激光冲击强化层数对6061-T6铝合金抗腐蚀性能的影响
|
摘要
针对6061-T6铝合金在各种极端工况下抗腐蚀性较差的问题,采用激光冲击强化对6061-T6铝合金进行不同层数的冲击处理,通过测量残余应力和表面粗糙度观察了微观组织和电化学腐蚀,分析了激光冲击强化对6061-T6铝合金抗腐蚀性能的影响。结果表明:激光冲击强化后,材料表面的残余压应力、表面硬度随激光冲击层数的增加而增加;冲击区域晶粒明显细化,细化层深度随冲击层数的增加而增加;材料表面的粗糙度随冲击层数的增加而降低;激光冲击强化处理后材料的电化学腐蚀电流减小、阻抗半径增大,表面点蚀坑的生长受到明显抑制;残余应力增加、微观组织细化和表面粗糙度降低,三者共同作用提升了6061-T6铝合金的抗腐蚀性能。
To solve the problem of the poor corrosion resistance of 6061-T6 aluminum alloy under various extreme working condition, experiments for 6061-T6 aluminum alloy were carried out using laser shock peening with different coverage layers. Then the effect of laser shock peening on the corrosion resistance of 6061-t6 aluminum alloy was analyzed by measuring the residual stress and surface roughness, observing the microstructure and electrochemical corrosion test. The results suggest that the residual stress and surface hardness increase with the increase of the laser shock coverage layer. The alloy grains are refined obviously in the impacting area, and the scale of grain refinement layer extends with the increase of laser shock coverage layer.The surface roughness decreases with the increase of laser shock coverage layer. After laser shock peening, the corrosion resistance of 6061-T6 aluminum alloy is obviously improved, the electro-chemical corrosion current decreases and the impedance radius increases, the growth of surface pitting pits is obviously inhibited. The combining effects of increased residual stress, microstructure refinement and decreased surface roughness improve the corrosion resistance of 6061-T6 aluminum alloy.
To solve the problem of the poor corrosion resistance of 6061-T6 aluminum alloy under various extreme working condition, experiments for 6061-T6 aluminum alloy were carried out using laser shock peening with different coverage layers. Then the effect of laser shock peening on the corrosion resistance of 6061-t6 aluminum alloy was analyzed by measuring the residual stress and surface roughness, observing the microstructure and electrochemical corrosion test. The results suggest that the residual stress and surface hardness increase with the increase of the laser shock coverage layer. The alloy grains are refined obviously in the impacting area, and the scale of grain refinement layer extends with the increase of laser shock coverage layer.The surface roughness decreases with the increase of laser shock coverage layer. After laser shock peening, the corrosion resistance of 6061-T6 aluminum alloy is obviously improved, the electro-chemical corrosion current decreases and the impedance radius increases, the growth of surface pitting pits is obviously inhibited. The combining effects of increased residual stress, microstructure refinement and decreased surface roughness improve the corrosion resistance of 6061-T6 aluminum alloy.
引文
[1]Gencald I S,Saklakoglu N,Akman E,et al.Pulsed Nd:YAG laser shock processing effects on mechanical properties of 6061-T6 alloy[J].Optics&Laser Technology,2014,56(1):273-277.
[2]Zhang X C,Zhang Y K,Lu J Z,et al.Improvement of fatigue life of Ti-6Al-4V alloy by laser shock peening[J].Materials Science&Engineering A,2010,527(15):3411-3415.
[3]葛茂忠,张永康,项建云.AZ31B镁合金激光冲击强化及抗应力腐蚀研究[J].中国激光,2010,37(11):2925-2930.Ge Mao-zhong,Zhang Yong-kang,Xiang Jian-yun.Research on laser shock strengthening and stress corrosion cracking resistance of AZ31B magnesium alloy[J].Chinese Journal Lasers,2010,37(11):2925-2930.
[4]Yang J M,Her Y C,Han N,et al.Laser shock peening on fatigue behavior of 2024-T3 Al alloy with fastener holes and stopholes[J].Materials Science&Engineering A,2001,298(1/2):296-299.
[5]邢清蒲,张凌峰,李少哲,等.激光冲击强化对2A02铝合金电化学腐蚀行为的影响[J].腐蚀科学与防护技术,2013,25(5):402-405.Xing Qing-pu,Zhang Ling-feng,Li Shao-zhe,et al.Effect of laser shock processing on electrochemical corrosion behavior of 2A02 aluminum alloy[J].Corrosion Science&Protection Technology,2013,25(5):402-405.
