Abstract
The effect of two varying strain levels (3 and 5%) produced by cold rolling and two solution-annealing heat treatment temperatures (1173 and 1273 K) on the evolution of low-energy configured coincident site lattice (CSL) boundaries in a 22-mm-thick 316LN stainless steel plate was investigated. A simple single-step strain-annealing approach was adopted to maximize the CSL boundaries and to obtain grain boundary-engineered (GBE) microstructure. The low-Σ CSL boundaries up to Σ ≤ 29b were quantified according to Brandon criteria for all the GBE-processed conditions and compared with the as-received condition. It was observed that the fraction of Σ3 and Σ9 boundaries saturated beyond deviation of 2° from their ideal misorientation based on Brandon criteria for most of the GBE-processed conditions. The prevalence of prolific twinning which usually occurs at triple boundary junctions was studied by mapping the nature of triple boundary junction (TBJ) segments and by estimating the relative distribution of Σ3, Σ9 and Σ27 boundaries. The extent of strain-induced boundary migration (SIBM) mechanism which is a prerequisite phenomenon for prolific twinning was assessed using electron backscatter diffraction (EBSD)-based kernel average misorientation (KAM) and grain average misorientation (GAM) mapping. The interdependence between KAM and GAM parameters with respect to the evolution of CSL boundaries was evaluated. The corrosion properties have been evaluated by estimating the degree of sensitization (% DOS) in all the GBE microstructures.
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The data that support the findings of this study are available from the corresponding author upon reasonable request.
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Acknowledgments
The authors thank Dr. B. Venkatraman, Director, Indira Gandhi Centre for Atomic Research (IGCAR); Dr. R. Divakar, Director, Metallurgy & Materials Group (MMG) and Materials Science Group (MSG); and Dr. M. Vasudevan, Associate Director, Materials Development & Technology Group (MDTG) for their unconditional support and encouragement. The authors would like to thank Dr. Poonguzhali for the help rendered during carrying out corrosion studies. Special thanks to Dr. Diptimayee Samantaray, Head, High-temperature Materials Technology Section (HMTS), for providing the cold rolling facility and Shri. A. Arasu, High-temperature Materials Technology Section (HMTS) for his valuable help during the rolling operation. Also, we thank our collaborator Dr. Ramakrishna Pagoti, SRI, AERB, Kalpakkam, for his help rendered during analysis of EBSD data in MATLAB®.
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DPRP involved in conceptual, experimental, investigation, formal analysis and writing the original draft manuscript. VDV involved in conceptual, supervision, validation, review and editing the draft manuscript. KM involved in formal characterization and review. VG involved in analysis and review. GVPR involved in project resources, review and editing. AN involved in project administration, review and editing.
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Palaparti, D.P.R., Vijayanand, V.D., Mariappan, K. et al. Interdependency between Electron Backscatter Diffraction-Based Misorientation Parameters and Coincidence Site Lattice Boundaries in 316LN Stainless steel. J. of Materi Eng and Perform (2023). https://doi.org/10.1007/s11665-023-08862-w
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DOI: https://doi.org/10.1007/s11665-023-08862-w