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Solidification modelling of microstructure in twin‐roller thin strip casting of stainless steels
Author(s) -
Thiem Steffen,
Löser Wolfgang,
Jurisch Manfred
Publication year - 1993
Publication title -
steel research
Language(s) - English
Resource type - Journals
eISSN - 1869-344X
pISSN - 0177-4832
DOI - 10.1002/srin.199301027
Subject(s) - microstructure , dendrite (mathematics) , metallurgy , die (integrated circuit) , chemistry , strips , heat transfer , composite material , materials science , physics , thermodynamics , geometry , nanotechnology , mathematics
The influence of process parameters on the dendritic microstructure of thin strips cast by the twin‐roll method is analyzed in the framework of a one‐dimensional solidification model and compared with experimental results. As a relevant characteristic the secondary dendrite arm spacing Λ 2 as a function of the distance x from the roll surface is investigated. The difference between the local dendrite arm spacing near the strip surface and the strip centre, respectively, increases with the strip thickness and only depends on the casting temperature to a small extent. An increase in the strip/roller heat transfer coefficient due to a rising casting velocity or possibly enhanced roll‐separating forces leads to a decrease in the dendrite arm spacing. The effect of a sudden decrease in heat transfer during the solidification process, on the Λ 2 ( x ) characteristics, e.g. by a local separation of the solidified shell from the roller surface, is discussed.