电极缩孔对IN718合金电渣重熔过程影响的数值模拟

IF 0.6 4区 材料科学 Q4 MATERIALS SCIENCE, MULTIDISCIPLINARY 稀有金属材料与工程 Pub Date : 2018-12-01 DOI:10.1016/S1875-5372(19)30002-5
Wang Zixing , Qing Li , Wang Lei
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引用次数: 1

摘要

采用自行开发的电渣重熔模型,对直径为430 mm的IN718合金铸锭电渣重熔过程中电极缩孔的影响进行了数值模拟分析。通过在电极上设计不同形状和大小的缩孔,模拟了电磁力共振系统的电磁场。结果表明:由于缩孔的存在,电极与炉渣的接触面积发生了变化,对炉渣焦耳热和电磁力的分布起主导作用,而缩孔轴向尺寸变化的影响可以忽略不计;模拟了不同半径空腔条件下的等熔化速率ESR过程。结果表明,在一定熔融速率下,缩孔半径小于0.025 m时,缩孔对渣渣重熔过程没有影响;当缩孔半径达到0.05 m时,缩孔对渣流的影响较小。当半径大于0.05 m时,中心向下流动减弱,温度升高,对渣区影响越来越明显。然而,空腔对铸锭的影响不明显,包括熔池和泥区。缩孔半径与电流、功率等ESR熔化参数呈非线性关系,其临界值约为0.05 m。在临界值以下,参数变化微弱甚至没有变化,而在临界值以上,功率和电流参数以近似线性的方式迅速增加。从工艺控制稳定性的角度考虑,缩孔半径应控制在0.05 m以下。
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Numerical Simulation of the Influence of Electrode Shrinkage Cavity on ESR Process of IN718 Alloy

Numerical simulation and analysis of the influence of electrode shrinkage cavity on electroslag remelting (ESR) process of IN718 alloy ingot with a diameter of 430 mm were carried out using the self-developed ESR process model. Electromagnetic fields of ESR system were simulated by a specially designed shrinkage cavity with different shapes and sizes in the electrode. The results show that the contacting area changes between the electrode and the slag owing to the cavity, which plays a predominant role in the distribution of the Joule heat and electromagnetic force in the slag, while the effect of axial dimension change of the shrinkage cavity is negligible. Constant melt rate ESR processes were simulated for different radius cavity situations. It is shown that, at a constant melt rate, the shrinkage cavity has no effect on the ESR process as its radius is less than 0.025 m, and only a small influence on the slag flow when the radius reaches 0.05 m. As the radius increases over 0.05 m, an increasingly evident influence on the slag zone appears via the weakened center downward flow and the increased temperature. Nevertheless, the cavity has no obvious influence on the ingot including the melt pool and mush zone. There is a nonlinear relation between the shrinkage cavity radius and the ESR melting parameters such as current and power, and the critical value of the radius is approximately 0.05 m. Below the critical value, faint or even no change in the parameters appears, while, above the value, the parameters of power and current increase rapidly in an approximately linear manner. From the standpoint of process control stability, the shrinkage cavity radius should be controlled below 0.05 m.

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来源期刊
稀有金属材料与工程
稀有金属材料与工程 工程技术-材料科学:综合
CiteScore
1.30
自引率
57.10%
发文量
17973
审稿时长
4.2 months
期刊介绍:
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