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首页> 外文期刊>Journal of Materials Engineering and Performance >Casting/Mold Thermal Contact Heat Transfer during Solidification of Al-Cu-Si Alloy (LM 21) Plates in Thick and Thin Molds
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Casting/Mold Thermal Contact Heat Transfer during Solidification of Al-Cu-Si Alloy (LM 21) Plates in Thick and Thin Molds

机译：厚模和薄模中Al-Cu-Si合金（LM 21）板凝固过程中的铸造/模具热接触传热

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摘要

Heat flow at the casting/mold interface was assessed and studied during solidification of Al-Cu-Si (LM 21) alloy in preheated cast iron molds of two different thicknesses, coated with graphite and alumina based dressings. The casting and the mold were instrumented with thermocouples connected to a computer controlled temperature data acquisition system. The thermal history at nodal locations in the mold and casting obtained during experimentation was used to estimate the heat flux by solving the one-dimensional inverse heat conduction problem. The cooling rate and solidification time were measured using the computer-aided cooling curve analysis data. The estimated heat flux transients showed a peak due to the formation of a stable solid shell, which has a higher thermal conductivity compared with the liquid metal in contact with the mold wall prior to the occurrence of the peak. The high values of heat flux transients obtained with thin molds were attributed to mold distortion due to thermal stresses. For thin molds, assumption of Newtonian heating yielded reliable interfacial heat transfer coefficients as compared with one-dimensional inverse modeling. The time of occurrence of peak heat flux increased with a decrease in the mold wall thickness and increase in the casting thickness.
机译：在Al-Cu-Si（LM 21）合金在两种不同厚度的预热铸铁模具中固化的过程中，评估并研究了铸件/模具界面处的热流，该铸铁模具涂有石墨和氧化铝基的敷料。铸件和模具用热电偶连接到计算机控制的温度数据采集系统。实验中获得的结晶器和铸件中节点位置处的热历史通过解决一维逆导热问题来估算热通量。使用计算机辅助的冷却曲线分析数据测量冷却速率和固化时间。估计的热通量瞬变显示出一个峰值，这是由于形成了一个稳定的固体壳，与出现该峰值之前与模具壁接触的液态金属相比，它具有更高的导热率。用薄模具获得的高通量瞬变值归因于由于热应力引起的模具变形。对于薄模具，与一维逆模型相比，牛顿加热的假设产生了可靠的界面传热系数。峰值热通量的发生时间随着结晶器壁厚的减少和铸件厚度的增加而增加。

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