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

Devaraj, Arun; Xu, Zeren; Abu-Farha, Fadi; Sun, Xin; Hector, Jr., Louis G.

doi:10.1007/s11837-018-2974-1

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

Journal Article · Tue Jun 26 00:00:00 EDT 2018 · JOM. Journal of the Minerals, Metals & Materials Society

DOI:https://doi.org/10.1007/s11837-018-2974-1· OSTI ID:1461048

^[1]; Xu, Zeren ^[2]; Abu-Farha, Fadi ^[2]; Sun, Xin ^[3]; Hector, Jr., Louis G. ^[4]

Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
Clemson Univ., Greenville, SC (United States)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
General Motors Global Technical Center, Warren, MI (United States)

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.

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Research Organization:: Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Pacific Northwest National Lab. (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, Vol. 70, Issue 829; ISSN 1047-4838

Publisher:: SpringerCopyright Statement

Country of Publication:: United States

Language:: English

Citation Metrics:

Cited by: 15 works

Citation information provided by
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Cited By (2)

Geometries of edge and mixed dislocations in bcc Fe from first-principles calculations Fellinger, Michael R.; Tan, Anne Marie Z.; Hector, Louis G. Physical Review Materials, Vol. 2, Issue 11 https://doi.org/10.1103/physrevmaterials.2.113605	journal	November 2018
Geometries of edge and mixed dislocations in bcc Fe from first principles calculations Fellinger, Michael R.; Tan, Anne Marie Z.; Hector, Louis G. arXiv https://doi.org/10.48550/arxiv.1808.09512	text	January 2018

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