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Meeting MS&T23: Materials Science & Technology
Symposium Advances in Understanding of Martensite in Steels II
Presentation Title Substructure and Crystallographic Features of As-quenched Lath Martensitic Steels
Author(s) Akinobu Shibata, Goro Miyamoto, Shigekazu Morito, Akiko Nakamura, Taku Moronaga, Houichi Kitano, Ivan Gutierrez-Urrutia, Toru Hara, Kaneaki Tsuzaki
On-Site Speaker (Planned) Akinobu Shibata
Abstract Scope The present study investigated the substructures and crystallographic features of as-quenched lath martensite (IF steel and 0.2C steel) using FIB-SEM serial sectioning and advanced transmission electron microscopy. A 3D analysis revealed that the morphology of the smallest structural unit exhibited a wedge-shaped plate instead of the ideal lath shape. The habit plane orientations were distributed from (5 7 5)A to (1 1 1)A in the IF steel, whereas they were near to that predicted based on the PTMC in the 0.2C steel. Moreover, the orientation changed significantly inside a given lath. The lath boundary consisted of regularly spaced steps with (0 1 1)M atomistic terrace planes, and the interfacial dislocations compensating for the misorientation between adjacent laths were observed on the lath boundaries. Additionally, carbon was segregated at the lath and block boundaries in the 0.2C steel. Our observation results indicated that the substructure changed significantly during quenching.


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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