Development at temperature mrasurment system and solidification microstructure control under rapid solidification condition

温度测量系统开发及快速凝固条件下凝固组织控制

• 批准号: 05452298
• 负责人: UMEDA Takateru
• 金额: $ 4.29万
• 依托单位: The University of Tokyo
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (B)
• 财政年份: 1993
• 资助国家: 日本
• 起止时间: 1993 至 1994
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-05452298/
• 关键词: rapid solidification; phase selection; rapidly solidified powders; modeling; Nd-Fe-B magets; デンドライト成長; 熱デンドライト; Nd-Fe-B; 光温度計測; 形態選択; 18-8ステンレス鋼; 準安定γ相

Rapid solidification processing is expected to develop new near net shape methods and to bring out new functional properties by making fine structures, supersaturation, metastableand amorphous phases. To develop further rapid solidification processing, it is necessary to under stand deeply rapid solidification phenomenaby introducing appropriate measuring methods and also to simulate phenomena. This research is aimed 1) to predict quantitatively morphology and phase selection, and segregation, 2) to make clear a guide line to develop the rapid solidification processing of structural and also magnetic materials. Results obtained are as follows ;1) Morphology and phase selection are established, especially for alloys with peretectic reactions.2) Solidification of rapidly solidified powders is simulated under the conditions of undercooling, diameter of powders and heat transfer between ambientgas and powders.3) Crystal growth model is developed by incorporating empirical nucleationequations occurred between in got and mold surfaces.4) Phase selection is modeled for Nd-Fe-B magnets. The condition of producing primary phase Nd_2Fe_<14>B is established controlling solidification rate and initial composition.5) Solidfication path is established for Nd-Fe-B magnets. The amount of Nd_2Fe_<14>B and boundary phases can be predicted.

预计快速固化处理将开发新的近净形状方法，并通过制造精细的结构，过饱和，转移性非晶相。为了开发进一步的快速凝固处理，必须在深度快速固化现象下引入适当的测量方法并模拟现象。这项研究的目的是1）预测定量形态学和相位选择，以及隔离，2）制定一个指导线，以开发结构和磁性材料的快速固化处理。所获得的结果如下：1）建立形态和相位选择，尤其是对于具有过型反应的合金的形态和相位选择。2）固化迅速固化的粉末在较不过冷的条件下，粉末直径，直径和热传递的条件进行模拟。 ND-FE-B磁铁。建立了控制固化速率和初始组成的主要相位ND_2FE_ <14> B的条件。5）为ND-FE-B磁体建立固体缺陷路径。可以预测ND_2FE_ <14> B和边界阶段的量。

项目成果

梅田 高照: "凝固現象の基礎" 社団法人 日本鉄鋼協会, 294 (1994)

Takateru Umeda：“凝固现象的基础”日本钢铁研究所，294 (1994)

S.G.Kim: "Microstructural evolution in a rapidly solidified Al-4mass%Fe droplet" Materials Science and Engineering. A181/A182. 1156-1160 (1994)

S.G.Kim：“快速凝固的 Al-4mass 液滴中的微观结构演化”材料科学与工程。

梅田 高照: "包晶反応を有する合金の晶出相に及ぼす凝固速度の影響" 材料とプロセス No.1. 7. (1994)

Takateru Umeda：“凝固速率对包晶反应合金结晶相的影响”Materials and Processes No. 1. 7. (1994)

W.Kurz: "Phase and Microstructure Selection During Growth of Peritectic Systems" Proc.Japan-US Seminar on Solidification Processing for the 21st Century. 1-11 (1994)

W.Kurz：“包晶系统生长过程中的相和微观结构选择”Proc.日美21世纪凝固加工研讨会。

T.Umeda: "Fundamentals of Solidification in Slab Casting" The 153 154th Nishiyama Memorial Seminar. 45-88 (1994)

T.Umeda：“板坯铸造凝固基础”第153-154届西山纪念研讨会。