LY12CZ铝合金在人工海水中的腐蚀疲劳裂纹扩展行为
Corrosion Fatigue Crack Growth Behavior of LY12CZ Aluminum Alloy in Atificial Seawater
摘 要
采用腐蚀疲劳试验方法, 研究了LY12CZ铝合金在人工海水(3.5%NaCl溶液)中腐蚀疲劳裂纹的扩展规律, 分析了载荷频率、应力比以及人工海水pH对裂纹扩展速率的影响, 并借助扫描电镜对其断口形貌进行了观察。结果表明: 随载荷频率、人工海水pH的降低, 腐蚀疲劳裂纹扩展速率会显著加快, 应力比则主要影响腐蚀疲劳近门槛值区的裂纹扩展; 在中性人工海水中阳极溶解对裂纹加速扩展起主导作用; 随人工海水pH的降低, 裂尖氢置换反应加剧, 裂尖材料氢损伤对裂纹扩展的加速效应逐渐显现。
裂纹扩展
阳极溶解
氢损伤
corrosion fatigue
crack propagation
anodic dissolution
hydrogen damage
Abstract
A corrosion fatigue test was applied to study the corrosion fatigue crack propagation behavior of LY12CZ aluminum alloy in artificial seawater (3.5wt%NaCl solution). The influences of loading frequency, stress ratio and the pH value of artificial seawater on crack propagation rate were analyzed, and the fracture was observed by SEM to study the mechanism of crack propagation. The test results show that when the loading frequency and pH value decreased, the crack propagation rate increased significantly, and the stress ratio mainly affected the crack propagation behavior in the near-threshold region. Anodic dissolution played an important role in accelerating crack propagation in neutral seawater. However, with the reduction of pH value of artificial seawater the hydrogen replacement reaction at crack tip intensified, and the hydrogen damage of material at crack tip greatly promoted the crack propagation.
中图分类号 O346.22 DOI 10.11973/jxgccl201506019
所属栏目 材料性能及其应用
基金项目 国家自然科学基金资助项目(51404286); 山东省自然科学基金资助项目(ZR2014EEQ018); 青岛经济技术开发区重点科技发展计划项目(2013-1-53)
收稿日期 2014/2/21
修改稿日期 2015/5/14
网络出版日期
作者单位点击查看
备注黄小光(1980—), 男, 浙江乐清人, 讲师, 博士。
引用该论文: HUANG Xiao-guang,WANG Li-ming,CAO Yuo-guang. Corrosion Fatigue Crack Growth Behavior of LY12CZ Aluminum Alloy in Atificial Seawater[J]. Materials for mechancial engineering, 2015, 39(6): 95～98
黄小光,王黎明,曹宇光. LY12CZ铝合金在人工海水中的腐蚀疲劳裂纹扩展行为[J]. 机械工程材料, 2015, 39(6): 95～98
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参考文献
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【23】GB/T 20120.2—1998 金属与合金的腐蚀-腐蚀疲劳试验第2部分: 预裂纹试样裂纹扩展试验试验[S].
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【25】王政富, 魏学军, 李劲, 等. 阳极溶解及氢进入对裂纹尖端局部材料力学行为的作用[J]. 中国腐蚀与防护学报, 1995, 7(2): 157-161.
【26】MENAN F, HENAFF G.Influence of frequency and exposure to a saline solution on the corrosion fatigue crack propagation behavior of the aluminum alloy 2024[J]. International Journal of Fatigue, 2009, 31(11/12): 1684-1695.
【2】BELLINGER N C, KOMOROWSHI J P. Corrosion pillowing stresses in fuselage lap joints[J]. AIAA Journal, 1997, 35(2): 317-320.
【3】刘晶晶, 孙俊君, 胡海云, 等. 海洋腐蚀条件下材料环境失效的寿命预测[J]. 物理学报, 2005, 54(5): 2414-2417.
【4】RUIZ J, ELICES M. Environmental fatigue in a 7000 series aluminum alloy[J]. Corrosion Science, 1996, 38: 1815-1837.
【5】沈海军, 吕国志. 腐蚀疲劳裂纹扩展过程中裂尖阳极溶解的贡献[J]. 西北工业大学学报, 2001, 19(2): 225-228.
【6】ZHAO Wei-ming, XIN Ruo-fei, HE Zhi-rong, et al. Contribution of anodic dissolution to the corrosion fatigue crack propagation of X80 steel in 3.5 wt.% NaCl solution[J]. Corrosion Science, 2012, 63: 387-392.
