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研究生：	楊鎮豪 Yang, Chen-Hao
論文名稱：	鎳基182合金銲道於硫酸溶液中之應力腐蝕破裂行為 Stress Corrosion Cracking of Alloy 182 Weld in H2SO4 Solution
指導教授：	蔡文達 Tsai, Wen-Ta
學位類別：	碩士 Master
系所名稱：	工學院 - 材料科學及工程學系 Department of Materials Science and Engineering
論文出版年：	2006
畢業學年度：	94
語文別：	中文
論文頁數：	82
中文關鍵詞：	鎳基182合金、控制電位、硫酸、應變速率、應力腐蝕破裂(SCC) 、慢應變速率拉伸試驗(SSRT)
外文關鍵詞：	applied potential, strain rate, H2SO4, Alloy 182, slow strain rate test
相關次數：	點閱：91 下載：2
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摘要
本研究主要針對鎳基182合金銲道在常溫、常壓下，於空氣和硫酸溶液等環境中進行拉伸試驗，並對其微觀組織、敏化程度以及應力腐蝕破裂(stress corrosion cracking, SCC)行為進行探討。所探討的因素包括控制電位、應變速率、熱處理條件以及添加劑硫代乙醯胺(CH3CSNH2)之影響。
由SSRT結果顯示，未經熱處理(as-weld, AW)之鎳基182合金銲道於0.05M硫酸溶液中，控制在不同電位下，以應變速率8.3×10-7 s-1進行拉伸之試驗中，以活性轉鈍性的電位範圍下(-85及-150 mVSCE)具有較高之SCC敏感性。而於0.05M硫酸溶液中，在控制電位為-85 mVSCE下，以不同應變速率進行拉伸之試驗中，其SCC破裂敏感性隨著應變拉伸速率8.3×10-6s-1降低至8.3×10-8 s-1而提升。
由空氣中拉伸結果顯示，經消除應力(stress-relief, SR)處理之試片可能由於析出物的產生，形成析出硬化機制，而使得降伏強度(yielding stress, σy)和UTS略有提升，而經固溶(solution annealing, SA)處理之試片則是略微下降。而在0.05M硫酸溶液中，控制電位為-85 mVSCE下，以應變速率8.3×10-7 s-1進行拉伸之試驗顯示，經SR處理之試片具有較高之SCC敏感性，而經SA處理之試片則較無SCC敏感性。
由動電位極化試驗結果顯示，添加劑CH3CSNH2對鎳基182合金銲道具有抑制鈍化以及催化枝晶間腐蝕和晶界腐蝕之效果，且對電位-85mVSCE而言，所添加的CH3CSNH2會使得原硫酸溶液中的活性轉鈍性電位轉換成活性電位，而容易使材料在應力作用下，發生腐蝕主導的破裂，甚至可能會造成過度腐蝕現象。

Abstract
The effects of applied potential, strain rate, heat treatments and thioacetamide (CH3CSNH2) on the environmentally-assisted crack (EAC) or stress corrosion cracking (SCC) behavior of Alloy 182 weld in 0.05M sulfuric acid solution were investigated. Slow strain rate tests (SSRTs) were employed to evaluate the SCC resistance. The experimental results showed that Alloy 182 weld, without heat treatment, was most susceptible to EAC in the active-to-passive potential range. The SSRT results also demonstrated that, for the as-weld Alloy 182, the EAC resistance decreased with decreasing strain rate when the specimens were strained at -85mVSCE. Furthermore, in 0.05M H2SO4 solution and at -85mVSCE, the SSRT results showed that stress-relief (SR) heat treatment at 650℃ for 24h would cause an increase in the EAC susceptibility, where solution annealing (SA) at 1100℃ for 0.5h gave rise to an increase in EAC resistance as compared with that of the as-weld Alloy 182. The addition of CH3CSNH2 caused accelerated corrosion of all the Alloy 182 welds in 0.05M H2SO4 solution. Though an enhanced corrosion was observed, SCC was not observed with the addition CH3CSNH2 in the sulfuric acid solution.

總目錄
摘要.......................................................................I
Abstract...................................................................III
誌謝.......................................................................V
總目錄.....................................................................VI
表目錄.....................................................................VIII
壹、前言...................................................................1
貳、相關文獻及理論.........................................................4
2-1 鎳基182合金的介紹......................................................4
2-2 鎳基182合金SCC與敏化相關文獻...........................................7
2-3 單環動電位再活化技術(single loop electrochemical potentiokinetic reactivation, SL-EPR )的原理簡介與沿革.....................................10
2-4 慢應變速率拉伸試驗(slow-strain-rate test, SSRT)........................13
參、實驗步驟與方法.........................................................17
3-1 材料組成與試片製備.....................................................17
3-2金相組織觀察............................................................20
3-3 電化學試驗.............................................................20
3-3-1 動電位極化試驗 (potentiodynamic polarization test)...................21
3-3-2 單環動電位再活化試驗 (SL-EPR)........................................21
3-4 慢應變速率拉伸試驗(slow strain-rate test, SSRT)........................23
3-4-1 拉伸試棒製備與裝置...................................................23
3-4-2 控制電位之影響試驗...................................................30
3-4-3 拉伸速率之影響試驗...................................................30
3-4-4 銲後熱處理之影響試驗.................................................31
3-4-5 添加劑硫代乙醯胺之影響試驗...........................................31
肆、結果與討論.............................................................32
4-1 金相觀察結果與討論.....................................................32
4-2 電化學試驗結果與討論...................................................32
4-2-1 動電位極化試驗結果與討論.............................................32
4-2-2 單環動電位再活化現象.................................................41
4-3 慢應變速率拉伸試驗結果與討論...........................................46
4-3-1 控制電位之影響.......................................................46
4-3-2 應變速率之影響.......................................................55
4-3-3 熱處理之影響.........................................................59
4-3-4 添加劑硫代乙醯胺(CH3CSNH2)之影響.....................................67
五、結論...................................................................74
陸、參考文獻...............................................................76


                                    

陸、參考文獻
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校內：2007-07-11公開
校外：2007-07-11公開

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