Please use this identifier to cite or link to this item: http://hdl.handle.net/11455/10516
標題: 珠擊對7075-T651鋁合金應力腐蝕裂紋的影響
The Effect of Shot Peening on Stress Corrosion Cracking for 7075-T651 Aluminum Alloy
作者: Chen, Gi-Li
陳進立
關鍵字: SCC
應力腐蝕裂紋
出版社: 材料科學與工程學系所
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摘要: 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.
URI: http://hdl.handle.net/11455/10516
其他識別: U0005-2208200713584100
文章連結: http://www.airitilibrary.com/Publication/alDetailedMesh1?DocID=U0005-2208200713584100
Appears in Collections:材料科學與工程學系

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