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鎳基合金應(yīng)力腐蝕裂尖氧化膜力學(xué)特性分析
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國家自然科學(xué)基金項目(50875207)；國家自然科學(xué)基金項目(11072191)；陜西省教育廳專項基金項目(09JK591)


Analysis on Mechanical Property of Oxide Film in Stress Corrosion Cracking Tip of Nickel-based Alloys
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    摘要:

    裂紋尖端氧化膜形成與破裂是核電站壓力容器高溫水環(huán)境中鎳基合金材料應(yīng)力腐蝕開裂(SCC)的主要過程之一。由于應(yīng)力腐蝕裂紋尖端形貌和擴(kuò)展方式的特殊性，本研究利用ABAQUS有限元軟件的子模型技術(shù)，在微觀尺度下對由裂尖氧化膜和基體金屬共同構(gòu)成的應(yīng)力腐蝕裂尖應(yīng)力應(yīng)變場進(jìn)行了分析。結(jié)果表明，SCC裂尖氧化膜前端溝形裂紋的存在，會造成氧化膜中應(yīng)力和應(yīng)變的很大變化，且隨著溝形裂紋的長度增加，這種變化越加明顯；另一方面，與氧化膜中應(yīng)力相比，塑性應(yīng)變對裂尖形貌變化更加敏感，從一個側(cè)面說明，裂尖塑性應(yīng)變是研究SCC裂尖氧化膜形成與破裂比較理想的力學(xué)參量

    Abstract:

    It is one of the basic processes that the oxide film form and rupture in the tip of stress corrosion cracking (SCC) of nickel-base alloys in high temperature water environment of the nuclear pressure vessel. Because of the particularity of the propagating mode and morphology of the tip of SCC, the stress and strain in the tip of SCC constituted of the tip oxide film and base metal was simulated and analyzed under the micro scale based on the sub-model technology in ABAQUS software. The results show that the groove-type crack significantly affects the stress and the plastic strain in the oxide film at the SCC crack tip, and the longer the groove-type crack is, the more obvious the effect is. On the other hand, compared with stress, the plastic strain is more sensitive to the morphology of the tip of SCC; therefore, the plastic strain should be an appropriate mechanical parameter to investigate the oxide film character in the SCC crack tip

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薛 河,薛曉峰,唐 偉,趙凌燕,龔曉燕.鎳基合金應(yīng)力腐蝕裂尖氧化膜力學(xué)特性分析[J].稀有金屬材料與工程,2011,40(7):1188~1191.[Xue He, Xue Xiaofeng, Tang Wei, Zhao Lingyan, Gong Xiaoyan. Analysis on Mechanical Property of Oxide Film in Stress Corrosion Cracking Tip of Nickel-based Alloys[J]. Rare Metal Materials and Engineering,2011,40(7):1188~1191.]
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  • 收稿日期:2010-12-30
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