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Metallurgical and Materials Transactions A
Published in: Metallurgical and Materials Transactions A 4/2008

01-04-2008 | Communication

Scanning Transmission Electron Microscopy Study of Interfacial Segregation of Mn during the Formation of Partitioned Grain Boundary Ferrite in a Fe-C-Mn-Si Alloy

Authors: H. Guo, G.R. Purdy

Published in: Metallurgical and Materials Transactions A | Issue 4/2008

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Abstract

Interfacial segregation of Mn was studied during the growth of partitioned ferrite allotriomorphs from austenite at 656 °C in a Fe-0.37C-3.0Mn-1.90Si alloy. Quantitative estimates of the segregation were obtained by combining scanning transmission electron microscopy (STEM) raster window scanning with simulation of the interaction of the electron beam with the sample. For most interfaces, the estimated Mn interfacial segregation is of the order of one-half monolayer. Certain interfaces, however, possessed a much lower level of Mn enhancement and showed no evidence of a Mn buildup in the parent austenite; it is considered that these were essentially immobile under the conditions of precipitate growth.
previous article Prediction of the Mixing Enthalpies of the Al-Cu-Ni-Zr Quaternary Alloys by the Molecular Interaction Volume Model

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Footnotes
1
JEOL is a trademark of Japan Electron Optics Ltd., Tokyo.
 
2
The segregation levels can also be described in terms of a number of monolayers,[9] each of which contains a 2 segregant atoms per unit area, where a 3 is the atomic volume of the segregant. The atomic volume is usually determined from the first phase that occurs if the solute concentration is increased just beyond the solubility limit. According to the Fe-Mn phase diagram,[10] the corresponding phase is α Mn, which has a complex bcc structure, with lattice parameter 8.89 Å and 58 atoms per unit cell. Then, a monolayer of Mn has 18.90 atoms/nm2; the segregation, expressed in monolayers, will be calculated by dividing Γ (the coverage in atoms/nm2) by 18.90.
 
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S.S. Babu, H.K.D.H. Bhadeshia: Mater. Sci. Eng., 1991, vol. A142, pp. 209–19
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Smithells’ Metals Reference Book, 7th ed., E.A. Brandes and G.B. Brook, eds., Butterworth-Heinemann Ltd., Oxford, United Kingdom, 1992, p. 11-285
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J. Fridberg, L.E. Törndahl, M. Hillert: Jernkont. Ann., 1969, vol. 153, pp. 263–76
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M. Hillert: Phase Equilibria, Phase Diagrams & Phase Transformations, Cambridge University Press, Cambridge, United Kingdom, 1998, p. 363
Metadata
Title
Scanning Transmission Electron Microscopy Study of Interfacial Segregation of Mn during the Formation of Partitioned Grain Boundary Ferrite in a Fe-C-Mn-Si Alloy
Authors
H. Guo
G.R. Purdy
Publication date
01-04-2008
Publisher
Springer US
Published in
Metallurgical and Materials Transactions A / Issue 4/2008
Print ISSN: 1073-5623
Electronic ISSN: 1543-1940
DOI
https://doi.org/10.1007/s11661-008-9473-x

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