期刊
SCRIPTA MATERIALIA
卷 95, 期 -, 页码 35-38出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.scriptamat.2014.09.025
关键词
Ferrite; Cementite; Metallic glass; Crystallization
类别
资金
- ANR
- NSERC through the GRACOS project [ANR-09-BLAN-0412]
- Agence Nationale de la Recherche (ANR) [ANR-09-BLAN-0412] Funding Source: Agence Nationale de la Recherche (ANR)
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. (C) 2014 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
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