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研究生:張芷旖
研究生(外文):Jhih-Yi Jhang
論文名稱:不同熱處理溫度條件對單方向凝固CM-681LC鎳基超合金之微結構及高溫潛變之影響
論文名稱(外文):Effects of Different Heat Treatment Temperatures on Microstructure and High-Temperature Creep of Directionally Solidified CM-681LC Ni-Based Superalloy
指導教授:簡賸瑞
指導教授(外文):Sheng-Rui Jian
學位類別:碩士
校院名稱:義守大學
系所名稱:材料科學與工程學系
學門:工程學門
學類:材料工程學類
論文種類:學術論文
論文出版年:2017
畢業學年度:105
語文別:中文
論文頁數:91
中文關鍵詞:CM-681 LC鎳基超合金單方向凝固熱處理高溫潛變差排
外文關鍵詞:CM-681LC superalloydirectionally solidificationheat treatmentcreepdislocation
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本研究採用CM-681LC鎳基超合金為材料基礎。一開始先將試棒進行單方向凝固製程,條件為:180mm/hr、溫度1550℃,使試棒鑄造成為單方向晶的試棒。而後使用不同的熱處理製程進行實驗,本研究有兩種熱處理條件,其一是規範所給的條件,為HT1;另一為使用示差掃描量熱儀(Differential Scanning Calorimetry,DSC)所取的條件,為HT2。HT1:固溶溫度1185℃/4hr/ArC,搭配第一次時效1038℃/2hr和第二次時效870℃/20hr/ArC;HT2:固溶溫度1270℃/4hr/ArC,搭配第一次時效1038℃/2hr和第二次時效870℃/20hr/ArC,只有固溶熱處溫度不同,第一次時效熱處理以及第二次時效熱處理是相同的。探討兩者之間微結構的不同與高溫潛變的不同。本實驗透過掃描式電子顯微鏡(Scanning Electron Microscopy, SEM)、能量散射光譜儀(Energy Dispersive Spectrometer,EDS)和穿透式電子顯微鏡(Translation Electron Microscopy,TEM)等方式進行微觀組織的觀察。機械性質潛變測試之測試條件為1050℃/200MPa,屬於超高溫低應力之潛變測試。研究結果顯示,HT2因為其γˊ相因為熱處理程序較佳,使得γˊ相體積分率比HT1大與γ channel寬度也比HT1窄,因此潛變測試過程中差排不易移動,使CM-681 LC的機械性質增加。
In this study, CM-681LC nickel-based superalloy was selected as the base material with two solution heat treatment temperatures, HT1: 1185℃ for 4hr with Argon cooling to the ambient temperature, which is according to the Cannon-Muskegon Co. Technical Bulletin; HT2: 1270℃ for 4hr with Argon cooling, which is based upon Differential Scanning Calorimetry results. The aging heat treatment has two steps; the first aging is at 1038℃ for 2hr with Argon cooling followed by the second aging temperature at 870℃ for 20hr with Argon cooling. Directionally solidified round bar specimens were produced by typical Bridgeman type casting furnace. Microscopic observations were carried out by Scanning Electron Microscopy with Energy Dispersive Spectrometer and Transmitted Microscopy. Creep tests at 1050℃ and 200MPa were conducted by ATS level arm creep tester. Creep rupture life of HT1 and HT2 is 43 and 64 hours, respectively. Since HT2 produces uniformly distributed cuboidal γ'' precipitates with 0.29 µm average size and 84.5% volume fraction, the γ channel width is 9.15 nm, which is narrower than that of HT1 10.26 nm. Uniformly distributed γ′ precipitates and narrower γ channel width could result in higher Orowan bowing shear stress, which might have efficiently stuck the dislocation motions across the precipitates; consequently, creep rupture life of HT2 is 21 hours overrun at the ultra-high temperature regime.
中文摘要 ............................................................................................................. I
英文摘要 .......................................................................................................... III
誌 謝 .............................................................................................................. IV
總目錄 ............................................................................................................ V
表目錄 ........................................................................................................ VIII
圖目錄 ........................................................................................................... IX
第一章 緒論及研究動機 ............................................................................. 1
1-1 緒論 ..................................................................................................... 1
1-2 研究動機 ............................................................................................. 3
第二章 原理與文獻回顧 .................................................................................. 8
2-1 超合金種類 .......................................................................................... 8
2-1-1 CM-681LC 超合金簡介 ........................................................ 9
2-1-2 CM-681LC 超合金元素及其影響 ........................................ 9
2-2 單方向凝固鑄造理論 ........................................................................ 11
2-2-1 合金凝固的型態 .................................................................. 12
2-3 鎳基超合金的顯微結構 ................................................................... 12
2-3-1 基材γ 相(Alloy Matrix Gamma)......................................... 13
2-3-2 γˊ相(Gamma Prime) ............................................................. 13
2-3-3 γ-γˊ共晶相............................................................................ 14
2-3-4 碳化物(Carbides) ................................................................. 14
2-4 熱處理對鎳基超合金之影響 ........................................................... 16
2-4-1 固溶熱處理對鎳基超合金之影響 ........................................ 16
2-4-2 時效熱處理對鎳基超合金之影響 ........................................ 16
2-5 潛變理論與鎳基超合金之關係 ....................................................... 17
2-5-1 潛變定義 ................................................................................ 17
2-5-2 潛變機制 ................................................................................ 17
2-5-3 潛變基礎理論 ........................................................................ 18
第三章 實驗方法 ............................................................................................ 31
3-1 實驗設計 ........................................................................................... 31
3-2 實驗材料 ........................................................................................... 31
3-3 真空熔煉單方向晶鑄造製成 ............................................................ 31
3-4 背向散射電子繞射(EBSD)晶粒方位分析 ...................................... 32
3-5 熱重性質分析 ................................................................................... 32
3-6 單方向晶CM-681 LC 熱處理參數設計 ......................................... 33
3-7 掃描電子顯微鏡(SEM)試片製備及觀察 ........................................ 34
3-8 電子微探針(EPMA)成分散佈分析 ................................................. 34
3-9 潛變測試 ........................................................................................... 35
3-10 穿透式電子顯微鏡(TEM)試片製備及觀察 .................................. 36
第四章 結果與討論 ........................................................................................ 50
4-1 單方向凝固(DS)試棒巨觀觀察 ....................................................... 50
4-2 EBSD 晶粒成長方位分析 .............................................................. 50
4-3 EPMA 元素分布分析 ..................................................................... 51
4-4 熱處理後微觀組織觀察 ................................................................... 51
4-4-1 固溶熱處理 ............................................................................. 52
4-4-2 固溶熱處理+第一次時效熱處理 ......................................... 53
4-4-3 固溶熱處理+雙時效熱處理(第一次與第二次) ................... 53
4-5 潛變試驗 ........................................................................................... 55
4-5-1 潛變曲線數據分析 ................................................................ 55
4-5-2 破斷面巨觀觀察及微觀組織觀察 ........................................ 56
4-5-3 潛變後TEM 觀察差排機制 ................................................. 56
第五章 結論 .................................................................................................... 71
第六章 參考文獻 ............................................................................................ 73
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