Abstract
Multilayered composite steels consisting of alternating layers of martensitic phase and austenitic phase exhibit an excellent combination of strength and elongation compared with conventional advanced high-strength steels. The deformation processes underlying these properties are of considerable interest. In this article, microstructure, grain size, and phase are characterized by scanning electron microscopy (SEM) and electron backscattering diffraction. The hardness of each layer is analyzed by a microindentation hardness testing system. Finally, the deformation and failure processes in multilayered steel are investigated by in-situ SEM. The hardness results indicate that various hardening modes occur in the soft austenitic layer and the hard martensitic layer. In-situ SEM results combined with microstructure analysis and hardness results reveal that annealing temperature and annealing time have a significant impact on final microstructure, fracture behavior, strength, hardness, and ductility.
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Acknowledgments
The EBSD was supported by ORNL’s Shared Research Equipment (ShaRE) User Program, which is sponsored by the Office of Basic Energy Sciences, the United States Department of Energy. The authors express their appreciation to Drs. W. Tang and J. Chen for their help with the experiments and English editing. The authors also thank the editors and reviewers for their comments and suggestions.
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Manuscript submitted November 2, 2015.
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Cao, R., Yu, X., Feng, Z. et al. Effect of Annealing Temperature and Time on Microstructure and Mechanical Properties of Multilayered Steel Composite Sheets. Metall Mater Trans A 47, 6042–6055 (2016). https://doi.org/10.1007/s11661-016-3747-5
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DOI: https://doi.org/10.1007/s11661-016-3747-5