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首页> 外文期刊>La Metallurgia Italiana >Influence of casting parameters on shrinkage porosity of a 19 ton steel ingot
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Influence of casting parameters on shrinkage porosity of a 19 ton steel ingot

机译：铸造参数对19吨钢锭收缩孔隙率的影响

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In order to improve metal yield during manufacture of steel ingots, influences of casting parameters on the shrinkage porosity of a 19 ton steel ingot were investigated by numerical simulation. A three-dimensional numerical model of filling and solidification of a 19 ton steel ingot was developed. The model was validated by method of infrared temperature surveying. Based on this model, a series of numerical experiments was carried out and the influences of casting parameters such as height-to-diameter ratio (H/D), taper, height of insulation, pouring temperature and pouring rate on the depth of shrinkage cavity and the tightness in structure were investigated. Two dimensionless factors were proposed to help to evaluate the effect of these casting parameters on the shrinkage porosity. In which, the absolute difference of the maximum and minimum values of each parameter allowed in industrial process, the difference of the two values used in the simulation of each parameter and the difference of the depth of shrinkage cavities calculated under the smaller and larger values of each parameter were all taken into consideration. Results show that decreasing taper, pouring rate and H/D ratio, or increasing height of insulation can all reduce the depth of shrinkage cavity in the ingot effectively so as to improve the metal yield. While, pouring temperature almost has no influence on the depth of shrinkage cavity. H/D ratio and pouring rate have significant negative correlations with density ratio of the ingot. On the contrary, taper has a positive correlation with density ratio of the ingot. Pouring temperature and height of insulation have few influences on the density ratio of the ingot. Decreasing H/D ratio and pouring rate within acceptable limits can reduce the depth of shrinkage cavity and increase the density ratio significantly.
机译：为了提高钢锭制造过程中的金属产量，通过数值模拟研究了铸造参数对19吨钢锭收缩孔隙率的影响。建立了19吨钢锭填充和凝固的三维数值模型。通过红外测温方法对该模型进行了验证。在此模型的基础上，进行了一系列数值实验，研究了铸件参数如高径比（H / D），锥度，绝缘高度，浇注温度和浇注速率对缩孔深度的影响。并研究了结构的密封性。提出了两个无因次因素，以帮助评估这些铸造参数对收缩率的影响。其中，在工业过程中允许的每个参数的最大值和最小值的绝对差，在每个参数的模拟中使用的两个值的差以及在较小和较大值的情况下计算出的收缩腔深度的差每个参数都被考虑在内。结果表明，降低锥度，浇注速率和H / D比，或增加绝缘层的高度，都可以有效地减小铸锭中缩孔的深度，从而提高金属产量。同时，浇注温度几乎对收缩腔的深度没有影响。 H / D比和浇铸速率与铸锭的密度比具有显着的负相关。相反，锥度与铸锭的密度比具有正相关。浇注温度和绝缘层高度对铸锭的密度比影响很小。在可接受的范围内降低H / D比和浇注速率可以减小收缩腔的深度并显着增加密度比。

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