| Project/Area Number |
09650104
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Materials/Mechanics of materials
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| Research Institution | Hiroshima University |
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Principal Investigator |
TSUTA Toshio Faculty of Engineering, Hiroshima University, Professor, 工学部, 教授 (80221414)
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| Co-Investigator(Kenkyū-buntansha) |
IWAMOTO Takeshi Faculty of Engineering, Hiroshima University, Assistant, 工学部, 助手 (40274112)
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| Project Period (FY) |
1997 – 1999
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| Project Status |
Completed (Fiscal Year 1999)
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| Budget Amount *help |
¥3,200,000 (Direct Cost: ¥3,200,000)
Fiscal Year 1999: ¥1,500,000 (Direct Cost: ¥1,500,000)
Fiscal Year 1998: ¥700,000 (Direct Cost: ¥700,000)
Fiscal Year 1997: ¥1,000,000 (Direct Cost: ¥1,000,000)
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| Keywords | micro solidification morphology / computer simulation / celluler automation probabilistic approach / magnetic excitation for massy system / equiaxiial crystallization of dendrite / Thermal・Fluid Dynamics Solid・Electro Magnetics・FEM / horizontal casting two roll casting / calculated and experimental morphologies / ミクロ凝固組織 / コンピュータ・シミュレーション / 柱状晶の微細等軸晶化 / 水平連鋳実験 / 双ロール連鋳実験 / 凝固 / ミクロ組織 / セル・オートマトン / 確率論的アプローチ / 電磁加振 / 柱状晶→微細化 / 熱・流体・固体電磁場達成FEM / 核生成-成長 / 2相材 |
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| Research Abstract |
In this paper, an approach to the mathematical modeling of grain structure formation in micro solidification processes is proposed at first. Based on the kinetics of heterogeneous nucleation and of grain growth, the dendrite and the equiaxial micro-morphologies are automatically generated using the Monte-Carlo simulation. Nucleations occurring in the vicinities of vessel wall, vessel corner as well as in the liquid metal are simulated by two steps of calculations using macro- and micro-discretized cell configurations. The growth kinetics of the dendrite tip and the preferential growth directions of cubic metals are taken into account.
The computer system has been developed, and the solidification process and the grow of the associated micro-morphology are solved by varing such parameters as the constitutive undercooling due to the local solute increase in frontal of the solid-liquid interface, compatibility for interference with the adjacent dendritic structure, and macroscopic heat transfer with latent heat discharge.
The grow of morphology in Al-Si binary alloy in 2D region is calculated for numerous conditions of solidification processes and the applicability of the method is clarified.
In the next place it is examine hole the heterogeneous dendritic morphology changes to the equiaxial one due to the fluid dynamic force induced by electromagnetic excitation.
The micro and macro solidification process with or without magnetic stirrer have been solved, and the results are compared with morphologies obtained from actual continuous casting apparatus, such as twin roll casting and horizontal casting and the applicabilities of the method developed arc clarified.
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