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| Causes analysis on the thermoplastic brittle region �� of medium manganese steel |
| WANG Yu-tian1��WANG Cun-yu1,2��SHI Fa-cai1��TAO Hong-biao3 |
1. Technology Center of Taiyuan Iron and Steel Group Co.�� Ltd.�� Taiyuan 030003��Shanxi�� China
2. East China Branch of Central Iron and Steel Research Institute�� Beijing 100081�� China
3. National Engineering and Research Center of Continuous Casting Technology��Central Iron and Steel Research Institute�� Beijing 100081�� China |
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Abstract Transverse corner crack is likely to occur on slab of medium manganese steel. The thermoplastic of medium manganese steel was studied using Gleeble thermal-mechanical simulator�� and the causes of the brittle region �� were analyzed through microstructure characterization and thermodynamics analysis. The results show that the brittle region ��was occurred at the temperature of 550-775 �棬 and the ferrite phase transformation induced by deformation cause the lowest thermoplasticity at the deformation temperature of 750 ��.Therefore�� at the practical process�� the quantity of water in the secondary cooling zone of continuous casting should be controlled carefully to avoid the corner crack of continuous cast billet.
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Received: 14 September 2015
Published: 13 January 2016
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2015, Vol. 40 
