Abstract
Significant crystallographic refinement was observed in the as-quenched lath martensitic steel during tensile deformation up to a strain of 20 pct. Crystallographic investigation by electron backscattering diffraction analysis coupled with the use of crystal plasticity model confirmed that the activation behavior of slip systems is inhomogeneous even within each martensite block. In particular, the activation behavior of slip systems is initially affected by the initial crystal orientation; however, the effect becomes negligible with increasing deformation. In addition, slip systems parallel to the lath plane are preferentially activated during elongation. Our results indicate that the nonuniform crystal rotation within individual blocks is induced not only by grain interaction phenomena but also by the anisotropic activity of slip systems. These are key factor that determines the grain refinement behavior in the as-quenched lath martensitic steel during deformation.
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The present research was conducted as part of an ISIJ Research Promotion Grant and the ALCA Project funded by the Iron and Steel Institute of Japan (ISIJ) and Japan Science and Technology Agency, respectively.
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Manuscript submitted August 21, 2013.
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Na, H., Nambu, S., Ojima, M. et al. Crystallographic and Microstructural Studies of Lath Martensitic Steel During Tensile Deformation. Metall Mater Trans A 45, 5029–5043 (2014). https://doi.org/10.1007/s11661-014-2461-4
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DOI: https://doi.org/10.1007/s11661-014-2461-4