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Meeting Materials Science & Technology 2019
Symposium Advances in Understanding of Martensite in Steels
Presentation Title Use of In-situ Methods to Investigate the Deformation Induced Martensitic Transformation
Author(s) Djamel Kaoumi, Francois-Ligori Paul, Yuchen Zhao, Matthew Frost, Jun-Sang Park, Jonathan Almer
On-Site Speaker (Planned) Djamel Kaoumi
Abstract Scope Deformation Induced Martensitic (DIM) transformation in various 304 Stainless Steels is characterized in-situ through imaging and diffraction methods. (i) In-situ TEM tensile experiments done at 25C down to cryogenic temperatures (-100C) evidenced processes of Stacking Fault (SF) formation and the transformations from austenite γ (fcc) to both ε-martensite (hcp) and/or α’-martensite (bct). (ii) The DIM transformation was also investigated in-situ through uniaxial tensile tests performed at 25C under synchrotron X-ray diffraction and neutron diffraction measurements respectively where the estimated phase volume fraction and the internal stress analysis based on the diffraction data evidenced a possible mechanism of direct transformation to α’-martensite by crystal lattice deformation. This presentation will thus showcase how in-situ techniques are suitable to investigate phase transformation mechanisms induced under stress.
Proceedings Inclusion? Definite: At-meeting proceedings


Comparison of Transformation Potential Calculations for Two Martensitic Transformation Paths
Effect of Boron on Segregation Behavior on M-A Formation during Continuous Cooling
Effect of Tensile Stress on the Kinetics of Isothermal Martensitic Transformation
Flying Martensite: Transformations in Materials Design
Influence of Quenching Rate on Microstructure in High Carbon Steels
Martensite and Manufacturing- Alloy Development to Minimize Residual Stress in Large Ferrous Additive Manufactured Parts
Martensite Formation in the Intercritically Reheated Coarse Grained Heat Affected Zone of Line Pipe Steels
Microstructural Evolution of Conventionally and Rapidly Tempered Martensite in Medium-carbon Steels
Molybdenum and Niobium Alloying for Property Optimization of Quenched Steels
Multi Length-scale Instrumented Indentation Study on Dual-phase (DP) Steels
Phase Transformation Behaviors In Sandwich-like Clad Sheet Composed of Low and High Carbon Steels
Probabilistic Reconstruction of Prior Austenite Microstructure in Steels after Microstructure Refinement
Reverse Transformation from Martensite into Austenite in a Dual Phase Steel
Short Cycle Tempering of an 1800 MPa Grade of Press Hardening Steel
Substructure of Lenticular Martensite Formed from Austenite Containing Hydrogen in Fe-31Ni Alloy
Tools for Materials Design of Martensitic Materials
Understanding Martensite and Martensitic Phase Transformation under Extreme Environments
Use of In-situ Methods to Investigate the Deformation Induced Martensitic Transformation
Variant Structure of Martensite and Bainite in Steels

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