발간논문

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Vol.36, No.3, 393 ~ 402, 1998
Title
Measurement of In-cast Strand Deformation and Strain Analysis of Dynamic Creep Bulging
이주동 , 임창희 Joo Dong Lee , Chang Hee Yim
Abstract
Strand bulging is presumed to play a major role in the formation of internal cracks and centerline segregation in continuous casting. During the solidification process, the shell is subjected to cyclic mechanical and thermal loads which can cause various defects when the strains exceed critical value. In the present study, multi roll pitch and dynamic creep model has been developed for bulging analysis. Bulging strain was reasonably predicted to increase by repetitative bulging when considering creep damage accumulation by the model. Also cumulative creep bulging strain could be calculated by the regressive equation which has been derived based on the present model. Bulging increase was measured during strand stoppage and compared with the calculated results. Finally we considered the effect of roll misalignment on bulging strain. The model can be used for the caster design and optimum operation for soft reduction, high speed casting, etc.
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