| 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 |
Quantitative Evaluation of Ferrite Growth Behaviors during Decarburization of Fe-C and Fe-C-Mn Alloys |
| Author(s) |
Kanon Sato, Yongjie Zhang, Hidenori Nako, Goro Miyamoto, Tadashi Furuhara |
| On-Site Speaker (Planned) |
Kanon Sato |
| Abstract Scope |
Understanding the ferrite growth kinetics is important for controlling microstructure of multi-phase steels. Driving force for ferrite growth is partially dissipated by local partitioning/segregation of alloying elements at migrating interface with complex crystallographic effects. In this study, ferrite growth behaviors under random orientation relationships were quantitatively evaluated by applying decarburization treatment. Fe-0.74C and Fe-0.77C-2.0Mn (mass%) alloys were decarburized at 973-1023 K for various holding times (60 s-72 ks) to induce one-dimensional ferrite growth from the surface. Energy dissipation was evaluated from the interfacial C content in austenite deviated from para equilibrium. It is found that energy dissipation in Fe-C alloy is negligibly small, leading to C diffusion-controlled growth. In Fe-C-Mn alloy, ferrite grows without macroscopic Mn partitioning. The interfacial C content coincides with NPLE prediction, corresponding to energy dissipations of 50-200 J/mol. In front of this ferrite, film-like ferrite is formed at austenite grain boundaries and grows in PLE mode. |