| About this Abstract |
| Meeting |
MS&T24: Materials Science & Technology
|
| Symposium
|
Austenite Formation and Decomposition V: A Symposium in Memory of Prof. Mats Hillert
|
| Presentation Title |
Partitioning and Non-Partitioning Growth of Austenite during Double-Soaking Treatments |
| Author(s) |
Joshua J. Mueller, Alexandra G. Glover, John G. Speer, Emmanuel De Moor |
| On-Site Speaker (Planned) |
Joshua J. Mueller |
| Abstract Scope |
Double-soaking (DS) is a thermal treatment for medium-manganese steels that is intended to generate microstructures predominantly consisting of martensite and retained austenite. The DS treatment consists of two isothermal austenite-forming portions; a primary, lower temperature segment to form Mn-rich austenite followed by a secondary, higher temperature segment to induce further austenite growth. The present work is concerned with formation of austenite during secondary soaking (SS). Previous research suggests a transition from partitioning to non-partitioning growth of austenite during SS of a Fe-Mn binary alloy with increasing SS temperature. The present work expands this discussion to consider Fe-Mn-C alloys and draws on concepts relating to partitioning and non-partitioning phase transformations in Fe-X-C alloys. Phase field simulations that describe transitions in phase transformation mechanisms and experimental characterization of the Mn concentration distribution will be presented. Thermodynamic constructions will be discussed that support the phase transformation mechanisms suggested by simulation and experimental characterization. |