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| Hot Ductility of Ti-V Bearing Microalloyed Steel in Continuous Casting |
| Yan-hui SUN,Ya-nan ZENG,Kai-ke CAI |
| Metallurgical and Ecological Engineering School, University of Science and Technology Beijing, Beijing 100083, China |
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Abstract Hot ductility of Ti-V bearing steel was studied by theoretical calculation and thermal simulation experiment. Meanwhile, microsegregation and precipitates were analyzed. The results showed that elements S, Ti and O were enriched at the grain boundaries, while the hot ductility was deteriorated by inclusions of (Fe,Mn,Si,Al)(S,O) in the interdendritic region. At the temperature of 1100 ��, large TiN particles had little effect on hot ductility. In the temperature range from 975 to 925 ��, reduction of area (R. A) declined rapidly from 81. 88% to 63. 16% with the size of particles decreasing from 40 to 20 nm and quantity increasing from 1. 4 to 11. 9 ��m-2, respectively. In the temperature range from 875 to 825 ��, R. A reduced unobviously from 35. 14% to 28. 6% with ferric films thickening gradually. The critical stress, 88. 79 MPa, was equal to tensile strength at 825 ��. Intergranular fracture was easy to occur with higher critical stress below 825 ��.
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Received: 12 October 2012
Published: 15 April 2014
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| Fund:Study on coupling model and precipitation mechansim of second particles in as cast microalloyed steel |
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Corresponding Authors:
Zeng Ya-Nan
E-mail: zengyanann@126.com
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2014, Vol. 21 
