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Meeting MS&T23: Materials Science & Technology
Symposium Advances in Understanding of Martensite in Steels II
Presentation Title Evolution of Dislocation Structure during Plastic Deformation in Lath Martensite of Low-Carbon Steel Observed by ECCI
Author(s) Shuang Gong, Junya Inoue
On-Site Speaker (Planned) Shuang Gong
Abstract Scope It is known that lath martensite, despite its high yield strength, shows a very weak ductility. It was clarified that lath martensite exhibits significant anisotropy in local deformation behavior and that lath martensite is a composite of two kinds of grains with soft orientation (SO) and hard orientation (HO), depending on the active slip system, in-lath and out-of-lath slip system. To understand the microscopic mechanism of plastic deformation in lath martensite, the in-situ ECCI technique was conducted to investigate the microscopic dislocation movement in HO and SO. As results, at the early stage of the plastic deformation, dislocation density seems to drastically increase in HO, while slightly decreased in SO by the formation of cell structure. The edge component of the dislocations with the largest Schmid factor started moving first. In HO, this movement would form a high-density parallel screw dislocation array, while in SO, it induced cell structure formation.


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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