Abstract
In the continuous casting of the microalloyed steel, the slab surface transversal cracking could be prevented through the control of the slab surface microstructure, which correlates with the precipitation behavior of carbonitrides in the microalloyed steel. Therefore, the cooling rate is the key factor to determine the precipitation behavior of carbonitrides. This article used confocal laser scanning microscopy to study the effect of different cooling rates on the precipitation behavior of the carbonitrides in the microalloyed steel slab. When the cooling rate is less than 3 K·s−1, the precipitates in the steel are coarse, growing out along the austenite grain boundaries, and form a chain-like distribution. These precipitates seriously reduced the hot ductility of slab. Quantitative study between the cooling rate and the precipitation behavior of carbonitrides in microalloyed steel also has been developed. The results of this study could be used to improve the understanding of the slab surface microstructure controlling to enhance the hot ductility of the slab and avoid the surface crack of the slab.
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