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研究生:陳哲皜
研究生(外文):Chen, Che-Hao
論文名稱:熱置氫製程對Ti-6Al-4V合金相變化及抗蝕性能之影響
論文名稱(外文):The Effect of Thermal Hydrogenation Processing on Phase Transformations and Corrosion Resistance of Ti-6Al-4V Alloy
指導教授:王樂民王樂民引用關係
指導教授(外文):Wang, Le-Min
口試委員:鄧世剛黃銘賢許進明沈家傑
口試委員(外文):Teng, Shih-KangHuang, Ming-HsienHsu, Cjin-MingShen, Chia-Chieh
口試日期:2013-05-09
學位類別:碩士
校院名稱:國防大學理工學院
系所名稱:兵器系統工程碩士班
學門:軍警國防安全學門
學類:軍事學類
論文種類:學術論文
論文出版年:2013
畢業學年度:101
語文別:中文
論文頁數:97
中文關鍵詞:Ti-6Al-4V熱置氫製程微觀結構抗蝕性
外文關鍵詞:Ti-6Al-4VTHPMicrostructureCorrosion Resistance
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摘要

本研究探討Ti-6Al-4V合金經β固溶處理後(1050℃/30min/FC)在600℃的溫度下以不同吸放氫量(0.1、0.3、0.5、0.6、0.7及0.9 H/M,※H/M表示儲放氫過程吸氫量與鈦合金原子的莫耳數比)的條件下進行熱置氫製程(Thermal Hydrogenation Processing, THP)後,在室溫中探討微觀結構、硬度、試片表面之氧化模與抗腐蝕性之關係。
實驗結果顯示增加熱置氫製程的儲放氫量,可以使晶粒細化,經此製程後,觀察到細化之α相由α與無明確晶型區域(Ill-Defined)組成,β相亦之相同,此二相皆出現於α/α、α/β晶界間,其中新析出的α2-Ti3Al介金屬化合物亦以近似方式析出,使Ti-6-4合金原α及β相基材增加晶界。而本論文依熱置氫製程氫含量的變化影響結構及產生的無明確晶型區域機制進行討論。

ABSTRACT

This study aims to investigate the correlation of hydrogen loading, microstructural evolution, phase transformation, hardness and corrosion resistance of β solution treated (1050℃/30min/FC) Ti-6Al-4V alloy following thermal hydrogenation processing (THP) at 600℃under related hydrogen loading (0.1, 0.3, 0.5, 0.6, 0.7 and 0.9 H/M, *H/M indicating the ratio of hydrogen to Ti-6-4 atoms during THP).
It appears that the grain refinement can be readily achieved by enhanced H/M value of THP. It appears that the refined α phase is actually composed of α and ill defined area within α, so are the β phase being composed of ill defined area with β phase after THP process. As a result, the outer original larger grain boundary still remains associated with many cut and isolated α, β phases containing ill defined regines as a boundary of α or β phase .Furthermore, The newly formed α2-Ti3Al can play the similar role to isolate the original α or β phase than producing more interfaces in Ti-6-4 matrix. The mechanism of ill defined area formation and the influence the content of hydrogen during THP on microstructure evolution are discussed.

目錄
致謝 ....................................................................................................... ii
摘要 ...................................................................................................... iii
ABSTRACT .................................................................................................. iv
目錄 ........................................................................................................ v
表目錄 .................................................................................................... vii
圖目錄 ..................................................................................................... ix
縮寫和符號說明 .............................................................................................. xii
1. 前言 ..................................................................................................... 1
2. 文獻回顧 .................................................................................................. 2
2.1 鈦與鈦合金 ............................................................................................... 2
2.2 鈦合金基本介紹 ............................................................................................ 3
2.3 Ti-6Al-4V合金 ........................................................................................... 4
2.3.1 微觀結構 ............................................................................................... 4
2.3.2 腐蝕行為 ............................................................................................... 5
2.3.3 微觀結構對抗蝕能力影響 .................................................................................... 6
2.4 氫處理技術 ............................................................................................... 6
2.4.1 氫的特性 ............................................................................................... 7
2.4.2 鈦合金氫化處理 .......................................................................................... 7
2.4.3 熱置氫製程 ............................................................................................. 8
3. 實驗方法 ................................................................................................. 23
3.1 實驗材料 ................................................................................................ 23
3.2 實驗規劃 ................................................................................................ 23
3.3 氫化處理 ................................................................................................ 24
3.4 吸放氫動力曲線量測 ........................................................................................ 24
3.5 實驗介紹 ................................................................................................ 25
3.5.1 X射線繞射分析儀 ........................................................................................ 26
3.5.2 微觀結構觀察 ........................................................................................... 26
3.5.3 微硬度試驗 ............................................................................................. 26
3.5.4 高解析穿透式電子顯微鏡 ................................................................................... 26
3.5.5 氧化膜成份分析 .......................................................................................... 27
3.5.6 極化實驗量測 ........................................................................................... 27
4. 結果與討論 ................................................................................................ 37
4.1 微觀結構觀察 ............................................................................................. 37
4.2 X射線繞射儀(XRD)分析結果 .................................................................................. 38
4.3 微硬度測試 .............................................................................................. 40
4.4 高解析穿透式電子顯微鏡(HRTEM)觀察結果 ....................................................................... 40
4.5 氧化膜橫截面探討 ......................................................................................... 43
4.6 化學分析電子能譜儀(ESCA)分析結果 ........................................................................... 44
4.6.1 氧化膜之Ti元素氧化型態分析 ............................................................................... 44
4.6.2 氧化膜之Al元素氧化型態分析 ............................................................................... 44
4.7 極化試驗結果 ............................................................................................. 45
5. 結論 ..................................................................................................... 88
參考文獻 ..................................................................................................... 91
自傳 ........................................................................................................ 97
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