臺灣博碩士論文加值系統

Ti-15-3（Ti-15V-3Cr-3Sn-3Al）板材為當前高強度的準穩定β鈦合金，本文藉由不同熱處理方式來探討其高溫潛變性質及微觀結構的變化，結果顯示Ti-15-3板材經由熱處理後，810°C固溶處理1小時＋爐冷/538°C時效處理8小時氣冷除可有效提升室溫下機械性質，且可提升在高溫下抗潛變性質；且經潛變後TiAl、Ti3Al及TiCr2奈米尺寸的介金屬化合物在晶粒中出現。本文並探討相關工業用熱處理對提升潛變及微觀結構的影響。

In this thesis, several industrial heat treatments were employed on Ti-15-3 alloy to investigate their effect on following creep properties as well as the microstructure evolution. It was found that solution treatment at 810℃/1hr + furnace cool at 538℃/8hr＋air cool can not only increase the mechanical property but may also enhance the creep property of Ti-15-3 alloy. After creep test at 520MPa, 500℃, the intermetallics of TiAl, Ti3Al and TiCr2 were found. The effect of industrial heat treatments on creep property of Ti-15-3 is discussed.

誌謝 i
摘要 iii
ABSTRACT iv
目錄 v
表目錄 vii
圖目錄 viii
1.前言（簡介） 1
2.文獻回顧 2
2.1鈦及鈦合金之發展 2
2.2鈦及鈦合金的分類 3
2.2.1 α鈦合金 4
2.2.2 近α鈦合金 4
2.2.3 α＋β鈦合金 5
2.2.4 準穩定β鈦合金 5
2.3鈦合金的熱處理 6
2.4 添加合金元素對鈦合金之影響 8
2.5 鈦合金的介金屬化合物 10
2.6潛變 11
2.6.1 潛變性質 12
2.6.2 潛變變形的機構 12
2.6.3 Ti-15V-3Cr-3Sn-3Al合金潛變 14
3.實驗方法及步驟 36
3.1 實驗規劃 36
3.2 實驗材料及前處理 36
3.3 熱處理程序 36
3.4 潛變實驗 36
3.5 潛變試片製作 37
3.6 光學顯微鏡觀察 37
3.7 掃描式電子顯微鏡觀察 37
3.8 穿透式電子顯微鏡觀察 38
4.結果與討論 47
4.1 TI-15-3機械特質 47
4.2 潛變性質 47
4.3 微觀結構分析 48
5.結論 73
6.參考文獻 74
自傳 80

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