Three-dimensional atom probe analysis of solute distribution in thermomechanically processed TRIP steels

Pereloma, E., Timokhina, Ilana, Miller, M. and Hodgson, Peter 2007, Three-dimensional atom probe analysis of solute distribution in thermomechanically processed TRIP steels, Acta materialia, vol. 55, no. 8, pp. 2587-2598, doi: 10.1016/j.actamat.2006.12.001.

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Title Three-dimensional atom probe analysis of solute distribution in thermomechanically processed TRIP steels
Author(s) Pereloma, E.
Timokhina, IlanaORCID iD for Timokhina, Ilana
Miller, M.
Hodgson, Peter
Journal name Acta materialia
Volume number 55
Issue number 8
Start page 2587
End page 2598
Publisher Elsevier Science Pub.
Place of publication New York, NY
Publication date 2007-05
ISSN 1359-6454
Keyword(s) TRIP steels
thermomechanical processing
three-dimensional atom probe
phase transformations
transmission electron microscopy
Summary Complex multiphase microstructures were obtained in transformation induced plasticity C–Mn–Si–(Nb–Al–Mo) steels by simulated controlled thermomechanical processing. These microstructures were characterized using transmission electron microscopy, X-ray diffraction and three-dimensional atom probe tomography (APT), which was used to determine the partitioning of elements between different phases and microconstituents. The measured carbon concentration (not, vert, similar0.25 at%) in the ferrite of carbide-free bainite was higher than expected from para-equilibrium between the austenite and ferrite, while the concentrations of substitutional elements were the same as in the parent austenite suggesting that incomplete bainite transformation occurred. In contrast, the distribution of substitutional elements between the ferrite lath and austenite in carbide-containing bainite indicated a complete bainite reaction. The average carbon content in the retained austenite (3.2 ± 1.6 at%) was somewhat higher than the T0 limit. On the basis of the APT measured composition, the calculated Ms temperatures for retained austenite were above room temperature, indicating its low chemical stability.
Notes Available online 15 February
Language eng
DOI 10.1016/j.actamat.2006.12.001
Field of Research 091207 Metals and Alloy Materials
HERDC Research category C1 Refereed article in a scholarly journal
Copyright notice ©2007, Acta Materialia Inc.
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