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| Characteristics of Solute Segregation on Brittle Zone at Solidifying Front of Microalloy Steel |
| ZENG Ya-nan,SUN Yan-hui,CAI Kai-ke |
| Metallurgical and Ecological Engineering School, University of Science and Technology Beijing, Beijing 100083, China |
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Abstract Based on numerous cracks in continuous cast billets during solidification, the crack susceptibility and solute segregation was investigated by theoretical calculation and thermal simulation experiment. The results show that the solid volume fraction of microalloy steel between 0.75 and 1.00, the segregation degree of elements C, Mn is lower than S, P, Ti. While the S content raises to 1.2%, the segregation degree of element S decreases to 20.7; the influence degree of brittle zone is Mn>S>C>P>Ti, the brittle zone temperature enlarges from 25K to 33K, 15K to 38K with the content of S, Mn increases from 0.002% to 0.02%, 0.2% to 1.6%, respectively. Meanwhile, steel embitterment has no direct relation with solidification structure was confirmed by thermal simulation experiment.
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Received: 28 April 2012
Published: 14 January 2013
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2012, Vol. 47 
