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Meeting Materials Science & Technology 2019
Symposium Advances in Understanding of Martensite in Steels
Presentation Title Reverse Transformation from Martensite into Austenite in a Dual Phase Steel
Author(s) Dany Michell Andrade Centeno, Hélio Goldenstein
On-Site Speaker (Planned) Dany Michell Andrade Centeno
Abstract Scope A commercial dual phase steel was heat treated to obtain a fully martensitic matrix as the initial condition. Subsequently, different cycles of intercritical reversion led to the development of microstructures composed by laths of martensite, intercritical ferrite and retained austenite. Heat treatments were conducted on a quenching dilatometer. Samples were characterized by SEM-FEG, EBSD, X Ray Diffraction and sub size tensile tests. It was found that the higher the intercritical reversion temperature, the smaller the fraction of intercritical ferrite. On the other hand, the transformation temperature significantly influenced the stability of the retained austenite. The highest fraction of retained austenite was obtained when the transformation occurred slightly above the Ac1 temperature. A double intercritical reversion cycle promoted the diffusion of C and Mn to the reversed austenite making it more stable upon cooling to room temperature, leading to a better combination of strength and ductility.
Proceedings Inclusion? Definite: At-meeting proceedings

OTHER PAPERS PLANNED FOR THIS SYMPOSIUM

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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