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研究生:谷中華
研究生(外文):KU,CHUNG HUA
論文名稱:熱處理對Ti-15V-3Cr-3Sn-3Al合金電子束銲接製程微結構與表面性質之影響
指導教授:王 樂 民
學位類別:碩士
校院名稱:國防大學中正理工學院
系所名稱:兵器系統工程研究所
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:2008
畢業學年度:96
語文別:中文
論文頁數:115
中文關鍵詞:鈦-15釩-3鉻-3錫-3鋁合金穿透式顯微鏡
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本論文主要在探討Ti-15V-3Cr-3Sn-3Al合金以電子束銲接(Electron Beam Welding, EBW)製程,經由以不同條件之熱處理,對其銲道機械性質、微觀結構進行分析探討。另在不同條件之熱處理後,分別於銲件熔融區、熱影響區及母材區進行微觀組織分析其氧化層成份及電化學性質測試,研究顯示,Al2O3及TiO2氧化物會存在於本研究使用之熱處理後各區域之表面氧化層,本文並探討其與耐蝕之關係。本研究另發現,銲件經電子束銲接後施以應力消除(SR/650℃/30min/氣冷)之熔融區,有TiCr2化合物產生。
This thesis studies influences of various post-weld heat treatments (PWHT) on the microstructures and its corresponding mechanical and the corrosion resistance of the Ti-15V-3Cr-3Sn-3Al weldment by electron beam welding(EBW) process. To do this, base metal (BM), fusion zone (FZ) and heat affected zone(HAZ) of EBW process are investigated. It appears that Al2O3 and TiO2 are found in surface layer under corresponding heat treatment condition. The correlation of produced oxide layers after heat treatment and their corrosion resistance is discussed. Furthermore, for the weldment with a PWHT of stress relieve at 650C for 0.5 hours then air cooling, the TiCr2 metallic compound was firstly found to precipitate in the fusion zone.
目錄

誌謝 ii
摘要 iii
ABSTRACT iv
目錄 v
表目錄 viii
圖目錄 ix
符號說明 xiii
1. 前言 1
2. 文獻回顧 2
2.1 鈦及鈦合金的基本簡介 2
2.2 合金元素分類 2
2.3 鈦合金的種類 3
2.4 Ti-15V-3Cr合金 4
2.5 熱處理的機制 5
2.5.1 固溶處理+時效處理 5
2.5.2 熱機處理 6
2.5.3 麻田散體(Martensite) 7
2.5.4 介金屬化合物, TiCr2 7
2.6 鈦合金的銲接性 9
2.7 電子束銲接 10
2.7.1 電子束銲接的原理 11
2.7.2 電子束銲接的機制 11
2.7.3 電子束銲接的優缺點 11
2.7.4 電子束銲道之凝固現象 12
2.8 鈦合金之腐蝕特性 13
3. 實驗步驟與方法 25
3.1 實驗材料 25
3.2 實驗規劃 25
3.3 穿透式電子顯微鏡(TEM)觀察 25
3.4 掃描式電子顯微鏡(SEM)觀察 26
3.5 化學分析電子儀(ESCA)檢測 26
3.6 X光繞射儀(XRD) 26
3.7 電化學極化試驗 26
4. 結果與討論 35
4.1 微結構分析(HRTEM) 35
4.2 腐蝕測試分析 38
4.2.1 不同熱處理條件之腐蝕特性 38
4.2.1.1母材(Base Metal) 38
4.2.1.2 熔融區(FZ) /熱影響區(HAZ) 39
4.2.2 熱處理後之耐腐蝕性質 41
4.2.2.1 X-Ray繞射 41
4.2.2.2 化學分析電子儀(ESCA)的檢測 41
4.2.2.3 掃描式電子顯微鏡觀察 42
4.2.2.4 腐蝕測試 42
5. 結論 115
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