| 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 |
Carbon Solute Drag Effect on the Growth of Carbon Supersaturated Bainitic Ferrite |
| Author(s) |
Zongbiao Dai, Junjie Sun, Hao Chen, Sybrand van der Zwaag, Jun Sun |
| On-Site Speaker (Planned) |
Zongbiao Dai |
| Abstract Scope |
The carbon partitioning and lengthening rate of bainitic ferrite are excellent experimental parameters for elucidating the mechanism of bainitic transformation. The classical Zener-Hillert theory captures the bainitic transformation rather well but mispredicts the level of carbon in solution in the bainite and overestimates the lengthening rates for transformations at lower temperatures. To address this issue, a model based on the Zener-Hillert theory and the Gibbs energy balance concept was proposed to simulate the lengthening behavior of bainitic ferrite. The model incorporates the carbon solute drag effect exerted on the migrating interface but does not impose local equilibrium across the interface. We found that both the degree of carbon supersaturation and the lengthening rate of bainitic ferrite can be accurately predicted. Based on the diffusional-displacive growth mechanism, an ongoing attempt is being made to predict the transformation stasis by considering the carbon solute drag effect and transformation strain. |