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| Morphology characteristics of macrostructure in 82B steel billet based on high throughput experimental principle |
| PENG Zhi-qiang1,2, CAO Jiang-hai1,2, HOU Zi-bing1,2 |
1. College of Materials Science and Engineering, Chongqing University, Chongqing 400044, China;
2. Chongqing Key Laboratory of Vanadium-Titanium Metallurgy and New Materials, Chongqing University, Chongqing 400044, China |
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Abstract The morphology of the solidification structure has a very important influence on the formation of macrosegregation in billet and determines its subsequent processing performance to some extent. This paper introduces the fractal dimension and dimensionless perimeter to analyze the morphology characteristics of solidification structure in billet of 82B cord steel based on the principle of high throughput experiment. The results show that for the middle zone on both sides of the continuous casting billet,the area ratio of solidification structure obtained by the narrow-width and long-region sampling method can be approximately equivalent to the solid fraction. Meanwhile,the fractal dimension of the overall morphology of the solidification structure increases with the solid fraction,but its dimensionless perimeter shows the opposite trend,so the two have opposite effects on the permeability of the solidification structure. And the calculation shows that the solid fraction corresponding to the minimum permeability of the solidification structure in the actual billet is 0.667. A new method for analyzing the evolution law of solidification structure based on actual casting billet is proposed,which can also provide a reference for the best action area of segregation control technology such as final electromagnetic stirring and soft reduction in continuous casting.
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Received: 21 October 2020
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2021, Vol. 56 
