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Nanoscale Solute Partitioning and Carbide Precipitation in a Multiphase TRIP Steel Analyzed by Atom Probe Tomography

Journal Article · · JOM. Journal of the Minerals, Metals & Materials Society
 [1];  [2];  [2];  [3];  [4]
  1. Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
  2. Clemson Univ., Greenville, SC (United States)
  3. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  4. General Motors Global Technical Center, Warren, MI (United States)
+ Show Author Affiliations
Nanoscale solute partitioning across multiple constituent phases in a 980-grade quenched and partitioned (Q&P) steel was analyzed using atom probe tomography (APT). The Q&P process was used to increase the C content in the retained austenite phase thereby improving its stability under plastic straining. Significant carbon enrichment of austenite was measured with decreased levels of C in martensite and almost depleted C content in ferrite, supporting the C partitioning mechanism in the literature. The APT analysis of retained austenite surrounded by martensite demonstrated a higher amount of C content compared with retained austenite surrounded by the ferrite phase. Lath and discrete carbide particle precipitation was also observed inside martensite colonies, tying up C and reducing the total amount of C available for austenite stabilization. In addition, the partitioning of Mn and other minor elements was quantitatively investigated by correlating APT and SEM-EBSD. Furthermore, these techniques provide a robust methodology for analyzing nanoscale compositional partitioning in multiphase steels, TRIP steels in particular, which can be used to better explain their microstructure-mechanical property relationships.
Research Organization:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States); Pacific Northwest National Laboratory (PNNL), Richland, WA (United States)
Sponsoring Organization:
USDOE Office of Science (SC)
Grant/Contract Number:
AC05-00OR22725; AC05-76RL01830
OSTI ID:
1461048
Alternate ID(s):
OSTI ID: 1560642
Report Number(s):
PNNL-SA--132326
Journal Information:
JOM. Journal of the Minerals, Metals & Materials Society, Journal Name: JOM. Journal of the Minerals, Metals & Materials Society Journal Issue: 829 Vol. 70; ISSN 1047-4838
Publisher:
SpringerCopyright Statement
Country of Publication:
United States
Language:
English

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Cited By (2)

Geometries of edge and mixed dislocations in bcc Fe from first-principles calculations journal November 2018
Geometries of edge and mixed dislocations in bcc Fe from first principles calculations text January 2018

Figures / Tables (4)

Fig. 1.(p. 3)figure Fig. 1.
Table I.(p. 4)table Table I.
Fig. 2.(p. 5)figure Fig. 2.
Fig. 3.(p. 5)figure Fig. 3.

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Related Subjects

36 MATERIALS SCIENCE
Carbon partitioning
quenching and partitioning