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Crystal plasticity modeling of deformation and creep in polycrystalline Ti-6242

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Abstract

This paper develops an experimentally validated computational model based on crystal plasticity for the analysis of two-phase α/β Ti-6242 polycrystalline alloys. A rate-dependent elastic-crystal plasticity model is incorporated in this model to accommodate anisotropy in material behavior and tension-compression asymmetry inherent to this alloy. A combination of microtesting, orientation imaging microscopy, computational simulations, and minimization process, involving genetic algorithms, is implemented in this study for careful characterization and calibration of the material parameters. Size effects are considered in this analysis through a simple scaling process. A homogenized equivalent model of the primary α with transformed β colonies is developed for incorporation in the Ti-6242 FE model. The polycrystalline Ti-6242 computational model incorporates accurate phase volume fractions, as well as statistically equivalent orientation distributions to those observed in the orientation imaging microscopy scans. The effects of orientation, misorientations, and microtexture distributions are investigated through simulations by this computational model. The model is used to simulate constant strain rate and creep tests in compression and tension, and the results are compared with experiments. The effects of microstructure and creep-induced load-shedding on the localization of microstructural stresses and strains are studied for potential crack initiation criteria.

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Authors and Affiliations

  1. Department of Mechanical Engineering, The Ohio State University, Columbus, OH

    Dhyanjyoti Deka (Graduate Student), Deepu S. Joseph (Graduate Student) & Somnath Ghosh (Professor)

  2. Department of Materials Science and Engineering, The Ohio State University, Columbus, OH

    Michael J. Mills (Professor)

Authors
  1. Dhyanjyoti Deka
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  2. Deepu S. Joseph
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  3. Somnath Ghosh
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  4. Michael J. Mills
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Deka, D., Joseph, D.S., Ghosh, S. et al. Crystal plasticity modeling of deformation and creep in polycrystalline Ti-6242. Metall Mater Trans A 37, 1371–1388 (2006). https://doi.org/10.1007/s11661-006-0082-2

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  • DOI: https://doi.org/10.1007/s11661-006-0082-2

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