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| Effect on Carbon Segregation by Solidification Parameters in Steel GCr15 |
| Hu Wen-Hao |
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Abstract The distribution rules of carbon segregation on casting billet were investigated to reduce carbon segregation and improve its properties of deep drawing in steel GCr15, adopting the ways the section of casting billet was drilled and dendritic microstructure was showed. And the effect on carbon segregation index by casting parameters was studied through the regressive analysis of the data in producing process. The study indicates that the average degree of carbon distribution can be improved, when increasing secondary cooling intensity, and diagonal carbon distribution is more average than vertical and horizontal’s in section of GCr15 steel billet; The dendritic distance becomes more and more obvious from exterior to center in casting billet, and it’s especially serious in center, And it’s advantaged to weaken dendritic segregation that increasing secondary cooling intensity; Regressive analysis shows segregation index has maximal relationship with water ratio in secondary cooling, and has low relationship with superheat degree of steel.
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Received: 19 November 2009
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2010, Vol. 45 
