Characterization of Stress and Strain Partitioning for Advanced High Strength Steels by in-situ HIgh Energy X-Ray Diffraction
- BATTELLE (PACIFIC NW LAB)
- Argonne National Laboratory
- University of Tennessee
Compared to other advanced high-strength steels, TRIP (Transformation-Induced Plasticity) steels exhibit better ductility at a given strength level and can be used to produce complicated automotive parts. This enhanced formability comes from the transformation of retained austenite to martensite during plastic deformation. In this study, as a first step in predicting optimum processing parameters in TRIP steel productions, a micromechanical finite element model is developed based on the actual microstructure of a TRIP 800 steel. The method uses microstructure-based representative volume element (RVE) to capture the complex deformation behavior of TRIP steels. The mechanical properties of the constituent phases of the TRIP 800 steel and the fitting parameters describing the martensite transformation kinetics are determined using the synchrotron-based in-situ high-energy X-ray diffraction (HEXRD) experiments performed under a uniaxial tensile deformation. The experimental results suggest that the HEXRD technique provides a powerful tool for characterizing the phase transformation behavior and the microstress developed due to the phase-to-phase interaction of TRIP steels during deformation. The computational results suggest that the response of the RVE well represents the overall macroscopic behavior of the TRIP 800 steel under deformation. The methodology described in this study may be extended for studying the effects of the various processing parameters on the macroscopic behaviors of TRIP steels.
- Research Organization:
- Pacific Northwest National Laboratory (PNNL), Richland, WA (United States)
- Sponsoring Organization:
- USDOE
- DOE Contract Number:
- AC05-76RL01830
- OSTI ID:
- 1499198
- Report Number(s):
- PNNL-SA-75663
- Journal Information:
- Ye jin fen xi = Metallurgical Analysis, Journal Name: Ye jin fen xi = Metallurgical Analysis
- Country of Publication:
- United States
- Language:
- English
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