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Meeting 2026 TMS Annual Meeting & Exhibition
Symposium Advanced Characterization Techniques for Quantifying and Modeling Deformation
Presentation Title Dynamics of Portevin-Le Chatelier Banding Revealed Through Grain Refinement in High-Mn Austenitic Steel: Sequential Overcoming of Necking
Author(s) Sukyoung Hwang, Myeong-heom Park, Toshiyuki Fujii, Nobuhiro Tsuji
On-Site Speaker (Planned) Sukyoung Hwang
Abstract Scope The dynamics of Portevin–Le Chatelier (PLC) banding were thoroughly investigated through grain refinement in high-Mn austenitic steel. Serrations were observed on all stress–strain curves of various grain-sized specimens ranging from 8.4 μm (CG) to 0.82 μm (UFG), while those in the UFG specimen were notably weak in early stages. Digital image correlation (DIC) revealed that serration behavior corresponded perfectly to localized deformation characterized by the formation, propagation, and annihilation of PLC bands (PLC banding). Grain refinement reduced deformation within PLC bands and enhanced it outside, leading to more homogeneous deformation. In-situ synchrotron XRD combined with DIC enabled the first evaluation of local strain hardening during tensile testing. Necking was periodically overcome by high local strain hardening within PLC bands, achieved by dislocation multiplication and stacking fault formation. The UFG specimen exhibited greater local strain hardening, which contributed to more uniform deformation and weaker serrations.
Proceedings Inclusion? Planned:
Keywords Characterization, Iron and Steel, Mechanical Properties

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