Abstract
High-temperature laser-scanning confocal microscopy (HT-LSCM) has proven to be an excellent experimental technique through in situ observations of high temperature phase transformation to study kinetics and morphology using thin disk steel specimens. A 1.0 kW halogen lamp within the elliptical cavity of the HT-LSCM furnace radiates heat and imposes a nonlinear temperature profile across the radius of the steel sample. When exposed at the solid/liquid interface, this local temperature profile determines the kinetics of solidification and phase transformation morphology. A two-dimensional numerical heat transfer model for both isothermal and transient conditions is developed for a concentrically solidifying sample. The model can accommodate solid/liquid interface velocity as an input parameter under concentric solidification with cooling rates up to 100 K/min. The model is validated against a commercial finite element analysis software package, strand7, and optimized with experimental data obtained under near-to equilibrium conditions. The validated model can then be used to define the temperature landscape under transient heat transfer conditions.
Issue Section:
Melting and Solidification
Keywords:
concentric solidification,
finite element analysis,
high temperature phase transformation,
confocal microscope
Topics:
Cooling,
Finite element analysis,
Heat,
Heat transfer,
High temperature,
Radiation (Physics),
Solidification,
Temperature,
Temperature distribution,
Transient heat transfer,
Lasers,
Phase transitions,
Microscopy,
Furnaces,
Transients (Dynamics),
Equilibrium (Physics),
Temperature profiles,
Modeling
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