The Effects of Vanadium, Niobium, Titanium and Zirconium on the Microstructure and Mechanical Properties of Thin Slab Cast Steels

The evolution of precipitation and microstructure during a simulation of the thin slab direct rolling process, in six vanadium based, low carbon, steels with V, V-N, V-Ti-N, V-Nb, V-Nb-Ti and V-Zr additions was studied by optical microscopy, analytical transmission electron microscopy (TEM), energy...

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Bibliographic Details
Published in:ISIJ International 2004/06/15, Vol.44(6), pp.1093-1102
Main Authors: Li, Y., Wilson, J. A., Crowther, D. N., Mitchell, P. S., Craven, A. J., Baker, T. N.
Format: Article
Language:English
Subjects:
Cross-disciplinary physics: materials science
rheology
Deformation, plasticity, and creep
equalisation temperature
Exact sciences and technology
Materials science
mechanical properties
microstructure
nitrogen
Physics
precipitation
thin slab direct rolling
Treatment of materials and its effects on microstructure and properties
vanadium
vanadium-niobium
vanadium-titanium and vanadium-zirconium microalloyed steel
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Summary:The evolution of precipitation and microstructure during a simulation of the thin slab direct rolling process, in six vanadium based, low carbon, steels with V, V-N, V-Ti-N, V-Nb, V-Nb-Ti and V-Zr additions was studied by optical microscopy, analytical transmission electron microscopy (TEM), energy dispersive X-ray analysis (EDAX) and parallel electron energy loss spectroscopy (PEELS). Tensile properties and Charpy vee-notch toughness of the final strip were also determined. The effects of microalloying additions and processing conditions, including equalisation temperature (1 200°C, 1 100°C and 1 050°C) and end water cool temperature, on the austenite and ferrite grain sizes, as well as the type and composition of the precipitates, were determined. The relationship between the microstructure and the properties in the steels was also ascertained.
ISSN:0915-1559
1347-5460
DOI:10.2355/isijinternational.44.1093