Experimental Examination of Method for Estimating Solid Fraction at Flow Cessation from Flow Velocity of Molten Al-Si-Mg Alloy

Kuiyuan Mu, M. Nikawa, M. Yamashita
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Abstract

The purpose of this study was to experimentally estimate the solid fraction at which the cessation of the flow of a molten Al-Si-Mg alloy (JIS-AC4C) occurs in casting. The flow cessation mechanism of JIS-AC4C is known as the “mushy” formation type, which means that the flow ceases when the solid fraction at the molten metal tip reaches a certain critical value. Therefore, the flow velocity at the molten metal tip is assumed to decrease gradually. Thus, a new method for calculating the solid fraction at flow cessation based on computer simulations was examined using experimental measurements of the flow velocity and flow length. As a result of the experiment, the flow length became longer as the mold temperature and molten metal temperature increased. The flow velocity gradually decreased from the initial stage, but there was a region where the velocity was almost constant after the initial stage. The molten metal temperature became lower from the root side to the tip side, and the solid fraction at the time of flow cessation was calculated from the measurement results, and it was approximately 0.35-0.4 near the tip. Computer simulations were performed by tuning the heat transfer coefficients so that the flow length and flow velocity would match the experimental results and could simulate the changes in flow velocity obtained from the experiments. The solid fraction at the tip of the molten metal was almost the same as the experimental results. These results showed that it is possible to estimate the solidus fraction at the flow cessation from the flow velocity at the tip. It is easier and more accurate to calculate the flow ceased solid fraction by measuring the flow velocity of the molten metal tip. As a reference value, we were able to improve the calculation accuracy by comparing and verifying the flow ceased solid fraction calculated by the conventional calculation method from temperature.
用Al-Si-Mg合金熔体流动速度估算停止流动时固体分数方法的实验检验
本研究的目的是通过实验估计Al-Si-Mg合金(JIS-AC4C)熔体在铸造过程中停止流动的固体分数。JIS-AC4C的停止流动机制被称为“糊状”形成型,即当金属液尖端的固体分数达到一定临界值时,停止流动。因此,假设熔融金属尖端处的流速逐渐减小。在此基础上,研究了一种基于计算机模拟的计算停止流动时固体分数的新方法,该方法采用流速和流动长度的实验测量。实验结果表明,随着模具温度和金属液温度的升高,流动长度变长。从初始阶段开始,流速逐渐减小,但在初始阶段之后存在一个流速几乎恒定的区域。熔融金属温度从根侧向尖端侧逐渐降低,根据测量结果计算出流动停止时的固相分数,在尖端附近约为0.35-0.4。通过调整换热系数,使流长和流速与实验结果相匹配,模拟实验得到的流速变化,进行计算机模拟。熔液尖端的固相分数与实验结果基本一致。这些结果表明,可以从尖端的流动速度估计出流动停止时的固相分数。通过测量熔化金属尖端的流动速度来计算流动停止固体分数是比较容易和准确的。以温度为参照,对比验证了常规计算方法计算的流动停止固相分数,提高了计算精度。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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