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

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 plasti...

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Bibliographic Details
Published inJOM (1989) Vol. 70; no. 9; pp. 1752 - 1757
Main Authors Devaraj, Arun, Xu, Zeren, Abu-Farha, Fadi, Sun, Xin, Hector, Louis G.
Format Journal Article
LanguageEnglish
Published New York Springer US 01.09.2018
Springer Nature B.V
Subjects
3D Nanoscale Characterization of Metals
Austenite
Carbides
Carbon
Chemical precipitation
Chemistry/Food Science
Ductility
Earth Sciences
Engineering
Environment
Heat treating
Iron constituents
Maintenance management
Martensite
Materials
Mechanical properties
Medical imaging
Microstructure
Minerals
Multiphase
Particle precipitation
Partitioning
Physics
Plastic deformation
Retained austenite
Software
Steel
Steel constituents
Temperature
Temperature effects
Tomography
TRIP steels
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Summary: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. 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.
ISSN:1047-4838
1543-1851
DOI:10.1007/s11837-018-2974-1