Effect of Alloying Elements on Thermal Contraction and Crack Susceptibility during In-Mold Solidification
Effect of Alloying Elements on Thermal Contraction and Crack Susceptibility during In-Mold Solidification
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DOI：
10.1007/s11663-008-9159-1
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发表时间：
2008-07
期刊：
影响因子：
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通讯作者：
M. Ridolfi;A. Vito;L. Ferro
中科院分区：
文献类型：
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作者：
M. Ridolfi;A. Vito;L. Ferro
本文对树枝晶区钢的显微组织性能进行了研究，并确定了一些关键参数，这些参数表示在凝固过程中根据合金成分形成裂纹的倾向。为了解释脆性枝晶区应力的产生，本研究结合了钢在结晶器内凝固的热力学模型。该研究是在Tenaris Siderca， Tamsa和Dalmine的圆坯铸造数据的帮助下进行的。在固相温度下计算的线性热膨胀系数和脆性带宽度被定义为提供合金形成裂纹倾向信息的两个参数。还规定了固相温度下的线性热膨胀系数，在此温度以上钢具有包晶行为。采用耦合建模的方法分析了一些与裂纹和突围有关的实际问题，并从合金成分和模具锥度优化方面提出了解决方案。
A study has been performed on the microstructural properties of steels in the dendritic region with the scope of defining some key parameters denoting the tendency to form cracks during the solidification process, depending on the alloy composition. This study has been coupled to the thermomechanical modeling of the steel solidification inside the mold in order to explain the generation of stresses in the brittle dendritic region. The study has been carried out with the aid of data from round billet casting at Tenaris Siderca, Tamsa, and Dalmine. The linear thermal expansion coefficient calculated at the solidus temperature and the brittle zone width have been defined as the two parameters giving information about the tendency of an alloy to form cracks. The linear thermal expansion coefficient at the solidus temperature, above which steels have peritectic behavior, has also been specified. Some real cases of problems related to cracks and breakouts have been analyzed by means of coupled modeling, and solutions are proposed in terms of alloy composition and mold taper optimization.