive parameters of different slip systems for the three phases via a trial-and error approach. The EPSC-estimated parameters are then input to a finite element crystal plasticity (CPFE) model representing the QP980 tensile sample. The predicted lattice strains and global stress versus strain curves are found to be 8% lower that the EPSC model predicted values and from the HEXRD measurements, respectively. This discrepancy, which is attributed to the stiff secant assumption in the EPSC formulation, is resolved with a second step in which CPFE is used to iteratively refine the EPSC-estimated parameters. Remarkably close agreement is obtained between the theoretically-predicted and experimentally derived flow curve for the QP980 material. (C) 2017 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
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