臺灣博碩士論文加值系統

本研究是探討在大氣及腐蝕環境中，軸向負荷對英高鎳600TT合金管件上圓周向裂縫成長行為之影響，以作為蒸汽產生器熱交換管件壽命評估之依據。
研究結果發現；在大氣環境下，軸向固定負荷未造成英高鎳600TT合金管上之圓周向裂縫成長。動態極化曲線掃描顯示在低於1M硫代硫酸鈉濃度之溶液中並沒有明顯的鈍化區，但在1%硝酸溶液及40%和10%氫氧化鈉溶液中有明顯的鈍化區存在。在1M硫代硫酸鈉溶液及外加300mV電位之腐蝕環境中，經160小時裂縫並未成長。然在20%硝酸及外加5mA直流電流溶液中，裂縫成長速率隨軸向負荷之增加而增快，發生典型之沿晶應力腐蝕斷裂，且得到軸向負荷(P)與裂縫深度由0.2mm成長至0.4mm之時間(t0.4)之關係為 。在本研究之實驗條件下，應力強度因子約為9.6∼16.9Mpa*m1/2，裂縫成長速率為1.3∼4.4µm/hr.。

The objective of the study is to investigate crack growth behavior of Inconel 600TT alloy tubes with circumferential pre-cracks and under axial load in ambient and corrosive environment. The study results provide the prediction on the lifetime of Inconel 600TT alloy tubes.
Under constant axial load and non-corrosive environment, there was no circumferential crack growth observed in Inconel 600TT alloy tubes. At 25℃, scanning curves of potentiodynamic polarization measurement reveal passive region showed up in NaOH and HNO3 solution, instead of less than 1M Na2S2O4 solution. Crack growth did not happen in the corrosive conditions of 1M Na2S2O4 solution with 300mV potential. However, crack growth rate increased by axial load in the solution of 20% HNO3 and 5mA DC. Typical intergranular stress corrosion cracking (IGSCC) occurred in the relation of as crack grew from 0.2 mm to 0.4 mm in the depth. In the conditions of experiment, the stress intensive factor are from 9.6∼16.9Mpa*m1/2 and the crack growth rates are in the range from 1.3 to 4.4µm/hr.

誌謝 ii
摘要 iii
ABSTRACT iv
目錄 v
表錄 viii
圖錄 ix
1. 緒論 1
1.1 前言 1
1.2 研究動機 6
1.3 研究方法 8
2. 文獻回顧 10
2.1 蒸汽產生器熱交換管的劣化肇因及機制 10
2.2 核三廠蒸汽產生器熱交換管之壓力及溫度分佈 11
2.3 殘留應力之估算 12
2.4 腐蝕因子 13
2.5 裂縫成長速率之量測 16
3. 實驗 19
3.1 實驗設計及準備 19
3.1.1試樣材料性質及設計 19
3.1.2拉伸強度測試 21
3.1.3試樣設計及尺寸 23
3.2 實驗系統組裝 23
3.2.1定負荷機台及校正 24
3.2.2往復式直流電量測系統 27
3.2.3腐蝕環境 29
3.3 實驗程序 31
3.3.1未加腐蝕環境之定負荷試驗 31
3.3.2極化曲線量測 32
3.3.3腐蝕環境下之定負荷試驗 32
4. 結果與討論 33
4.1 未加腐蝕環境之裂縫成長 33
4.2 適當的腐蝕環境 43
4.2.1硫代硫酸鈉的極化曲線 43
4.2.2硝酸的極化曲線 45
4.2.3氫氧化鈉的極化曲線 47
4.3 腐蝕環境下之定負荷試驗 50
4.3.1在1M硫代硫酸鈉中之定負荷試驗 50
4.3.2在20%硝酸中之定負荷試驗 53
4.4 軸向負荷對英高鎳600TT合金圓周向裂縫成長之影響 66
4.5 腐蝕環境對英高鎳600TT合金圓周向裂縫成長之影響 67
5. 結論與未來研究方向 69
5.1 結論 69
5.2 未來研究方向 70
參考文獻 72
附錄A 79
附錄B 80
附錄C 81
附錄D 82
自傳 83

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