Observation of columnar grains in hot bands of ultra low carbon steels

Ultra low carbon (ULC) steels (approx0.002 wt.% carbon) can produce columnar grains grown from near the surface to the center during hot rolling due to the rapid propagation of the ferrite transformation front triggered by severe roll chilling. A combination of carbon contents, final thickness, temp...

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Bibliographic Details
Published in:Scripta materialia 2001-01, Vol.44 (1), p.141-146
Main Authors: Kim, K, Beynon, J.H, Sellars, C.M
Format: Article
Language:English
Subjects:
Applied sciences
Constant-composition solid-solid phase transformations: polymorphic, massive, and order-disorder
Cross-disciplinary physics: materials science
rheology
Exact sciences and technology
Materials science
Metals. Metallurgy
Microstructure
Phase diagrams and microstructures developed by solidification and solid-solid phase transformations
Phase transformation
Physics
Steels
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Summary:Ultra low carbon (ULC) steels (approx0.002 wt.% carbon) can produce columnar grains grown from near the surface to the center during hot rolling due to the rapid propagation of the ferrite transformation front triggered by severe roll chilling. A combination of carbon contents, final thickness, temperature gradient and alloying elements is necessary to produce this transformation induced columnar structure, which is characterised by strong directionality of {111} < 110 > . No columnar grains were observed in the 0.245% Si containing ULC steels.
ISSN:1359-6462
1872-8456
DOI:10.1016/S1359-6462(00)00566-2