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Meeting 2018 TMS Annual Meeting & Exhibition
Symposium Coupling Advanced Characterization and Modeling Tools for Understanding Fundamental Phase Transformation Mechanisms: An MPMD Symposium in Honor of Hamish Fraser
Presentation Title Steel Ab Initio: Atomic Scale Characterization and Modeling in the Development of High Strength Steels
Author(s) J. Mayer, M. Beigmohamadi, M. Lipinska-Chwalek, Tilmann Hickel, T. Scheu, Christian H. Liebscher, Dierk Raabe, James Edward Wittig
On-Site Speaker (Planned) J. Mayer
Abstract Scope Recently developed high-manganese steels exhibit an exceptional combination of strength and ductility and show great promise e.g. for automotive applications. Understanding the relationships between manganese and carbon content, microstructure, temperature, defect formation and strain-hardening behavior is critical for further optimization of these steels. A combination of HRTEM, HRSTEM, atom probe and ab initio-modeling were used to investigate the influence of alloy content, temperature and deformation behavior on the alloy properties. Experimentally we investigated the microstructural evolution of an austenitic Fe-14Cr-16Mn-0.3C-0.3N alloy showing twinning induced plasticity (TWIP) and of a two-phase nanostructured Fe-30.5Mn-8Al-1.2C alloy exhibiting microband induced plasticity (MBIP). The twinning induced plasticity (TWIP) effect enables designing austenitic Fe-Mn-C based steels with >70% elongation at an ultimate tensile strength >1 GPa. High resolution TEM and STEM images of the planar defects will be presented and comparison to the modeling revealed insight in the atomistic structure of defects and defect/dislocation interaction. In the MBIP alloys, regularly spaced coherent precipitates of the κ-Phase were found, which cause the unique properties of these materials.
Proceedings Inclusion? Planned: Supplemental Proceedings volume


Advanced Characterization and Modeling Tools in the Context of Corrosion
Advances in TiAl- based Alloys
Applications of Ordering Tie Lines to Represent ALCHEMI Data in Intermetallic Compounds and Complex Oxides
Computational Investigation of Omega Phase Evolution in Ti-Mo and Ti-V Systems
Coupled Characterization and Modeling of the Crystallography of Phase Transformations
Deformation by Dislocations, Twinning, and Phase Transformations in Compositionally Concentrated FCC Solid Solutions
Effects of Ternary Element Additions on the Precipitation of α and ω Phases in Ti-Mo Alloys
Evolution of Microstructure and Transformation Texture in Titanium Alloys
Fun-research and Some Exciting Results (FRASER)
How I Learned to Stop Worrying and Love the Metallurgical Play Pen
Lattice Site Correspondence in Active Eutectoid Decomposition in Ti-Cu and Zr-Cu Alloys
New Techniques for Interrogation of Structure in Additively Manufactured Materials
Phase and Intrinsic Stress Stability in Thin Multilayered Films
Phase Stability of Nanostructured Steel Studied by Atom Probe Tomography and the Defactant Concept
Phase Transformations, Microstructure Evolution and Mechanical Properties of Nickel-base Superalloys Studied by Analytical Scanning and Transmission Electron Microscopy
Probabilistic Methodology for Analyzing and Reconstructing Parent Microstructures from EBSD Maps of Transformation Products
Progress with 3-dimensional Materials Science Tools for Aerospace Alloy Engineering
Qualification of Topology Optimized Titanium Parts Made by Additive Manufacturing through In-situ Process Monitoring
Special Lecture by Hamish Fraser
Steel Ab Initio: Atomic Scale Characterization and Modeling in the Development of High Strength Steels
The Need for Advanced Techniques to Couple Multiscale Physics Based Structural Models
The β to α Transformation in Titanium Alloys
Thermoelastic Equilibrium and Superfunctionality of Pre-transitional Materials: Superelasticity, Supermagnetostriction, Invar and Elinvar Effects

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