| 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 |
Pearlite Growth Kinetics in Fe-C-Mn Eutectoid Steels: Quantitative Evaluation of Energy Dissipation at Pearlite Growth Front via Experimental Approaches |
| Author(s) |
Yongjie Zhang, Takemasa Umeda, Satoshi Morooka, Stefanus Harjo, Goro Miyamoto, Tadashi Furuhara |
| On-Site Speaker (Planned) |
Yongjie Zhang |
| Abstract Scope |
Essential understanding of pearlite growth kinetics is crucial to predict the mechanical properties of pearlitic steels. In this study, a series of eutectoid steels with Mn addition up to 2mass% were isothermally transformed at 973K~873K to investigate the growth kinetics and the underlying thermodynamics at the migrating interface during pearlite transformation. Microscopic observation reveals that the pearlite growth rate becomes decelerated accompanied by wider lamellar spacing at higher temperature or with more Mn addition. Neutron diffraction analysis indicates that the magnitude of transformation strain is relatively small. Atom probe analysis of the element distribution at the pearlite growth front shows the enrichment of Mn at the austenite/pearlitic ferrite interface. The driving force for pearlite transformation in the Mn-free alloy is dissipated by interface friction, carbon partitioning and ferrite/cementite interfacial energy. The retarded pearlite growth kinetics by Mn addition can be explained by further energy dissipation induced by solute drag effects. |