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

Abstract

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 improve 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 proposed in the literature. The APT analysis of retained austenite surrounded by martensite demonstrated a higher amount of C content in comparison to 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. 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.

Authors:
ORCiD logo [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)
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
1461048
Alternate Identifier(s):
OSTI ID: 1560642
Report Number(s):
PNNL-SA-132326
Journal ID: ISSN 1047-4838
Grant/Contract Number:  
AC05-00OR22725; AC05-76RL01830
Resource Type:
Accepted Manuscript
Journal Name:
JOM. Journal of the Minerals, Metals & Materials Society
Additional Journal Information:
Journal Volume: 70; Journal Issue: 829; Journal ID: ISSN 1047-4838
Publisher:
Springer
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; Carbon partitioning, quenching and partitioning

Citation Formats

Devaraj, Arun, Xu, Zeren, Abu-Farha, Fadi, Sun, Xin, and Hector, Jr., Louis G. Nanoscale Solute Partitioning and Carbide Precipitation in a Multiphase TRIP Steel Analyzed by Atom Probe Tomography. United States: N. p., 2018. Web. doi:10.1007/s11837-018-2974-1.
Devaraj, Arun, Xu, Zeren, Abu-Farha, Fadi, Sun, Xin, & Hector, Jr., Louis G. Nanoscale Solute Partitioning and Carbide Precipitation in a Multiphase TRIP Steel Analyzed by Atom Probe Tomography. United States. https://doi.org/10.1007/s11837-018-2974-1
Devaraj, Arun, Xu, Zeren, Abu-Farha, Fadi, Sun, Xin, and Hector, Jr., Louis G. Tue . "Nanoscale Solute Partitioning and Carbide Precipitation in a Multiphase TRIP Steel Analyzed by Atom Probe Tomography". United States. https://doi.org/10.1007/s11837-018-2974-1. https://www.osti.gov/servlets/purl/1461048.
@article{osti_1461048,
title = {Nanoscale Solute Partitioning and Carbide Precipitation in a Multiphase TRIP Steel Analyzed by Atom Probe Tomography},
author = {Devaraj, Arun and Xu, Zeren and Abu-Farha, Fadi and Sun, Xin and Hector, Jr., Louis G.},
abstractNote = {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 improve 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 proposed in the literature. The APT analysis of retained austenite surrounded by martensite demonstrated a higher amount of C content in comparison to 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. 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.},
doi = {10.1007/s11837-018-2974-1},
journal = {JOM. Journal of the Minerals, Metals & Materials Society},
number = 829,
volume = 70,
place = {United States},
year = {Tue Jun 26 00:00:00 EDT 2018},
month = {Tue Jun 26 00:00:00 EDT 2018}
}

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Cited by: 15 works
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Figures / Tables:

Fig. 1. Fig. 1.: (a) SEM BSE image showing the overall microstructure of QP980 steel; (b) EBSD image of the same area identifying the distribution and orientation of RA in ferrite and martensite. (c–f) Distribution of Fe, C, Mn, and Si in the ferrite phase of QP980 steel from APT results.

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Works referencing / citing this record:

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 have been extracted from DOE-funded journal article accepted manuscripts.