About this Abstract |
| Meeting |
2026 TMS Annual Meeting & Exhibition
|
| Symposium
|
Material Responses Investigated Through Novel In-Situ Experiments and Modeling
|
| Presentation Title |
G-25: Quantitative Characterization of Local Deformation in Steels Exhibiting Macroscopic Inhomogeneous Deformation Bands |
| Author(s) |
Takehiro Kobayashi, Myeong-heom Park, Sukyoung Hwang, Nobuhiro Tsuji |
| On-Site Speaker (Planned) |
Takehiro Kobayashi |
| Abstract Scope |
Low-carbon ferritic steels commonly exhibit inhomogeneous and locallized deformation after yielding, known as Lüders deformation. This behavior is attributed to the formation of Cottrell atmosphere, where carbon atoms segregate to dislocations and pin their motion, resulting in the formation and propagation of locallized deformation bands. Portevin–Le Chatelier (PLC) banding shown in high-Mn austenitic steels is another inhomogeneous deformation caused by strong interactions between mobile dislocations and carbon atoms. Although both phenomena involve interstitial-dislocation interactions, it remains unclear whether they originate from a common mechanism. To address this issue, the present study investigates macroscopic local deformation behavior in these steels, with a particular focus on local strain and stress evolution during deformation banding. In-situ X-ray diffraction (XRD) analysis revealed a temporary decrease in local stress coincided with propagation of both Lüders and PLC bands. Further discussions on the differences in local stress will be presented. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Mechanical Properties, Iron and Steel, Other |