Abstract
The micromechanical properties of the constituent phases were characterized for advanced high-strength steels (AHSS) produced by a quenching and partitioning (Q&P) process with in situ tensile loading under synchrotron-based, high-energy X-ray diffraction. The constituent phases present are retained austenite and three martensites (tempered, untampered, and freshly formed martensites). For the material investigated, the 200 and 220 lattice strains of the retained austenite phase were calculated by examining the changes of the X-ray diffraction peak positions during deformation. The 200 and 211 lattice strains of the various martensitic phases with similar crystal structures were determined by separating their overlapped diffraction peaks. Apart from tempered and untempered martensite, the diffraction peaks of freshly formed martensite as a result of austenite-to-martensite transformation can also be separated due to a high initial austenite volume fraction. The phase stresses are first estimated with an empirical relationship through the X-ray diffraction elastic constants. A multiphase elasto-plastic self-consistent model is next used for more accurate determination of the constitutive behaviors of the various phases by comparing the predicted lattice strain distributions and global stress–strain curves with the measured ones. The determined constitutive laws will be used for microstructure-based modeling for sheet formability of the Q&P AHSS steel.
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Acknowledgment
The Pacific Northwest National Laboratory is operated by the Battelle Memorial Institute for the U.S. Department of Energy under Contract no. DE-AC06-76RL01830. This work was funded by the Department of Energy Office of FreedomCar and Vehicle Technologies under the Automotive Lightweighting Materials Program managed by Mr. William Joost. This research used resources from the Advanced Photon Source, a U.S. Department of Energy (DOE) Office of Science User Facility operated for the DOE Office of Science by Argonne National Laboratory under Contract No. DE-AC02-06CH11357.
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X.H. Hu, K.S. Choi, and X. Sun are employed by Pacific Northwest National Laboratory. Y. Ren is employed by Argonne National Laboratory. U.S. Government work is not protected by U.S. Copyright.
Manuscript Submitted October 29, 2014.
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Hu, X., Choi, K.S., Sun, X. et al. Determining Individual Phase Flow Properties in a Quench and Partitioning Steel with In Situ High-Energy X-Ray Diffraction and Multiphase Elasto-Plastic Self-Consistent Method. Metall Mater Trans A 47, 5733–5749 (2016). https://doi.org/10.1007/s11661-016-3373-2
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DOI: https://doi.org/10.1007/s11661-016-3373-2