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Meeting 2016 TMS Annual Meeting & Exhibition
Symposium Phase Transformations in Multi-component Systems: An MPMD Symposium Honoring Gary R. Purdy
Presentation Title Evolution of Mn/Cr Composition Gradients in Cementite during Annealing of DP Steels
Author(s) Marc Moreno, Hugo Van Landeghem, Jaafar Ghanbaja, Julien Teixeira, Frédéric Bonnet, Sébastien Y.P. Allain
On-Site Speaker (Planned) Marc Moreno
Abstract Scope The annealing process of cold-rolled Dual-Phase steels involves numerous mechanisms operating in highly coupled manners during heating as recovery/recrystallization of ferrite, globularisation/ripening/composition evolution of carbides and finally austenite transformation. The microstructure evolutions of studied steel (90C-1800Mn-200Si-200Cr) have been investigated after interrupted annealing thermal cycles thanks to conventional SEM and analytical TEM (JEM-ARM200F). The local compositions in the cementite have been measured by EELS (EFTEM) and EDX with an excellent spatial resolution. In the as rolled state, cementite particles already present Mn/Cr composition gradients inherited from the hot rolled processing schedule (coiling in particular). The U shape profiles are interpreted using current models of the pearlitic transformation. During heating, the gradient intensity decreases due to diffusion and varying partitioning mechanism between cementite and ferrite predicted by thermodynamics. Coupled interactions are observed with Rayleigh instabilities (fragmentation of cementite lamellae). The role of gradients in cementite on the austenite transformation will be discussed.
Proceedings Inclusion? Planned: A print-only volume


An In-situ TEM Investigation of a Reverse Martensite Transformation in an Fe-20Ni-5.4Mn Alloy
An Integrated Model for Microstructure Development in the Heat Affected Zone of Linepipe Steels
Analysis of Mo Effect on the Kinetics of Ferrite and Bainitic Ferrite Formation
Analyzing Internal Interfaces Chemistry down to the Atomic Scale
Atomistic Modeling and Experiments of Spinodal Decompostion in Fe-Ni-C Martensite
Atomistic Simulations of the Interaction of Alloying Elements with Interfaces
Austenite Reversion during Intercritical Annealing in a Medium-Mn Steel: Simulations and Experiments
Carbon Enrichment in Austenite during Ferrite and Bainite Transformations in Fe-Mn-C Based Alloys
Cellular Precipitation in Cu-3% Ti
Diffusional Phase Transformations in Multicomponent Single-Phase/Two-Phase Diffusion couples
Effect of Boron on the Bainitic Transformation Kinetics after Ausforming Process
Effects of Internal Oxidation on Microstructure in Ni Alloy 600
Evolution of Mn/Cr Composition Gradients in Cementite during Annealing of DP Steels
Formation of Widmanstätten Ferrite by the Dynamic Transformation of Austenite at Temperatures Well above the Ae3
Grain Boundary Segregation in Phase Separating Nanocrystalline Alloys: The Role of Competing Processes on Microstructure Evolution
Grain Boundary Segregation of Nb in Fe-30%Mn Austenite Steels
Hidden Pathway and Defects Generation during Structural Phase Transformations
High Throughput Screening of Phase Transformation in Multi-component Ti Alloys: Kinetic Diffusion Multiple
In-situ Observation of Austenite Growth in Very Low Carbon Fe-Ni and Mn Alloys
In Situ Investigations of Partitioning Mechanisms in Q&P Steels by Synchrotron Diffraction Experiments
Incomplete Bainite Transformation in Fe-0.4C-3Si Alloy
Kinetics and Mechanism of Austenite Isothermal Transformation in Carbonitrided Low-alloy Steel
Kinetics of Cellular Growth and Coarsening in Aged U-Nb Alloys
Kinetics of Decomposition in Fe-Cr Alloys and Refractory Carbides
Modelling the Condition of Upper and Lower Bainite Formation
Molecular Dynamics Simulation of fcc/bcc Interface Migration in Pure Iron
New Insights into Alloying Elements Interaction with Migrating α-ferrite/γ-austenite Interface in Fe-C-Mn System
On the Feathery Structure of Bainite
On the Question of Solute Atom Trajectories during Dynamic Segregation
On the Roles of Dislocations in Austenite Reversion from Martensite
Particularities of Kinetics of Austenite Decomposition above and below Martensite-Start Temperature in the Carbide Free Low Alloyed Steel
Pt-Rh Failure through Distinct Phosphorus Diffusion Mechanisms
Quenching and Partitioning of a Ductile Cast Iron
Reversed Austenite Transformation in Medium Manganese Steels
Reversion of Austenite from Martensitic Fe-2Mn-1.5Si-0.3C Alloy during Continuous Heating Process
Segregation and Nanoscale Precipitation in Multi-component Fe-Cu Based Steel
Shortening a CALPHAD Approach by Understanding Parameter Relationships
Solute Drag in a 40 Years Perspective
Solute Interactions at the Ferrite-Austenite Interphase Boundary
T-1: Modeling of Acicular Ferrite Growth
T-2: Phase Equilibria of Vanadium Bearing Slags
T-3: Solid State Reaction of Nd2Fe14B and Carbon
Tempering Behaviour of a Quenched Microalloyed Pipeline Steel
The Effect of C and N on the Cyclic Partial Phase Transformation Behaviour in an Mn Containing Steel
Towards a Unified Analysis of Migrating Austenite/Ferrite Interfaces in Steels
Who Cares About Phase Transformations? A Tribute to Gary Purdy

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