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系統識別號 U0026-0408201218293900
論文名稱(中文) 鎳基690合金於低溫高速荷載下之動態塑變行為與顯微結構分析
論文名稱(英文) Dynamic Plastic Deformation Behaviour and Microstructural Characteristics of Inconel 690 Alloy Subjected to Low Temperature and High Strain Rate Loading Conditions
校院名稱 成功大學
系所名稱(中) 機械工程學系碩博士班
系所名稱(英) Department of Mechanical Engineering
學年度 100
學期 2
出版年 101
研究生(中文) 許銘家
研究生(英文) Ming-Chia Hsu
學號 n16991619
學位類別 碩士
語文別 中文
論文頁數 124頁
口試委員 指導教授-李偉賢
口試委員-黃永茂
口試委員-王俊志
中文關鍵字 霍普金森桿  Inconel 690超合金  低溫  應變速率  絕熱剪切帶  差排 
英文關鍵字 split-Hopkinson bar  Inconel 690 super alloy  cryogenic temperature  strain rate  adiabatic band  dislocation 
學科別分類
中文摘要 本論文主要是使用霍普金森高速撞擊試驗機及低溫裝置,於不同溫度和高應變速率荷載下測試Inconel 690合金之塑性變形行為下的機械性質及微觀結構變化。實驗溫度分別為-150℃、0℃、25℃;應變速率為2000 /s、4000 /s和6000 /s,以了解溫度及應變速率對材料塑變行為及微觀結構之影響。
實驗結果顯示,溫度和應變速率對Inconel 690合金之機械性質影響甚鉅。在相同溫度條件下,其塑流應力值、加工硬化率及應變速率敏感性係數均會隨應變速率之增加而上升,而熱活化體積則會下降。相反地,在相同應變速率條件下,其塑流應力值、加工硬化率與應變速率敏感性係數則會隨溫度之增加而下降,而熱活化體積則會上升。此外,可以藉由Zerilli-Armstrong構成方程式,來精確的預測此合金在不同溫度及應變速率下的塑變行為。
在微觀方面,由光學顯微鏡之觀測可知Inconel 690合金中有絕熱剪切帶形成及晶粒組織形貌的改變,兩者皆受溫度與應變速率的影響;而剪切帶中之裂縫生成與結合,為導致材料發生破壞的主要原因。在掃描式電子顯微鏡分析下,破壞形貌中可發現韌窩組織,表示Inconel 690合金屬於延性破壞模式,且其韌窩組織隨著溫度和應變速率的增加而變得較密且深。而在穿透式電子顯微鏡下則可觀測到差排密度隨著應變速率上升而增加,且可發現滑移帶的產生。最後結合巨觀與微觀結果證明了差排密度、塑流應力值、應變速率敏感性係數及熱活化體積有重要的相關性。
英文摘要 This study uses a split-Hopkinson bar and cryogenic devices to investigate the impact deformation behavior, fracture response and dislocation substructure of Inconel 690 super alloy at different temperatures of 25℃, 0℃and -150℃ under strain rates of 2000 /s, 4000 /s and 6000 /s, respectively.
The experimental results indicate that the mechanical properties are related to temperatureandstrain rate. At a constant temperature, plastic stress, work hardening, strain rate sensitivity all increase with the increasing strain rate, while the thermal activation volume decreases. However, at a constant strain rate, plastic stress, work hardening rate and strain rate sensitivity decrease with increasing temperature, while the thermal activation volume increases. In addation, the observed impact deformation behavior of this alloy under current testing conditions can be described by the Zerilli-Armstrong equation.
Optical microstructural observations reveal that the formation of adiabatic shear band and morphology of deformed grain of Inconel 690 super alloy both affected by temperature and strain rate. The SEM fracture analysis results indicate that the Inconel 690 specimens fail predominantly as the result of intensive localized shearing. The fracture surfaces of the deformed specimens are characterised by a dimple structure. The density of dimples increases with increasing strain rate and temperature.Transmission electron microscopy (TEM) observations show that the dislocation density increases with increasing strain rate, but decreases with increasing temperature.The relationship between the dislocation density and flow stress can be described by the Bailey-Hirsch type relation. Finally, the flow stress, strain rate sensitivity and thermal activation volume are related to the observeddislocation substructure.
論文目次 中文摘要 I
ABSTRACT II
誌謝 IV
總目錄 V
表目錄 IX
圖目錄 XI
符號說明 XVIII
第一章 前言 1
第二章 理論與文獻回顧 3
2-1 鎳基合金之介紹 3
2-1-1 鎳基合金的分類 3
2-1-2 鎳基合金的強化機構 4
2-1-3 鎳基合金於工業上的應用 5
2-2 Inconel 690合金 5
2-2-1 物理性質 6
2-2-2 機械性質 6
2-2-3 冶金安定性 7
2-2-4 熱處理與析出機構 7
2-2-5 抗腐蝕性 8
2-2-6 製造加工特性 10
2-3 塑性變形之機械測試類別 10
2-4 一維波傳理論 12
2-5 霍普金森桿原理 14
2-6 材料塑性變形行為之特性 16
2-7 材料構成方程式 19
第三章 實驗方法與步驟 38
3-1 實驗流程 38
3-2 實驗儀器與設備 38
3-2-1 霍普金森動態撞擊試驗機 38
3-2-2 訊號處理裝置 39
3-2-4 鑽石刀片切割機 40
3-2-5 雙噴射式電解拋光機 40
3-2-6 光學顯微鏡(OM) 40
3-2-7 掃描式電子顯微鏡(SEM) 40
3-2-8 穿透式電子顯微鏡(TEM) 41
3-3 實驗步驟 41
3-3-1 實驗材料試件製備 41
3-3-2 動態撞擊實驗 42
3-3-2 OM金相觀察 43
3-3-3 TEM試片製備 43
第四章 實驗結果與討論 47
4-1 應力-應變曲線 47
4-2 加工硬化率 47
4-3 應變速率敏感性係數 49
4-4 熱活化體積 50
4-5 活化能 52
4-6 溫度敏感性係數 53
4-7 理論溫升量 54
4-8 材料構成方程式 55
4-9 OM金相組織觀察 56
4-10 SEM破壞特徵分析 57
4-11 TEM差排結構特徵 58
第五章 結論 118
參考文獻 121
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