|About this Abstract
||2018 TMS Annual Meeting & Exhibition
||Coupling Advanced Characterization and Modeling Tools for Understanding Fundamental Phase Transformation Mechanisms: An MPMD Symposium in Honor of Hamish Fraser
||Steel Ab Initio: Atomic Scale Characterization and Modeling in the Development of High Strength Steels
||J. Mayer, M. Beigmohamadi, M. Lipinska-Chwalek, Tilmann Hickel, T. Scheu, Christian H. Liebscher, Dierk Raabe, James Edward Wittig
|On-Site Speaker (Planned)
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.
||Planned: Supplemental Proceedings volume