The approach to equilibrium during tempering of a bulk nanocrystalline steel: an atom probe investigation

Journal Article · Tue Jan 01 04:00:00 EST 2008 · Journal of Materials Science

DOI:https://doi.org/10.1007/s10853-007-2157-x· OSTI ID:936034

Caballero, Francesca G. ^[1]; Miller, Michael K ^[2]; Mateo, C. Garcia ^[1]

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1. CENIM-CSIC, Madrid, Spain
2. ORNL

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.

• Research Organization: Oak Ridge National Laboratory (ORNL); Shared Research Equipment Collaborative Research Center
• Sponsoring Organization: SC USDOE - Office of Science (SC)
• DOE Contract Number: AC05-00OR22725
• OSTI ID: 936034
• Journal Information: Journal of Materials Science, Journal Name: Journal of Materials Science Journal Issue: 11 Vol. 43; ISSN JMTSAS; ISSN 0022-2461
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ATOMS
AUSTENITE
Atom probe tomography
BAINITE
Bainite
FERRITE
MIXTURES
NANOSTRUCTURES
PARTITION
PHASE TRANSFORMATIONS
PROBES
Phase transformation
SOLUTES
STEELS
Steels
TEMPERING
TOMOGRAPHY