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首页> 外文会议>TMS(The Minerals, Metals amp; Materials Society) Annual Meeting and Symposium on Solidification of Aluminum Alloys; 20040314-20040318; Charlotte,NC; US >A New Two-phase Thermo-mechanical Model and Its Application to The Study of Hot Tearing Formation During The Start-up Phase of DC Cast Ingots
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A New Two-phase Thermo-mechanical Model and Its Application to The Study of Hot Tearing Formation During The Start-up Phase of DC Cast Ingots

机译：新型两相热力学模型及其在直流铸锭启动阶段热撕裂形成研究中的应用

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The purpose of this work is to present a new 2D two-phase simulator for the prediction of hot tearing formation in DC casting of aluminum ingots. In this model, the main mechanisms for the formation of hot tears during solidification, namely thermally-induced deformations, and the lack of liquid feeding to compensate for solidification shrinkage and viscoplastic volumetric dilatation, are addressed simultaneously. In the modeling, the liquid flow, the stresses and the strains in the two-phase mushy zone are calculated using an advanced model for the viscoplastic deformation of the semi-solid material. In the present article, the modeling equations are solved numerically for the direct-chill casting of axi-symmetric aluminum extrusion ingot. In order to study the effect of the casting speed on the formation of center hot-cracks, new hot tearing criteria based on the mechanical quantities resulting from the simulations are compared to experimental results from casting trials with varying the casting speed ramping during the casting process.
机译：这项工作的目的是提出一种新的二维两相模拟器，用于预测铝锭直流铸造中的热撕裂形成。在该模型中，同时解决了凝固过程中形成热裂的主要机理，即热致变形以及缺少补液来补偿凝固收缩和粘塑性体积膨胀的问题。在建模中，使用高级模型对半固态材料的粘塑性变形进行计算，计算出两相糊状区中的液体流动，应力和应变。在本文中，数值求解了轴对称铝挤压铸锭直接冷铸的建模方程。为了研究铸造速度对中心热裂纹形成的影响，将基于模拟得出的机械量的新热撕裂标准与铸造试验的实验结果进行了比较，其中在铸造过程中改变了铸造速度的变化。

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