[6]王江涛,张永康,陈菊芳,等.强激光冲击对7075铝合金等离子弧焊接头电化学腐蚀行为的影响[J].中国激光,2015,42(12):106-115.Wang Jiang-tao,Zhang Yong-kang,Chen Ju-fang,et al.Effect of laser shock processing on electrochemical corrosion behavior of 7075 aluminum alloy plasma arc weldments[J].Chinese Journal of Lasers,2015,42(12):106-115.
[7]汪诚,赖志林,何卫锋,等.激光冲击次数对1Cr11Ni2W2MoV不锈钢高周疲劳性能的影响[J].中国激光,2014,41(1):46-51.Wang Cheng,Lai Zhi-lin,He Wei-feng,et al.Effect of multi-impact on high cycle fatigue properties of1Cr11Ni2W2MoV stainless steel subject to laser shock processing[J].Chinese Journal of Lasers,2014,41(1):46-51.
[8]Di S A,Kenny J M.Grain size dependence of the fatigue behaviour of a ultrafine-grained AISI 304stainless steel[J].Materials Letters,2003,57(21):3182-3185.
[9]Zhen L,Hu H,Wang X Y,et al.Distribution characterization of boundary misorientation angle of 7050aluminum alloy after high-temperature compression[J].Journal of Materials Processing Technology,2009,209(2):754-761.
[10]Li Q,Xu Y B,Lai Z H,et al.Dynamic recrystallization induced by plastic deformation at high strain rate in a Monel alloy[J].Materials Science and Engineering A,2000,276(1/2):250-256.
[11]Mazurina I,Sakai T,Miura H,et al.Grain refinement in aluminum alloy 2219 during ECAP at 250℃[J].Materials Science and Engineering A,2008,473(1/2):297-305.
[12]Lu J Z,Han B,Cui C Y,et al.Electrochemical and pitting corrosion resistance of AISI 4145 steel subjected to massive laser shock peening treatment with different coverage layers[J].Optics&Laser Technology,2017,88:250-262.
[13]李少哲,张凌峰,邢清蒲.激光冲击强化对AZ91镁合金的电化学腐蚀行为的影响[J].中国激光,2013,40(5):74-78.Li Shao-zhe,Zhang Ling-feng,Xing Qing-pu.Effect of laser shock processing on electrochemical corrosion behavior of AZ91 magnesium alloy[J].Chinese Journal of Lasers,2013,40(5):74-78.
[14]Amar H,Vignal V,Krawiec H,et al.Influence of the microstructure and laser shock processing(LSP)on the corrosion behavior of the AA2050-T8 aluminium alloy[J].Corrosion Science,2011,53(10):3215-3221.
[15]陈菊芳,张永康,许仁军.AM50镁合金表面激光熔凝层的组织与耐蚀性能[J].中国激光,2008,35(2):307-310.Chen Ju-fang,Zhang Yong-kang,Xu Ren-jun.Microstructure and corrosion resistant property of laser surface melting layer of AM50 magnesium alloy[J].Chinese Journal of Lasers,2008,35(2):307-310.
[16]罗新民,张静文,赵广志,等.激光冲击强化对2A02铝合金疲劳行为的影响[J].中国激光,2009,36(12):3323-3328.Luo Xin-min,Zhang Jing-wen,Zhao Guang-zhi,et al.Effect of laser shock strengthening on fatigue behaviors of 2A02 aluminum alloy[J].Chinese Journal of Lasers,2009,36(12):3323-3328.
[17]洪晰,王声波,郭大浩,等.激光冲击波在铝靶中衰减特性的研究[J].量子电子学报,1998,15(5):474-478.Hong Xi,Wang Sheng-bo,Guo Da-hao,et al.Rsesearch on the attenuation property of the laser induced shock wave propagating in aluminum[J].Chinese Joural of Quantum Electronics,1998,15(5):474-478.
[18]叶作彦.新型铝合金的腐蚀行为及表面改性的影响[D].西安:西北工业大学材料学院,2015.Ye Zuo-yan.Corrosion behavior of new aluminum alloy and the effect of surface modification[D].Xi'an:College of Materials,Northwestern Polytechnical University,2015.
[2]Zhang X C,Zhang Y K,Lu J Z,et al.Improvement of fatigue life of Ti-6Al-4V alloy by laser shock peening[J].Materials Science&Engineering A,2010,527(15):3411-3415.
[3]葛茂忠,张永康,项建云.AZ31B镁合金激光冲击强化及抗应力腐蚀研究[J].中国激光,2010,37(11):2925-2930.Ge Mao-zhong,Zhang Yong-kang,Xiang Jian-yun.Research on laser shock strengthening and stress corrosion cracking resistance of AZ31B magnesium alloy[J].Chinese Journal Lasers,2010,37(11):2925-2930.
[4]Yang J M,Her Y C,Han N,et al.Laser shock peening on fatigue behavior of 2024-T3 Al alloy with fastener holes and stopholes[J].Materials Science&Engineering A,2001,298(1/2):296-299.
