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  • 學位論文

高溫純水中82合金與304低碳不□鋼異材銲件之應力腐蝕研究

An Investigation into Stress Corrosion Cracking of 304L SS-Alloy 82 Dissimilar Metal Weld in High Temperature Pure Water

指導教授 : 蔡春鴻 葉宗洸

摘要


近年來,許多商用輕水式反應器(Light Water Reactor, LWR)的結構組件更陸續出現異材金屬銲件的應力腐蝕龜裂(Stress Corrosion Crack, SCC) 問題,世界各國的研發機構也因此投入相當大的人力進行相關議題的研究。國內電廠結構組件上銲件所使用沃斯田不□鋼(304與304L)與82合金,亦非常可能面臨類似的SCC問題,因此值得在模擬國內核一、二廠水化學環境中,針對此類銲件進行殘留應力與SCC分析研究。本實驗研究鎳基合金與沃斯田系不□鋼異材間的應力腐蝕龜裂行為,探討銲件母材與鎳基合金Alloy 82銲道應力腐蝕龜裂敏感性(Susceptibility)及裂縫生長行為。銲件經銲後熱處理(Post-weld Heat Treatment)、珠擊(Shot Peening)面處理後、固溶退火(solution annealing)處理與表面研磨(surface polishing),對於防治應力腐蝕劣化效益的測試評估。經由慢速拉伸實驗結果得知,較慢的拉伸速率較易產生SCC的破裂機制。另外也得知,經由(6500C/24hrs)銲後熱處理的試樣較容易產生IGSCC,而珠擊處理與固溶退火處理則不容易。珠擊處理可將試樣強度提升,固溶退火則是伸長量提升。經由本實驗得知珠擊處理與固溶退火處理都有良好的抑制IGSCC效果。 關鍵字:輕水式反應器、異材金屬焊件、應力腐蝕龜裂、殘留應力。

並列摘要


參考文獻


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被引用紀錄


黃彥瑞(2012)。高溫純水中應用CBB法於304不鏽鋼- 82合金異材銲件之應力腐蝕研究〔碩士論文,國立清華大學〕。華藝線上圖書館。https://doi.org/10.6843/NTHU.2012.00312

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