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Numerical Simulations of the Ohno Continuous Casting Process for Mg - based Amorphous Alloys

机译:基于Mg基非晶合金的OHNO连续铸造方法的数值模拟

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The Ohno continuous casting process for the Mg-based amorphous alloy is simulated using the finite element method. The influences of the temperature in the mold mouth, the cooling distance and the casting rate on the temperature field and the shape of the solid-liquid interface are investigated. It is found that when the temperature in the mold mouth increases from 800°C to 950°C, the convexity of the solid-liquid interface is gradually ' decreasing and the position of the interface is moving outward along the mold. When the cooling distance is extended from 45 mm to 85 mm, the profile of the solid-liquid interface has little change while its corresponding position is gradually far away from the mold mouth. When the casting rate increases from 1.33×10~(-4) m·s~(-1) to 3.33×10~(-4) m·s~(-1), the solid-liquid interface is moving back and forth toward the outside and inside of the mold mouth. The optimal process parameters in the Ohno continuous casting process identified in the simulations are 900°C for the temperature in the mold mouth, 2.50×10~(-4) m·s~(-1) for the casting rate and 60 mm for the cooling distance. The change in the temperature with the time under the optimum parameters is also obtained and the results indicate that the temperature drops rapidly at the very early process and then keeps almost the constant.
机译:使用有限元法模拟基于Mg基非晶合金的OHNO连续铸造方法。研究了温度在模具嘴中的温度,冷却距离和温度场的铸造速率的影响和固液界面的形状。结果发现,当模嘴中的温度从800℃增加至950℃时,固液界面的凸起逐渐地“减小,并且界面的位置沿着模具向外移动。当冷却距离从45mm延伸到85mm时,固液界面的轮廓几乎没有变化,而其相应位置逐渐远离模具嘴。当铸造速率从1.33×10〜(-4)m·s〜(-1)增加到3.33×10〜(-4)m·s〜(-1)时,固液界面正在前后移动朝向模具嘴的外部和内部。在模拟中鉴定的OHNO连续铸造过程中的最佳过程参数为模拟的温度为900°C,铸造速率为2.50×10〜(-4)m·s〜(-1),为60 mm冷却距离。还获得了在最佳参数下的时间的温度的变化,结果表明温度在早期的过程中迅速下降,然后保持恒定。

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