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首页> 外文期刊>Metallurgical and Materials Transactions, A. Physical Metallurgy and Materials Science >Aluminum Volatilization and Inclusion Removal in the Electron Beam Cold Hearth Melting of Ti Alloys
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Aluminum Volatilization and Inclusion Removal in the Electron Beam Cold Hearth Melting of Ti Alloys

机译：钛合金电子束冷床熔炼中铝的挥发和夹杂物去除

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The electron beam cold hearth melting (EBCHM) process has emerged as either an alternative or a complement to vacuum arc remelting, since it is capable of enhancing the elimination of hard-alpha inclusions by dissolution or sedimentation. The present article describes the use of a mathematical model to simulate the electron beam melting of titanium in a cold hearth. The mathematical model is based on the numerical solution of the coupled momentum, solute, and heat transport equations in a transient regime for a three dimension geometry. The model calculates the velocity, turbulence intensity, temperature, and alloy composition in the liquid and the solid phases. The calculation provides the overall heat balance and the volatilization of metallic elements such as aluminum. A postprocessor numerical tool simulates also the behavior of a hard-alpha inclusion during melting (trajectory and kinetics of dissolution). In order to demonstrate the usefulness of this model, the authors examine the influence of the casting rate and of the beam scanning frequency on the volatilization of aluminum and on the capacity of the process to remove hard-alpha defects.
机译：电子束冷炉床熔化（EBCHM）工艺已成为真空电弧重熔的替代方法或补充方法，因为它能够通过溶解或沉淀来增强对硬α夹杂物的消除。本文介绍了使用数学模型来模拟冷炉膛中钛的电子束熔化的情况。该数学模型基于三维几何结构在瞬态状态下耦合的动量，溶质和热传递方程的数值解。该模型计算液相和固相中的速度，湍流强度，温度和合金成分。该计算提供了总体热量平衡和金属元素（如铝）的挥发。后处理器数值工具还可以模拟熔融过程中硬α夹杂物的行为（溶出的轨迹和动力学）。为了证明该模型的实用性，作者检查了铸造速率和束扫描频率对铝挥发的影响以及对去除硬α缺陷的工艺能力的影响。

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