Arc Distribution During the Vacuum Arc Remelting of Ti-6Al-4V
Arc Distribution During the Vacuum Arc Remelting of Ti-6Al-4V
复制标题
Ti-6Al-4V真空电弧重熔过程中的电弧分布
DOI：
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发表时间：
2012
期刊：
影响因子：
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通讯作者：
C. Nordlund
中科院分区：
文献类型：
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作者：
C. Rigel Woodside;Paul E. King;C. Nordlund
目前，真空电弧重熔 (VAR) 过程中电弧在铸锭上的时间分布不是已知的或受监控的工艺参数。先前的研究表明，电弧的分布既不是扩散的，也不是关于炉中心轴对称的。正确计算铸锭中的热通量、电流通量和质量通量对于实现 VAR 工艺的真实凝固模型至关重要。国家能源技术实验室开发了一种电弧位置测量系统，能够定位工业VAR炉内的电弧并确定电弧分布。该系统基于无创磁场测量和毕奥-萨伐尔定律的 VAR 特定形式。该系统安装在俄勒冈州奥尔巴尼 ATI Albany Operations 的同轴工业 VAR 炉上。本文报告了 Ti-6Al-4V 生产过程中观察到的不同电弧分布。结果表明，可以发展出几种特征电弧分布模式。这种行为在用于控制熔炉的现有信号中并不明显，表明测量系统正在提供新信息。还表明，观察到的不同电弧分布模式可能会影响局部凝固时间，特别是在侧壁处。
Currently, the temporal distribution of electric arcs across the ingot during vacuum arc remelting (VAR) is not a known or monitored process parameter. Previous studies indicate that the distribution of arcs can be neither diffuse nor axisymmetric about the center of the furnace. Correct accounting for the heat flux, electric current flux, and mass flux into the ingot is critical to achieving realistic solidification models of the VAR process. The National Energy Technology Laboratory has developed an arc position measurement system capable of locating arcs and determining the arc distribution within an industrial VAR furnace. The system is based on noninvasive magnetic field measurements and a VAR specific form of the Biot–Savart law. The system was installed on a coaxial industrial VAR furnace at ATI Albany Operations in Albany, OR. This article reports on the different arc distributions observed during production of Ti-6Al-4V. It is shown that several characteristic arc distribution modes can develop. This behavior is not apparent in the existing signals used to control the furnace, indicating the measurement system is providing new information. It is also shown that the different arc distribution modes observed may impact local solidification times, particularly at the side wall.
影响因子：
2.4
作者：
B. Nair;R. M. Ward
通讯作者：
B. Nair;R. M. Ward