Atom Probe Tomography Analysis of Precipitation during Tempering of a Nanostructured Bainitic Steel

Journal Article · Sat Jan 01 04:00:00 EST 2011 · Metallurgical and Materials Transactions A

DOI:https://doi.org/10.1007/s11661-011-0699-7· OSTI ID:1049059

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

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

Carbon distribution during tempering of a nanostructured bainitic steel was analyzed by atom probe tomography (APT). Three different types of particles are detected on samples tempered at 673 K (400 C) for 30 minutes: lower bainite cementite with a carbon content of {approx}25 at. pct, {var_epsilon}-carbides with a carbon content close to 30 at. pct, and carbon clusters, small features with a carbon content of {approx}14 at. pct indicative of a stage of tempering prior to precipitation of {var_epsilon}-carbide. After tempering at 773 K (500 C) for 30 minutes, the {var_epsilon}-carbide-to-cementite transition was observed. Solute concentration profiles across carbide/ferrite interfaces showed the distribution of substitutional elements in {var_epsilon}-carbide and cementite for all the tempering conditions.

• 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: 1049059
• Journal Information: Metallurgical and Materials Transactions A, Journal Name: Metallurgical and Materials Transactions A Journal Issue: 12 Vol. 42A; ISSN 1073-5623
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ATOMS
BAINITE
CARBON
CEMENTITE
DISTRIBUTION
PRECIPITATION
PROBES
SOLUTES
STEELS
TEMPERING
TOMOGRAPHY