| Project/Area Number |
63850146
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| Research Category |
Grant-in-Aid for Developmental Scientific Research (B).
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| Allocation Type | Single-year Grants |
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| Research Field |
金属加工(含鋳造)
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| Research Institution | The University of Tokyo |
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Principal Investigator |
UMEDA Takateru The University of Tokyo, Department of Metallurgy, Professor, 工学部, 教授 (50011078)
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| Co-Investigator(Kenkyū-buntansha) |
IKEDA Minoru The University of Tokyo, Department of Metallurgy, Research associate, 工学部, 助手 (50167243)
SUZUKI Toshio The University of Tokyo, Department of Metallurgy, Associate Professor, 工学部, 助教授 (70115111)
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| Project Period (FY) |
1988 – 1990
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| Project Status |
Completed (Fiscal Year 1990)
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| Budget Amount *help |
¥6,700,000 (Direct Cost: ¥6,700,000)
Fiscal Year 1990: ¥800,000 (Direct Cost: ¥800,000)
Fiscal Year 1989: ¥4,900,000 (Direct Cost: ¥4,900,000)
Fiscal Year 1988: ¥1,000,000 (Direct Cost: ¥1,000,000)
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| Keywords | VAR / Ti alloys / Fluid Flow / Natural Convection / Electromagnetic Force / Solidification Analysis / Optimization / 真空アーク再溶解法(VAR) |
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| Research Abstract |
Vacuum Arc Remelting is most popular for the secondary Ti alloy melting. Quality of Ti alloy ingots is determined during solidification process from a high temperature melt heated by the arc discharge.
Prediction of solidification behavior in VAR of Ti alloys is very important to produce sound ingots, because the arc discharge phenomenon and fluid flow are very complex and the basic processes are not fully understood. This research is to numerically calculate the temperature and fluid flow rate distributions and the metal-pool shape, and to provide basic understandings to control the optimum conditions of VAR ingots. In accordance with the magnitude of melting current, there are two regions of occurence of fluid flow dominated by the natural convection and the electromagnetic force. The optimum condition to produce sound ingots exists in the condition that no solid shell forms in the meniscus, fluid flow rate is large and also influenced by the electromagnetic force and the cooling rate is comparatively large.
Predicted and observed values of current and Voltage are very good.
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