臺灣博碩士論文加值系統

本研究使用直立式管狀高溫實驗爐，在1600℃的高溫下重新熔融Rene 77鎳基超合金，並以高速拔引凝固（HRS）製程製作單方向凝固試材。拔引過程當中，實際測量鑄件的溫度變化，並將溫度數據擷取，進行鑄件凝固溫度梯度分析。對於單方向凝固之數值模擬，首先以SolidWorks建立幾何形狀，網格由GEOMESH自動生成配置，再由ProCAST鑄造軟體進行電腦輔助分析。數值模擬的過程中，將單方向凝固實驗所量測之溫度，作為輸入溫度之邊界條件。鑄造分析的結果分別從巨觀和微觀的方式下探討。巨觀方面，計算之凝固溫度分布和凝固方向的觀察與高速拔引凝固製程產生的溫度分布與凝固方向與吻合。微觀方面，採用CAFE模式並輸入晶粒形核模式相關參數，模擬Rene 77超合金單方向凝固後的內部組織及觀察晶粒形態。

In this study, the vertical cylindrical Bridgman furnace was used to melt Rene 77 nickel-based superalloys at 1600°C and to fabricate the DS test bars by high rate solidification (HRS) process. During the withdraw process, temperature changes of the test bar were measured and recorded for further temperature gradient analysis. As the numerical simulation of the directional solidification process, geometry shapes were firstly established by SolidWoks, and then automatically meshed by GEOMESH, finally analyzed by the CAE software ProCAST. During the numerical simulation of the directional solidification, measured temperatures were implemented as the boundary conditions. There are two ways to confirm the casting analyses, namely, macroscopic and microscopic. Macroscopically, the calculated temperature distribution and solidification direction of the directionally solidified casting coincide with these in the real HRS process. Microscopically, by the use of CAFE model with related grain nucleation parameters, the micro-structure and the grain morphology of the directionally solidified Rene 77 superalloy were simulated and observed.

摘 要I
AbstractII
誌謝III
總目錄V
圖目錄VII
表目錄IX
第一章 緒論1
1.1前言1
1.2文獻回顧3
1.3研究動機和研究內容4
第二章 研究理論9
2.1熱傳原理9
2.1.1單方向凝固熱傳原理10
2.1.2固-液界面的產生12
2.1.3凝固潛熱現象13
2.2單方向凝固原理13
2.2.1樹枝狀晶成長14
2.3單方向凝固鑄造15
第三章 實驗步驟及模擬流程25
3.1實驗材料25
3.2單方向凝固實驗爐25
3.3試棒溫度量測步驟26
3.4 模擬流程27
3.4.1 幾何形狀建立27
3.4.2 幾何模型網格化27
3.4.3模型條件假設27
3.4.4 材料熱物性性質28
3.4.5邊界條件及介面熱傳係數設定28
3.4.6鑄造方式和微觀參數設定28
第四章 實驗結果與數值模擬分析48
4.1單方向凝固爐實驗數據48
4.1.1氧化鋁空管溫度48
4.1.2超合金試棒初始溫度48
4.1.3試棒固-液界面形成決定49
4.1.4單方向凝固溫度變化量測49
4.2數值模擬結果分析49
4.2.1鑄件之溫度場變化50
4.2.2鑄件之固相率變化50
4.2.3鑄件於單方向凝固熱傳分佈50
4.3數值模擬結果之溫度梯度51
第五章 結論64
參考文獻65

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