Innovative segregation-less large-scale structural steel manufacturing technology combining vacuum cast-in casting and hot forging
Project/Area Number |
16K06818
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Research Category |
Grant-in-Aid for Scientific Research (C)
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Allocation Type | Multi-year Fund |
Section | 一般 |
Research Field |
Metal making/Resorce production engineering
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Research Institution | Akita National College of Technology |
Principal Investigator |
Isobe Kohichi 秋田工業高等専門学校, その他部局等, 教授 (10373929)
|
Project Period (FY) |
2016-04-01 – 2020-03-31
|
Project Status |
Completed (Fiscal Year 2019)
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Budget Amount *help |
¥4,810,000 (Direct Cost: ¥3,700,000、Indirect Cost: ¥1,110,000)
Fiscal Year 2018: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
Fiscal Year 2017: ¥1,950,000 (Direct Cost: ¥1,500,000、Indirect Cost: ¥450,000)
Fiscal Year 2016: ¥2,210,000 (Direct Cost: ¥1,700,000、Indirect Cost: ¥510,000)
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Keywords | 鋳包み / 真空 / 熱間鍛造 / マクロ偏析 / 接合 / 偏析防止 / 造塊法 / 拡散接合 / 溶解 / 凝固 / 真空鋳造 / 鋼塊 / 偏析再現実験 / 大型構造材鋼材製造技術 / 偏析 |
Outline of Final Research Achievements |
As an effective and versatile macro segregation countermeasure in the large ingot making method, a core material having the same composition as the base material is placed in the center of the mold and cast under vacuum and hot forging. The effectiveness of this method was verified by laboratory experiments. In addition, it was clarified that good bonding of the core and the base material can be realized by this method even under the condition where bonding is difficult by the ordinary cast-in-air method. The direct finite difference method was used to analyze the smelting behavior of the core material and the solidification behavior of the molten steel. The segregation formation suppression mechanism of this method and the solidification conditions for suppression were analyzed. The good bonding mechanism and bonding conditions, the cause and countermeasures of the internal crack in the insert casting experiment were clarified.
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Academic Significance and Societal Importance of the Research Achievements |
本法は汎用性と実用性を併せ持つ、極めて有効な世界初の造塊法での偏析防止対策であり、偏析レスで火力発電や原子力発電用の600t超の大型部品や大型反応容器の製造を実現できる。また、各種耐熱鋼や原子炉材料等で偏析分散の為の拡散処理やESR等でのダブルメルトやトリプルメルトの適用が不要となり、大幅なエネルギー消費量やCO2排出量の削減と製造コストの大幅な低減も可能となる。マクロ偏析による材質劣化の解消により部品の一層の大型化や高温発電等で熱効率や発電効率は大幅に改善でき、エネルギー消費量やCO2排出量を大幅に削減するなど、本技術は革新的構造材料創出とグリーンイノベーションの進展に大きく貢献する。
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Report
(5 results)
Research Products
(7 results)