Determination of the intrinsic α/γ interface mobility during massive transformations in interstitial free Fe-X alloys

Determination of the intrinsic α/γ interface mobility during massive transformations in interstitial free Fe-X alloys

Zhu, Jianing (Tsinghua University)
Luo, Haiwen (University of Science and Technology Beijing)
Yang, Zhigang (Tsinghua University)
Zhang, Chi (Tsinghua University)
van der Zwaag, S. (TU Delft Novel Aerospace Materials)
Chen, H. (Tsinghua University)

2017-07-01

Kinetics of the austenite (γ) to ferrite (α) transformation and the reverse ferrite (α) to austenite (γ) transformation in a series of Fe-X (X = Ni, Mn and Co) binary alloys has been experimentally and theoretically investigated. A transition from partitioning to partitionless transformation has been predicted to occur during both the γ→α and α→γ transformations by a so called Gibbs Energy Balance (GEB) model, in which the chemical driving force is assumed to be equal to the energy dissipation due to interface friction and diffusion of X inside the migrating interfaces. The transition temperature is found to depend on the kind of X and its concentration, which is in good agreement with experimental results. The intrinsic mobility of the α/γ interface has been derived from the kinetic curves of both the γ→α and α→γ transformations in the investigated alloys, and its value seems to be marginally affected by the transformation direction and alloying elements.

Austenite
Ferrite
Interface mobility
Massive transformation

http://resolver.tudelft.nl/uuid:fd2760b5-b7a5-4bdd-a053-9f7e01c5886b

https://doi.org/10.1016/j.actamat.2017.05.045

2019-05-29

1359-6454

Acta Materialia, 133, 258-268

Institutional Repository

journal article

© 2017 Jianing Zhu, Haiwen Luo, Zhigang Yang, Chi Zhang, S. van der Zwaag, H. Chen