期刊
JOM
卷 70, 期 9, 页码 1752-1757出版社
SPRINGER
DOI: 10.1007/s11837-018-2974-1
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资金
- Department of Energy [DE-EE0005976]
- United States Automotive Materials Partnership LLC (USAMP)
- US DOE [DE-AC05-00OR22725]
- US Department of Energy (DOE) [DE-AC05-76RL01830]
- Office of Biological and Environmental Research
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.
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