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Meeting MS&T23: Materials Science & Technology
Symposium Advances in Understanding of Martensite in Steels II
Presentation Title Excess Solute Carbon and Retained Tetragonality in Autotempered and Tempered Fe-C Lath Martensite
Author(s) Naoki Maruyama, Shinichiro Tabata
On-Site Speaker (Planned) Naoki Maruyama
Abstract Scope The tetragonality and excess solute C in the matrix of autotempered low-to-medium C ferrous martensite with the M<sub>s</sub> well above room temperature have been revealed by XRD analysis and atom probe measurement. In order to elucidate the mechanism of the persistence of excess solute C in lath martensite, we investigated the changes in the crystal structure and solute C content in the matrix after quenching and tempering of 1Mn-C (C:0.07-0.8 mass%) steels, and the effect of Si addition. The amount of excess solute C was found to be uniquely correlated with retained tetragonality c/a irrespective of tempering conditions after martensitic transformation and C contents in the steels. The kinetics of the decrease in solute C in (auto-)tempering is presumably dominated by the kinetics of the lattice strain relaxation caused by C precipitation and dislocation migration in martensite matrix.


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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