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Title: Predicting Ductility and Failure Modes of TRIP Steels under Different Loading Conditions

We study the ultimate ductility and failure modes of a TRIP (TRansformation-Induced Plasticity) 800 steel under different loading conditions with an advanced micromechanics-based finite element analysis. The representative volume element (RVE) for the TRIP800 under examination is developed based on an actual microstructure obtained from scanning electron microscopy (SEM). The evolution of retained austenite during deformation process and the mechanical properties of the constituent phases of the TRIP800 steel are obtained from the synchrotron-based in-situ high-energy X-ray diffraction (HEXRD) experiments and a self-consistent (SC) model. The ductile failure of the TRIP800 under different loading conditions is predicted in the form of plastic strain localization without any prescribed failure criteria for the individual phases. Comparisons of the computational results with experimental measurements suggest that the microstructure-based finite element analysis can well capture the overall macroscopic behavior of the TRIP800 steel under different loading conditions. The methodology described in this study may be extended for studying the ultimate ductile failure mechanisms of TRIP steels as well as the effects of the various processing parameters on the macroscopic behaviors of TRIP steels.
Authors:
; ; ;
Publication Date:
OSTI Identifier:
1000797
Report Number(s):
PNNL-SA-70428
VT0505000; TRN: US201101%%553
DOE Contract Number:
AC05-76RL01830
Resource Type:
Conference
Resource Relation:
Conference: Proceedings of the 10th International Conference on Numerical Methods in Industrial Forming Processes (NUMIFORM 2010): AIP Conference Proceedings, 1252(2):1265-1270
Publisher:
F Barlat, YH Moon and MG Lee; American Institute of Physics, New York, United States(US).
Research Org:
Pacific Northwest National Laboratory (PNNL), Richland, WA (US)
Sponsoring Org:
USDOE
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; AUSTENITE; DEFORMATION; DUCTILITY; MECHANICAL PROPERTIES; MICROSTRUCTURE; PLASTICITY; PLASTICS; PROCESSING; SCANNING ELECTRON MICROSCOPY; STEELS; STRAINS; X-RAY DIFFRACTION TRIP steel; ductility; failure criteria; retained austenite; phase transformation