|About this Abstract
||2023 TMS Annual Meeting & Exhibition
||High Performance Steels
||Phase Boundary Segregation Induced Strengthening in Ultrafine-grained Duplex Medium-Mn Steels
||Yan Ma, Binhan Sun, Alexander Schökel, Wenwen Song, Dirk Ponge , Dierk R. Raabe, Wolfgang Bleck
|On-Site Speaker (Planned)
Hetero-interfaces affect the materials in various aspects such as dislocation activity and damage formation. However, it remains a question whether the characteristics of phase boundaries would also have an impact on the mechanical behavior in multiphase steels. Here we reveal a phase boundary segregation-induced strengthening effect in ultrafine-grained duplex medium-Mn steels. We found that the carbon segregation at ferrite-austenite phase boundaries resulted in a yield strength enhancement by 100–120 MPa and simultaneously promoted discontinuous yielding. The sharp carbon segregation at the phase boundaries impeded interfacial dislocation emission, thus increasing the stress required to activate such dislocation nucleation process and initiate plastic deformation. These findings extend the current understanding of the yielding behavior in medium-Mn steels, and more importantly, shed light on utilizing and manipulating phase boundary segregation to improve the mechanical performance of multiphase metallic materials.
||Iron and Steel, Mechanical Properties,