On the direct nucleation and growth of ferrite and cementite without austenite

The direct nucleation and growth of ferrite and cementite has been investigated in an Fe–C metallic glass using X-ray diffraction, transmission electron microscopy and atom probe tomography. The nucleation and growth proceeds via primary crystallization of ferrite, without the formation of austenite...

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Bibliographic Details
Published in:Scripta materialia 2015, Vol.95, p.35-38
Main Authors: Fillon, A., Sauvage, X., Lawrence, B., Sinclair, C., Perez, M., Weck, A., Cantergiani, E., Epicier, T., Scott, C.P.
Format: Article
Language:English
Subjects:
Amorphous materials
Austenite
Carbon
Cementite
Crystallization
Engineering Sciences
Ferrite
Materials
Metallic glass
Nucleation
Nuclei
Transformations
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Summary:The direct nucleation and growth of ferrite and cementite has been investigated in an Fe–C metallic glass using X-ray diffraction, transmission electron microscopy and atom probe tomography. The nucleation and growth proceeds via primary crystallization of ferrite, without the formation of austenite. There is no carbon gradient at ferrite/amorphous interfaces, indicating that the transformation rate is controlled by the low mobility of these interfaces compared to the mobility of C atoms. A thermodynamic description is proposed to explain the delayed nucleation of cementite.
ISSN:1359-6462
1872-8456
DOI:10.1016/j.scriptamat.2014.09.025