Abstract
The equal-channel angular extrusion (ECAE) of Ti-bearing interstitial-free (IF) steel was performed following two different routes, up to four passes, at a temperature of 300 °C. The ECAE led to a grain refinement to submicron size. After the second pass, the grain size attained saturation thereafter. The microstructural analysis indicated the presence of coincident-site lattice (CSL) boundaries in significant fraction, in addition to a high volume fraction of high-angle random boundaries and some low-angle boundaries after the deformation. Among the special boundaries, Σ3 and Σ13 were the most prominent ones and their fraction depended on the processing route followed. A deviation in the misorientation angle distribution from the Mackenzie distribution was noticed. The crystallographic texture after the first pass resembled that of simple shear, with the {112}, {110}, and {123} aligned to the macroscopic shear plane.
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Acknowledgments
The authors duly acknowledge Tata Steel (Jamshedpur, India) for providing the financial grant (Grant No. 3000024216/102) and the material to carry out the experiments. One of the authors (AB) gratefully acknowledges the prolific discussions with Prof. T. Watanabe (Retd. Professor, Tohuku University, Sendai, Japan) during the preparation of this article. Another author (SS) is thankful to Dr. N. Gope (Head, Research group, Tata Steel, Jamshedpur) for his encouragement at various stages of this project. The facility setup under the Institute Nanoscience Initiative sponsored by Department of Science and Technology through FIST (DST-FIST) program at the Indian Institute of Science (IISc) (Bangalore, India) was used in the present investigation.
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Manuscript submitted September 11, 2008.
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Bhowmik, A., Biswas, S., Suwas, S. et al. Evolution of Grain-Boundary Microstructure and Texture in Interstitial-Free Steel Processed by Equal-Channel Angular Extrusion. Metall Mater Trans A 40, 2729–2742 (2009). https://doi.org/10.1007/s11661-009-9939-5
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DOI: https://doi.org/10.1007/s11661-009-9939-5