Journal
COMPUTATIONAL MATERIALS SCIENCE
Volume 169, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.commatsci.2019.109079
Keywords
Bainitic transformation; Displacive transformations; Decomposition; Phase field models
Categories
Funding
- NSERC, Canada [155157-2010]
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The interaction between the displacive transformation and the diffusion process during the bainitic type transformation was studied using a phase field model incorporating both processes. A chemical free energy density function was derived to represent thermodynamic properties of low-alloy steels at high supercooling conditions at which the direct transformation from austenite to ferrite at a constant carbon concentration is possible. The results demonstrate that in such conditions both the displacive transformation and diffusional decomposition process may play important roles controlling the transformation kinetics and microstructure. A fast displacive transformation is dominant at the onset of the transformation; however, the diffusion-controlled decomposition can take control over the transformation kinetics and even the ferrite morphology at later stages as a result of the formation of a carbon enriched layer around ferrite grains. Both plate-like and rod-like shapes of ferrite grains can be obtained depending on the thermodynamic conditions and diffusion mobility.
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