Prediction Of Cracks Of The Continuously
Cast Carbon-steel Slab
Author(s)
J. Dobrovska, V. Dobrovska, K. Stransky, F. Kavicka,
J. Stetina, L. Camek, M.Masarik & J. Heger
Abstract
This paper deals with surface morphology, the mechanism of origination and
causes of cross cracking of a concast low alloy manganese steel slab. The cross
cracking was identified in a steel slab with a sectional size of 145x1300 mm and
the length of the asymmetrical cracking was approximately 600 mm. The light
microscopy and the scanning electron microscopy have been applied for
determination of the metallographic structure of steel and for the study of
micro-morphology and the trajectory of cracking. The chemical
microheterogeneity of the steel matrix and the surface of cracking have been
estimated by means of an X-ray micro-analyser JEOL JXA 8600/KEVEX. The
analyses of Al, Si, P, Ti, Cr, Mn and Fe on the metallograpic samples of the
matrix of steel, of the neighbourhood of cracking and of the surface of cracking
have been realized. It has been found that the cross cracking is characterized by
high macro-heterogeneity of manganese, carbon and sulphur. The causes of cross
cracking have been explained by means of a thermokinetic calculation of a slab
transient temperature field and by mean of an application of the theory of
physical similarity and dimensionless criteria. It has been confirmed that two
solidification cones are formed asymmetrically in the course of slab
solidification and it is probable that the asymmetrically passing crack initiated on
one of these two apexes.
Keywords
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