Abstract
A local electrode atom probe has been used to analyze the solute partitioning during bainite transformation in a novel, nanocrystalline bainitic steel. Atom probe results show the absence of any partitioning of substitutional elements between the phases involved. The results are fully consistent with the diffusionless transformation of austenite to bainite. However, substitutional elements are expected to redistribute approaching an equilibrium phase boundary as the mixture of bainitic ferrite and retained austenite is tempered. The compositional analysis of the austenite/ferrite interface by atom probe tomography indicates that retained austenite decomposes during tempering before equilibrium is reached at the interface.
Similar content being viewed by others
References
Caballero FG, Bhadeshia HKDH, Mawella JA, Jones DG, Brown P (2002) Mater Sci Tech 18:279
Bhadeshia HKDH (1981) Acta Metall 29:1117
Bhadeshia HKDH, Edmonds DV (1979) Metall Trans 10A:895
Caballero FG, Miller MK, Babu SS, Garcia-Mateo C (2007) Acta Mater 55:381
Dyson DJ, Holmes B (1970) J Iron Steel Inst 469
Bhadeshia HKDH, David SA, Vitek JM, Reed RW (1991) Mater Sci Tech 7:686
Cullity BD, Stock SR (2001) Elements of X-ray diffraction, 3rd edn. Prentice Hall, Upper Saddle River, p 411
Miller MK (2000) Atom probe tomography. Kluwer Academic/Plenum Press, New York, p 28
https://doi.org/www.msm.cam.ac.uk/map/steel/programs/mucg46-b.html
Matas SJ, Hehemann RF, (1961) Trans Met Soc AIME 221:179
Entin R (1962) In: Zackay VF, Aaronson HI (eds) Decomposition of austenite by diffusional processes. Interscience, New York, p 295
Hehemann RF (1970) Phase transformations. American Society for Metals, Metals Park, Ohio, p 397
Lyman T, Troiano AR (1945) Trans Met Soc AIME 162:196
Lehouillier R, Begin G, Dube A (1971) Metall Trans 2A:2645
Singh SB, Bhadeshia HKDH (1998) Mat Sci Eng A 245:72
Bhadeshia HKDH, Waugh AR (1982) Acta Metall 30:775
Bhadeshia HKDH, Edmonds DV (1980) Acta Metall 28:1265
Christian JW (1979) Phase transformations, vol 1, no 11, series 3. Institute of Metallurgists, London, p 1
Christian JW (1965) The theory of transformations in metals and alloys. Pergamon Press, Oxford
Bhadeshia HKDH, Christian JW (1990) Metall Trans 21A:767
Bhadeshia HKDH (1982) J Phys Colloq C4 43:C4–443
Stark I, Smith GDW, Bhadeshia HKDH (1990) Metall Mater Trans 21A:847
MTDATA (2003) Phase diagram calculation software. National, Physical Laboratory, Teddington
Acknowledgements
The authors acknowledge financial support from European Coal and Steel Community (ECSC 7210-PR-345) and Spanish Ministerio de Ciencia y Tecnología (Project-2006 6 0I 029). CGM would also like to thank Spanish Ministerio de Ciencia y Tecnología for the financial support in the form of a Ramón 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.
Author information
Authors and Affiliations
Corresponding author
Rights and permissions
About this article
Cite this article
Caballero, F.G., Miller, M.K. & Garcia-Mateo, C. The approach to equilibrium during tempering of a bulk nanocrystalline steel: an atom probe investigation. J Mater Sci 43, 3769–3774 (2008). https://doi.org/10.1007/s10853-007-2157-x
Received:
Accepted:
Published:
Issue Date:
DOI: https://doi.org/10.1007/s10853-007-2157-x