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Meeting MS&T23: Materials Science & Technology
Symposium Advances in Understanding of Martensite in Steels II
Presentation Title Investigation on Gigapascal Martensitic Microstructures for Higher Bendability of Advanced High-strength Hot Stamped Steel
Author(s) Byung-Gil Yoo, Jewoosoo Kim, Seok-Hyeon Kang, Seong Kyung Han, Tae Woo Kwon, Jae-il Jang
On-Site Speaker (Planned) Byung-Gil Yoo
Abstract Scope Newly commercialized the martensitic hot stamping (or press hardening) steels over 1.0GPa for automotive have been investigated to enhance high bendability (i.e. higher crashworthiness to protect cabin zone in car body). Recently, optimization of the chemical composition, heating process, and quenching temperature was performed to obtained higher mechanical properties in terms of higher micro-scale bendability under the martensitic unit microstructures. Nanoindentation hardness of individual phases in a localized zone of martensite and bainite was investigated in order to obtain a better understanding of how dislocation plasticity is influenced as a high bendability by crystalline defects. The results are discussed in terms of the influence on bendability of unit microstructure and the prevailing mechanism of size dependent plastic deformation.


Achieving 1.4 GPa Tensile Strength with Good Ductility in a Novel Low-alloy Low-carbon Martensite Steel
Effect of Thermomechanical Strategy and Ni-Mo Alloying on High Strength Quenched and Tempered Thick Plates
Evolution of Dislocation Structure during Plastic Deformation in Lath Martensite of Low-Carbon Steel Observed by ECCI
Excess Solute Carbon and Retained Tetragonality in Autotempered and Tempered Fe-C Lath Martensite
Geometrical Aspect of Variant-pairing of Martensite in Steel
In-situ Neutron Diffraction Analysis of Deformation-induced Transformation Behavior in High-strength and High-ductility Metastable Austenitic Stainless Steel Produced by Cold-rolling and Partitioning Method
Influence of Strain Rate on Mechanical Behavior and Microstructure Evolution of Fe-0.10C-5Mn Medium Manganese Steel
Investigation on Gigapascal Martensitic Microstructures for Higher Bendability of Advanced High-strength Hot Stamped Steel
Low Temperature Martensitic Transformations in Fe-Ni Alloys: Insight from Iron Meteorite Analyses
Phase Field Study of Tempering in Maraging Steels
Substructure and Crystallographic Features of As-quenched Lath Martensitic Steels
Substructure Boundary Sliding in Lath Martensite Quantitatively Investigated by Using Molecular Dynamics (MD) Simulation and Experiment

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