2019 Pittsburgh AISTech

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3D Thermal-Mechanical Model of Solidifying Steel Strand (Room 411)

Thermal-mechanical behavior of a chunk of the strand in a thick-slab caster is simulated from initial solidification to the end of the caster, including spray cooling and roll contact using a fully three-dimensional transient Lagrangian finite element model. The model features efficient linearizations of phase-, temperature-, carbon content-, and strain-rate-dependent, constitutive equations; as well as temperature-dependent thermal properties. Surface temperature drops and tensile hoop stresses during spray region impingement, outer radius tension during bending, inner radius tension during unbending, and bulging between rolls are quantified. Slab corners experience higher stresses due to their lower temperature, producing higher strength and extra mechanical constraints.