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研究生:陳進立
研究生(外文):Gi-Li Chen
論文名稱:珠擊對7075-T651鋁合金應力腐蝕裂紋的影響
論文名稱(外文):The Effect of Shot Peening on Stress Corrosion Cracking for 7075-T651 Aluminum Alloy
指導教授:汪俊延
學位類別:碩士
校院名稱:國立中興大學
系所名稱:材料科學與工程學系所
學門:工程學門
學類:綜合工程學類
論文種類:學術論文
畢業學年度:97
語文別:中文
論文頁數:58
中文關鍵詞:應力腐蝕裂紋
外文關鍵詞:SCC
相關次數:
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摘要
本文探討應力腐蝕裂紋敏感性材料7075-T651鋁合金,使用最少四組弧高試片,以分別所需曝露時間及珠擊後弧高試片的撓曲度,建立所需珠擊強度的飽和曲線,然後以不同飽和曲線所設定的珠擊機械參數對C型環試片珠擊。
將珠擊過後不同珠擊強度及未珠擊C型環試片同時放入應力腐蝕裂紋設備,靜置曝露一段時間,觀察其應力腐蝕裂紋產生情形,結果顯示珠擊過後的試片,確實較未珠擊的試片不易產生應力腐蝕裂紋,甚至未產生應力腐蝕裂紋。
應力腐蝕裂紋需拉應力、腐蝕環境及敏感性材料三種條件同時存在時才會產生,而珠擊後會於材料表面產生殘留壓應力,由實驗證明珠擊確實可改善或抑制應力腐蝕裂紋的產生。
Abstract
This investigation presents the susceptible material of aluminum alloy 7075-T651 by shot peening at least 4 pieces of Alemen strip , using peening exposure time and Alemen strip deflection to create saturation curve. Then making use of the machine set-up parameters of the saturation curve generated to shot peening c-ring specimens.
The peened c-ring specimens of individually different shot peening intensities and unpeened c-ring specimens were put into stress corrosion cracking machine for exposuring a period of time. Observing the stress corrosion cracking situation of peened and unpeened c-ring specimens by metallurgical microscope. The results present the resistance to stress corrosion cracking of peened c-ring specimens were better than those unpeened. Furthermore, the stress corrosion cracking of the peened c-ring specimens didn’t occur sometimes.
The occurrence of stress corrosion cracking will be happened at the conditions of stress, corrosion environment and susceptible material exist simultaneously. The purpose of shot peening is to create residual compressive stress. Since the factor of stress superposition, shot peening can improve resistance to stress corrosion cracking from the evidence of this investigation.
總目錄
誌謝 i
Abstract ii
摘要 iii
總目錄 iv
圖目錄 vi
表目錄 vii
第一章 緒論 1
1.1 前言 1
1.2 研究背景 1
1.3 研究目的 3
第二章 理論基礎 5
2 珠擊原理與目的 5
2.1 珠擊原理 5
2.2 珠擊實務 6
2.2.1珠擊強度 6
2.2.2擊珠 8
2.2.3弧高試片 9
2.2.4飽和曲線 10
2.2.5覆蓋率 11
2.3 珠擊改善疲勞性質的原理 12
2.4 珠擊改善應力腐蝕裂紋的原理 14
第三章 實驗方法與步驟 18
3.實驗規劃 18
3.1 試片製備 18
3.2 試片珠擊 19
3.3 殘留應力量測 22
3.4 應力腐蝕實驗方法 26
3.4.1 施加應力的方法 26
3.4.2測試條件 28
3.4.3測試程序 28
3.4.4 C型環試片暴露靜置時間 29
3.4.4.1未施加外負荷於試片上 29
3.4.4.2施加外負荷於試片上 29
3.4.4.3金相觀察 29
第四章實驗結果與討論 30
4.1實驗結果 30
4.1.1飽和曲線建立 30
4.1.2未施加外負荷於試片上 30
4.1.3施加外負荷於試片上 31
4.1.3.1靜置曝露時間10天 31
4.1.3.2靜置曝露時間20天 32
4.1.3.3靜置曝露時間30天 32
4.2討論 33
第五章結論 44
參考文獻 46
圖目錄
圖2.1 珠擊於表層形成殘留壓應力的過程 5
圖2.2 珠擊過後所形成的殘留應力分佈情形示意圖 6
圖2.3 弧高試片珠擊後會產生撓曲,將該弧高試片放置於弧高試片量測儀器上量測其撓曲度值 7
圖2.4珠擊後弧高試片的殘留應力分佈 8
圖2.5鑄鋼擊珠外觀及分類等級圖 8
圖2.6弧高試片量測儀器外觀 9
圖2.7弧高試片因厚度不同,可分為三種型式示意圖 10
圖2.8珠擊飽和曲線 11
圖2.9覆蓋率外觀比較圖 12
圖2.10 零件在承受反覆式彎曲力矩(bending)作用下的應力示意圖 13
圖2.11珠擊過零件在承受外在負載時,珠擊殘留應力、負載所引起的應力及總合成應力分佈情形示意圖 14
圖2-12 應力腐蝕裂紋生成示意圖 15
圖2.13 零件在遭受拉應力、腐蝕環境及材料本身為應力腐蝕裂紋敏感材料三種條件同時存在時,才有可能產生應力腐蝕裂紋示意圖 16
圖2.14 鋁合金零件在珠擊後,再施行陽極化、噴底漆及面漆等表面處理,其發生應力腐蝕裂紋的順序示意圖 17
圖3.1試片尺寸示意圖 19
圖3.2 Progressive 珠擊機外觀 19
圖3.3未珠擊及珠擊過試片外觀比較圖 22
圖3.4主應力的座標系統圖 23
圖3.5 X光繞射量測殘留應力的簡示圖 24
圖3.6 珠擊殘留壓應力分佈圖 25
圖3.7 SCC實驗測試機器外觀 26
圖3.8 未珠擊及珠擊過C型環施加應力後的外觀 27
圖4.1 試片珠擊強度0.006A/0.008A的飽和曲線 38
圖4.2 在未施加外負荷於試片上,未珠擊及珠擊的試片,在曝露靜置20天後,在不同倍率下,金相觀察結果 40
圖4.3施加外負荷於試片上,未珠擊及珠擊的試片,在曝露靜置10/20/30天後,在不同倍率下,金相所觀察結果 41
圖4.4 未珠擊及珠擊的試片其粗糙度量測結果 43
表目錄
表3.1 珠擊強度0.006A及0.008A的機械參數設定表 21
表4.2.1未珠擊及已珠擊試片的實驗結果 33
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