|About this Abstract
||2022 TMS Annual Meeting & Exhibition
||High Performance Steels
||In-situ Investigation of Strain Partitioning and Localization in a Dual Phase Steel Up to and Beyond Necking
||Hyunseok Oh, Krista Biggs, Onur Güvenç, Hassan Ghassemi-Armaki, Narayan Pottore, Cemal Cem Tasan
|On-Site Speaker (Planned)
Strain partitioning and localization processes are triggered during the deformation of multi-phase metallic materials. However, microscopic digital image correlation is typically limited to low strain levels (< ~15%) due to surface topography evolution, which hinders the understanding of strain partitioning and localization processes at higher strain levels. Here, we address these challenges by developing a method that relies on serial in-situ scanning electron microscope mechanical tests of samples pre-strained to different levels. Applying this method to a dual-phase steel, we observe that ferrite and martensite on average exhibit a linear strain partitioning trend throughout the deformation even beyond necking. Strain localization bands with different microscopic strain paths develop in the microstructure, and the frequency of these bands differs at different stages of deformation. Martensitic constituents play an important role in the strain localization processes and the resulting microscopic strain paths.