Redistribution of alloying elements during tempering of a nanocrystalline steel
| Autor: | S. Suresh Babu, F. G. Caballero, Carlos Garcia-Mateo, Carlos Capdevila, Michael K Miller |
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| Rok vydání: | 2008 |
| Předmět: |
Austenite
Ledeburite Materials science Polymers and Plastics Bainite Cementite Beta ferrite Metallurgy Metals and Alloys engineering.material Atom-probe field-ion microscopy (AP-FIM) Electronic Optical and Magnetic Materials Carbide chemistry.chemical_compound Tempering chemistry Ferrite (iron) Ceramics and Composites engineering Bainitic steels |
| Zdroj: | Digital.CSIC. Repositorio Institucional del CSIC instname |
| Popis: | Redistribution of alloying elements during tempering of a novel nanocrystalline steel consisting of a mixture of lower bainitic ferrite and carbon-enriched retained austenite has been analysed by atom probe tomography. Three physical processes, namely redistribution of substitutional solute across the austenite/bainitic ferrite interface before retained austenite decomposition, redistribution of solute across the lower bainite cementite/ferrite interface and the precipitation of transition carbides and cementite, have been observed. Results suggest that retained austenite decomposes during tempering before full equilibrium is reached at the interface. Moreover, cementite precipitates from supersaturated ferrite via a paraequilibrium transformation mechanism. The authors acknowledge financial support from European Coal and Steel Community (ECSC 7210-PR-345) and Spanish Ministerio de Ciencia y Tecnologı´a (Project-2006 6 0I 029). CGM would also like to thank Spanish Ministerio de Ciencia y Tecnologı´a for the financial support in the form of a Ramo´n y Cajal contract (Programa RyC 2004). Research at the Oak Ridge National Laboratory SHaRE User Facility was sponsored by the Office of Basic Energy Sciences, Division of Scientific User Facilities, U.S. Department of Energy, under contract DE-AC05- 00OR22725 with UT-Battelle, LLC. The authors would also like to express their special gratitude to Prof. H.K.D.H. Bhadeshia for helpful discussions. |
| Databáze: | OpenAIRE |
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