二氧化硫复合盐雾环境下2024-T351铝合金应力腐蚀开裂
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摘要
通过SO_2复合盐雾试验模拟工业污染海洋大气环境,结合有限元模拟分析、扫描电镜/能谱仪、光电子能谱分析等技术研究2024-T351铝合金在弹性应力区间的应力腐蚀开裂行为.结果表明:应力腐蚀开裂行为优先发生在2024-T351铝合金C型环的顶部应力集中区域;疏松的腐蚀产物层的形貌经历了由细棒状、团絮状到板块状的变化;试验6 h就可以监测到裂纹,进行到480 h的时候有贯穿裂纹形成,720 h的时候试样完全断裂;裂纹为穿晶和沿晶混合机制,主裂纹以穿晶机制沿C型环法线扩展,二次裂纹沿晶界扩展.
The stress corrosion cracking of 2024-T351 aluminum alloy was investigated by finite element simulation analysis,scanning electron microscopy/energy dispersive spectrometry,and X-ray photoelectron spectroscopy through SO2 mixed salt spray test.Results indicate that stress corrosion cracking initiates preferentially at the region of stress concentration of the C-ring top for 2024-T351 aluminum alloy. The morphologies of loose corrosion products change from fine rod-like and flocculent to plate-like. Secondary cracks form in the internal corrosion crack after 6 h,when the corrosion time increases to 480 h,and the fractures and cracks in the surface of the C-ring side penetrate the whole sample. The C-ring sample completely breaks after 720 h. The opening crack propagation is a mixed mode of transgranular and intergranular,while the main cracks extend along the normal of the C-ring and the secondary cracks extend mainly along the grain boundaries.
The stress corrosion cracking of 2024-T351 aluminum alloy was investigated by finite element simulation analysis,scanning electron microscopy/energy dispersive spectrometry,and X-ray photoelectron spectroscopy through SO2 mixed salt spray test.Results indicate that stress corrosion cracking initiates preferentially at the region of stress concentration of the C-ring top for 2024-T351 aluminum alloy. The morphologies of loose corrosion products change from fine rod-like and flocculent to plate-like. Secondary cracks form in the internal corrosion crack after 6 h,when the corrosion time increases to 480 h,and the fractures and cracks in the surface of the C-ring side penetrate the whole sample. The C-ring sample completely breaks after 720 h. The opening crack propagation is a mixed mode of transgranular and intergranular,while the main cracks extend along the normal of the C-ring and the secondary cracks extend mainly along the grain boundaries.
引文
[1]Dursun T,Soutis C.Recent developments in advanced aircraft aluminium alloys.Mater Des,2014,56:862
[2]Cui Z Y,Li X G,Xiao K,et al.Exfoliation corrosion behavior of2Bo6 aluminum alloy in a tropical marine atmosphere.J Mater Eng Perform,2015,24(1):296
[3]De La Fuente D,Otero-Huerta E,Morcillo M.Studies of longterm weathering of aluminium in the atmosphere.Corros Sci,2007,49(7):3134
[4]Misak H E,Perel V Y,Sabelkin V,et al.Biaxial tension-tension fatigue crack growth behavior of 2024--T3 under ambient air and salt water environments.Eng Fract Mech,2014,118:83
[5]Zhang X Y,Huo Q M,Sun Z H et al.The corrosion behavior of high strength aluminum alloys in different environments.Chin Sci Bull,2008,53(23):2860(张晓云,霍乾明,孙志华,等.高强铝合金在不同环境下的应力腐蚀行为.科学通报,2008,53(23):2860)
[6]Zheng L,Feng X H,Huang W G,et al.Research on the stress corrosion of LC52 aluminum alloy butt welding in marine atmosphere.Equip Environ Eng,2005,2(4):61(郑林,封先河,黄维刚,等.铝合金LC52对接焊海洋大气应力腐蚀研究.装备环境工程,2005,2(4):61)
[7]Tsai T C,Chuang T H.Atmospheric stress corrosion cracking of a superplastic 7475 aluminum alloy.Metall Mater Trans A,1996,27(9):2617
[8]Wang B B,Wang Z Y,Han W,et al.Atmospheric corrosion of aluminium alloy 2024-T3 exposed to salt lake environment in Western China.Corros Sci,2012,59:63
[9]Zhang X Y,Sun Z H,Liu M H,et al.Influence of different environments on stress corrosion cracking of high strength aluminum alloys.J Chin Soc Corros Prot,2007,27(6):354(张晓云,孙志华,刘明辉,等.环境对高强度铝合金应力腐蚀行为的影响.中国腐蚀与防护学报,2009,27(6):354)
