|About this Abstract
||2018 TMS Annual Meeting & Exhibition
||Phase Transformation Across Multiscale Material Interfaces
||Roles of Transformation Interface for Controlling Microstructure and Properties of High Strength Steels
||Tadashi Furuhara, Yongjie Zhang, Goro Miyamoto
|On-Site Speaker (Planned)
Alloying effects at transformation interfaces are important in controlling mechanical properties of modern high strength steels. Two examples in low-alloy steels will be discussed with emphasis on thermodynamics, kinetics and crystallography.
For strengthening of ferritic steels with interphase precipitation of alloy carbide accompanied ferrite transformation, clarification of conditions for refining carbide dispersion is most important. It will be emphasized that larger driving force of precipitation in combination with incoherent ferrite/austenite interfaces results in finer carbide dispersion. In TRIP-aided low-alloy steels, it is essential to control carbon enrichment in austenite during ferrite/bainite transformations and resulting stability of retained austenite. Recent studies on alloy partitioning including carbon enrichment into austenite give us more insight into the transformation mechanism. We will describe that energy dissipation during interface migration and strain energy accumulation are important factors to control carbon enrichment into untransformed austenite.
||Planned: Supplemental Proceedings volume