【7】ROBERTSON I M. The effect of hydrogen on dislocation dynamics[J]. Engineering Fracture Mechanics, 2001, 68(6): 671-692.
【8】王政富, 魏学军, 李劲, 等. 阳极溶解及氢进入对裂纹尖端局部材料力学行为的作用[J]. 中国腐蚀与防护学报, 1995, 7(2): 157-161.
【9】MENAN F, HENAFF G.Influence of frequency and exposure to a saline solution on the corrosion fatigue crack propagation behavior of the aluminum alloy 2024[J]. International Journal of Fatigue, 2009, 31(11/12): 1684-1695.
【10】ENGELHARDT G R, MACDONALD D D. Modelling the crack propagation rate for corrosion fatigue at high frequency of applied stress[J]. Corrosion Science, 2010, 52: 1115-1122.
【11】SADANANADA K, VASUDEVAN A K. Crack tip driving forces and crack growth representation under fatigue[J]. International Journal of Fatigue, 2004, 26 (1): 39-47.
【12】MURAKAMI R I, KIM Y H, FERGUSON W G. The effects of microstructure and fracture surface roughness on near threshold fatigue crack propagation characteristics of a two-phase cast stainless steel[J].Fatigue & Fracture of Engineering Materials & Structures, 1991, 14(7): 741-748.
【13】FONTE M, ROMEIRO F, FREITAS M, et al. The effect of microstructure and environment on fatigue crack propagation in 7049 aluminium alloy at negative stress ratios[J]. International Journal of Fatigue, 2003, 25(9/11): 1209-1216.
【14】KERMANIDIS A T, PETROYIANIS P V, PANTELAKIS S G. Fatigue and damage tolerance behaviour of corroded 2024 T351 aircraft aluminum alloy[J]. Theoretical and Applied Fracture Mechanics, 2005, 43 (1): 121-132.
【15】穆志韬, 李荻. LY12CZ 铝合金型材构件腐蚀失效动力学规律研究[J]. 机械工程材料, 2003, 27(8): 18-20.
【16】李鸿鹏, 李锋, 马康民, 等. LY12CZ铝合金腐蚀疲劳研究进展[J]. 腐蚀科学与防护技术, 2005, 17(3): 175-177.
【17】李旭东, 穆志韬, 刘治国, 等. LY12CZ 航空铝合金腐蚀疲劳断口研究[J]. 装备环境工程, 2013, 10(4): 9-12.
【18】ZHANG You-hong, CHANG Xin-long, LV Guo-zhi, et al. Corrosion fatigue behavior of fastening hole structure and virtual crack propagation tests[J]. Journal of University of Science and Technology Beijing, 2008, 15(5): 585-589.
【19】WANG Rong. A fracture model of corrosion fatigue crack propagation of aluminum alloys based on the material elements fracture ahead of a crack tip[J].Engineering Fracture Mechanics, 2008, 30: 1376-1386.
【20】张波, 鲁自界, 韩恩厚, 等. 频率对LY12CZ铝合金在3.5%NaCl溶液中腐蚀疲劳裂纹扩展的影响[C]//第十届全国疲劳与断裂学术会议论文集. 中国广州: [出版者不详], 2000: 310-313.
【21】ASTM E647-00. In annual book of ASTM standards[S].
【22】GANGLOFF R P. Corrosion fatigue crack propagation in metals [M]. USA: National Association of Corrosion Engineers, 1989.
【23】GB/T 20120.2—1998 金属与合金的腐蚀-腐蚀疲劳试验第2部分: 预裂纹试样裂纹扩展试验试验[S].
【24】VASUDEVAN A K, SURESH S. Influence of corrosion deposits on near-threshold fatigue crack growth behavior in 2XXX and 7XXX series aluminum alloys[J]. Metallurgical Transactions: A, 1982, 13: 2271-2280.
【25】王政富, 魏学军, 李劲, 等. 阳极溶解及氢进入对裂纹尖端局部材料力学行为的作用[J]. 中国腐蚀与防护学报, 1995, 7(2): 157-161.
【26】MENAN F, HENAFF G.Influence of frequency and exposure to a saline solution on the corrosion fatigue crack propagation behavior of the aluminum alloy 2024[J]. International Journal of Fatigue, 2009, 31(11/12): 1684-1695.
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