[10]Li T,Dong C F,Li X G,et al.Influence of environmental factors on atmosphere corrosion of aluminum alloys and its dynamic time dependence.Corros Prot,2009,30(4):215(李涛,董超芳,李晓刚,等.环境因素对铝合金大气腐蚀的影响及其动态变化规律研究.腐蚀与防护,2009,30(4):215)
[11]Sun S Q,Zheng Q F,Li D F,et al.Exfoliation corrosion of extruded 2024--T4 in the coastal environments in China.Corros Sci,2011,53(8):2527
[12]Kermanidis A T,Petroyiannis P V,Pantelakis S G.Fatigue and damage tolerance behaviour of corroded 2024 T351 aircraft aluminum alloy.Theor Appl Fract Mech,2005,43(1):121
[13]Lacroix L,Blanc C,Pebere N,et al.Simulating the galvanic coupling between S--Al2Cu Mg phase particles and the matrix of2024 aerospace aluminum alloy.Corros Sci,2012,64:213
[14]Burns J T,Larsen J M,Gangloff R P.Driving forces for localized corrosion-to-fatigue crack transition in Al-Zn--Mg-Cu.Fatigue Fract Eng Mater Struct,2011,34(10):745
[15]Sheng H,Dong C F,Xiao K,et al.Anodic dissolution of a crack tip at AA2024--T351 in 3.5 wt%Na Cl solution.Int J Miner Metall Mater,2012,19(10):939
[16]Pidaparti R M,Patel R R.Correlation between corrosion pits and stresses in Al alloys.Mater Lett,2008,62(30):4497
[2]Cui Z Y,Li X G,Xiao K,et al.Exfoliation corrosion behavior of2Bo6 aluminum alloy in a tropical marine atmosphere.J Mater Eng Perform,2015,24(1):296
[3]De La Fuente D,Otero-Huerta E,Morcillo M.Studies of longterm weathering of aluminium in the atmosphere.Corros Sci,2007,49(7):3134
[4]Misak H E,Perel V Y,Sabelkin V,et al.Biaxial tension-tension fatigue crack growth behavior of 2024--T3 under ambient air and salt water environments.Eng Fract Mech,2014,118:83
[5]Zhang X Y,Huo Q M,Sun Z H et al.The corrosion behavior of high strength aluminum alloys in different environments.Chin Sci Bull,2008,53(23):2860(张晓云,霍乾明,孙志华,等.高强铝合金在不同环境下的应力腐蚀行为.科学通报,2008,53(23):2860)
[6]Zheng L,Feng X H,Huang W G,et al.Research on the stress corrosion of LC52 aluminum alloy butt welding in marine atmosphere.Equip Environ Eng,2005,2(4):61(郑林,封先河,黄维刚,等.铝合金LC52对接焊海洋大气应力腐蚀研究.装备环境工程,2005,2(4):61)
[7]Tsai T C,Chuang T H.Atmospheric stress corrosion cracking of a superplastic 7475 aluminum alloy.Metall Mater Trans A,1996,27(9):2617
[8]Wang B B,Wang Z Y,Han W,et al.Atmospheric corrosion of aluminium alloy 2024-T3 exposed to salt lake environment in Western China.Corros Sci,2012,59:63
[9]Zhang X Y,Sun Z H,Liu M H,et al.Influence of different environments on stress corrosion cracking of high strength aluminum alloys.J Chin Soc Corros Prot,2007,27(6):354(张晓云,孙志华,刘明辉,等.环境对高强度铝合金应力腐蚀行为的影响.中国腐蚀与防护学报,2009,27(6):354)
[10]Li T,Dong C F,Li X G,et al.Influence of environmental factors on atmosphere corrosion of aluminum alloys and its dynamic time dependence.Corros Prot,2009,30(4):215(李涛,董超芳,李晓刚,等.环境因素对铝合金大气腐蚀的影响及其动态变化规律研究.腐蚀与防护,2009,30(4):215)
[11]Sun S Q,Zheng Q F,Li D F,et al.Exfoliation corrosion of extruded 2024--T4 in the coastal environments in China.Corros Sci,2011,53(8):2527
[12]Kermanidis A T,Petroyiannis P V,Pantelakis S G.Fatigue and damage tolerance behaviour of corroded 2024 T351 aircraft aluminum alloy.Theor Appl Fract Mech,2005,43(1):121
[13]Lacroix L,Blanc C,Pebere N,et al.Simulating the galvanic coupling between S--Al2Cu Mg phase particles and the matrix of2024 aerospace aluminum alloy.Corros Sci,2012,64:213
[14]Burns J T,Larsen J M,Gangloff R P.Driving forces for localized corrosion-to-fatigue crack transition in Al-Zn--Mg-Cu.Fatigue Fract Eng Mater Struct,2011,34(10):745
[15]Sheng H,Dong C F,Xiao K,et al.Anodic dissolution of a crack tip at AA2024--T351 in 3.5 wt%Na Cl solution.Int J Miner Metall Mater,2012,19(10):939
[16]Pidaparti R M,Patel R R.Correlation between corrosion pits and stresses in Al alloys.Mater Lett,2008,62(30):4497