[5]邢清蒲,张凌峰,李少哲,等.激光冲击强化对2A02铝合金电化学腐蚀行为的影响[J].腐蚀科学与防护技术,2013,25(5):402-405.Xing Qing-pu,Zhang Ling-feng,Li Shao-zhe,et al.Effect of laser shock processing on electrochemical corrosion behavior of 2A02 aluminum alloy[J].Corrosion Science&Protection Technology,2013,25(5):402-405.
[6]王江涛,张永康,陈菊芳,等.强激光冲击对7075铝合金等离子弧焊接头电化学腐蚀行为的影响[J].中国激光,2015,42(12):106-115.Wang Jiang-tao,Zhang Yong-kang,Chen Ju-fang,et al.Effect of laser shock processing on electrochemical corrosion behavior of 7075 aluminum alloy plasma arc weldments[J].Chinese Journal of Lasers,2015,42(12):106-115.
[7]汪诚,赖志林,何卫锋,等.激光冲击次数对1Cr11Ni2W2MoV不锈钢高周疲劳性能的影响[J].中国激光,2014,41(1):46-51.Wang Cheng,Lai Zhi-lin,He Wei-feng,et al.Effect of multi-impact on high cycle fatigue properties of1Cr11Ni2W2MoV stainless steel subject to laser shock processing[J].Chinese Journal of Lasers,2014,41(1):46-51.
[8]Di S A,Kenny J M.Grain size dependence of the fatigue behaviour of a ultrafine-grained AISI 304stainless steel[J].Materials Letters,2003,57(21):3182-3185.
[9]Zhen L,Hu H,Wang X Y,et al.Distribution characterization of boundary misorientation angle of 7050aluminum alloy after high-temperature compression[J].Journal of Materials Processing Technology,2009,209(2):754-761.
[10]Li Q,Xu Y B,Lai Z H,et al.Dynamic recrystallization induced by plastic deformation at high strain rate in a Monel alloy[J].Materials Science and Engineering A,2000,276(1/2):250-256.
[11]Mazurina I,Sakai T,Miura H,et al.Grain refinement in aluminum alloy 2219 during ECAP at 250℃[J].Materials Science and Engineering A,2008,473(1/2):297-305.
[12]Lu J Z,Han B,Cui C Y,et al.Electrochemical and pitting corrosion resistance of AISI 4145 steel subjected to massive laser shock peening treatment with different coverage layers[J].Optics&Laser Technology,2017,88:250-262.
[13]李少哲,张凌峰,邢清蒲.激光冲击强化对AZ91镁合金的电化学腐蚀行为的影响[J].中国激光,2013,40(5):74-78.Li Shao-zhe,Zhang Ling-feng,Xing Qing-pu.Effect of laser shock processing on electrochemical corrosion behavior of AZ91 magnesium alloy[J].Chinese Journal of Lasers,2013,40(5):74-78.
[14]Amar H,Vignal V,Krawiec H,et al.Influence of the microstructure and laser shock processing(LSP)on the corrosion behavior of the AA2050-T8 aluminium alloy[J].Corrosion Science,2011,53(10):3215-3221.
[15]陈菊芳,张永康,许仁军.AM50镁合金表面激光熔凝层的组织与耐蚀性能[J].中国激光,2008,35(2):307-310.Chen Ju-fang,Zhang Yong-kang,Xu Ren-jun.Microstructure and corrosion resistant property of laser surface melting layer of AM50 magnesium alloy[J].Chinese Journal of Lasers,2008,35(2):307-310.
[16]罗新民,张静文,赵广志,等.激光冲击强化对2A02铝合金疲劳行为的影响[J].中国激光,2009,36(12):3323-3328.Luo Xin-min,Zhang Jing-wen,Zhao Guang-zhi,et al.Effect of laser shock strengthening on fatigue behaviors of 2A02 aluminum alloy[J].Chinese Journal of Lasers,2009,36(12):3323-3328.
[17]洪晰,王声波,郭大浩,等.激光冲击波在铝靶中衰减特性的研究[J].量子电子学报,1998,15(5):474-478.Hong Xi,Wang Sheng-bo,Guo Da-hao,et al.Rsesearch on the attenuation property of the laser induced shock wave propagating in aluminum[J].Chinese Joural of Quantum Electronics,1998,15(5):474-478.
[18]叶作彦.新型铝合金的腐蚀行为及表面改性的影响[D].西安:西北工业大学材料学院,2015.Ye Zuo-yan.Corrosion behavior of new aluminum alloy and the effect of surface modification[D].Xi'an:College of Materials,Northwestern Polytechnical University,2015.