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30% HNO3对2195铝锂合金预腐蚀疲劳特性研究

刘德俊 田干 李玉龙 张炜 张有宏

刘德俊,田干,李玉龙,等. 30% HNO3对2195铝锂合金预腐蚀疲劳特性研究[J]. 北京航空航天大学学报,2024,50(4):1129-1137 doi: 10.13700/j.bh.1001-5965.2022.0445
引用本文: 刘德俊,田干,李玉龙,等. 30% HNO3对2195铝锂合金预腐蚀疲劳特性研究[J]. 北京航空航天大学学报,2024,50(4):1129-1137 doi: 10.13700/j.bh.1001-5965.2022.0445
LIU D J,TIAN G,LI Y L,et al. Research on pre-corrosion fatigue properties of 2195 Al-Li alloys in 30% HNO3[J]. Journal of Beijing University of Aeronautics and Astronautics,2024,50(4):1129-1137 (in Chinese) doi: 10.13700/j.bh.1001-5965.2022.0445
Citation: LIU D J,TIAN G,LI Y L,et al. Research on pre-corrosion fatigue properties of 2195 Al-Li alloys in 30% HNO3[J]. Journal of Beijing University of Aeronautics and Astronautics,2024,50(4):1129-1137 (in Chinese) doi: 10.13700/j.bh.1001-5965.2022.0445

30% HNO3对2195铝锂合金预腐蚀疲劳特性研究

doi: 10.13700/j.bh.1001-5965.2022.0445
基金项目: 国家自然科学基金(52272446,52075541); 陕西省自然科学基金(2022JM-243)
详细信息
    通讯作者:

    E-mail:tiangan_2012@163.com

  • 中图分类号: V45;TG178

Research on pre-corrosion fatigue properties of 2195 Al-Li alloys in 30% HNO3

Funds: National Natural Science Foundation of China (52272446,52075541); Shaanxi Natural Science Foundation (2022JM-243)
More Information
  • 摘要:

    模拟液体导弹贮箱材料和使用特点,进行2195-T8 铝锂合金在30% 硝酸溶液中预腐蚀不同时间后的疲劳试验,利用扫描电子显微镜(SEM)、电子背散射衍射仪(EBSD)及透射电子显微镜(TEM)等显微表征方法,研究了预腐蚀对疲劳性能的影响。结果表明:预腐蚀表面形貌以晶间腐蚀和点蚀为主,在轧制方向上形成条带状腐蚀链,其产生与长条形晶界和金属间粒子连续腐蚀作用相关; 经预腐蚀后,铝锂合金试样在210 ,280,330 MPa中等应力幅下的预腐蚀疲劳寿命较无腐蚀试样有所增加,16 h腐蚀试样寿命提高最为明显,其原因是腐蚀通过将合金表面微裂纹、孔洞等缺陷消除、增加表面粗糙度等方式,降低了应力集中程度,进而延缓了疲劳裂纹萌生。

     

  • 图 1  试样尺寸及形状

    Figure 1.  Specimen size and shape

    图 2  试验状态

    Figure 2.  Test state

    图 3  2195-T8铝锂合金BSE形貌及元素能谱结果

    Figure 3.  BSE micrographs and EDS results of 2195-T8Al-Li alloys

    图 4  2195-T8 铝锂合金EBSD结果

    Figure 4.  EBSD results of 2195-T8 Al-Li alloys

    图 5  2195-T8 铝锂合金TEM结果

    Figure 5.  TEM results of 2195-T8 Al-Li alloys

    图 6  预腐蚀不同时间后合金表面形貌

    Figure 6.  Alloy surface morphology after different durations of pre-corrosion

    图 7  铝锂合金力学性能比较与预腐蚀结果

    Figure 7.  Mechanical properties comparison among various Al-Li alloys and pre-corrosion fatigue results

    图 8  2195-T8铝锂合金在不同预腐蚀时长试样疲劳断口形貌

    Figure 8.  Micrography of fatigue fracture surface of 2195-T8 Al-Li alloys under different pre-corrosion durations

    图 9  中等应力下各预腐蚀试样裂纹萌生区

    Figure 9.  Crack initiation zones of various pre-corrosion samples under median stress levels

    图 10  腐蚀形貌演变示意图

    Figure 10.  Schematic diagram of corrosion morphology

    表  1  2195-T8铝锂合金力学性能

    Table  1.   Mechanical properties of 2195-T8 Al-Li alloys

    弹性模量
    E/GPa
    屈服强度σs/MPa极限强度
    σb/MPa
    延伸率/%
    72.90583.33609.9011.4
    下载: 导出CSV

    表  2  不同预腐蚀时间下疲劳寿命

    Table  2.   Fatigue cycles under different pre-corrosion durations

    时间/h 应力/MPa 疲劳寿命/次 N50/次 σ
    0 140 867558,345447,587392 560449 0.201
    210 45680,55923,110945 65687 0.202
    280 35504,35196,31748 34106 0.027
    330 25535,19844,19068 21299 0.068
    440 9027,9630,9322 9323 0.014
    8 140 274086,624517,266834 357457 0.209
    210 92995,74407,70273 78536 0.064
    280 28399,37898,32243 32618 0.063
    330 24911,23303,20549 22849 0.042
    440 9996,10176,10012 10086 0.004
    16 140 543995,476059,533021 516813 0.031
    210 92055,74507,78209 81252 0.048
    280 49749,53557,42351 48323 0.052
    330 20723,18132,26496 21513 0.083
    440 9032,11481,13426 11166 0.087
    24 140 254628,217528,293901 253439 0.065
    210 84543,95573,110622 96328 0.058
    280 50236,49204,49803 49746 0.005
    330 24163,27778,21368 24296 0.057
    440 7611,7926,6660 5988 0.039
    下载: 导出CSV
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出版历程
  • 收稿日期:  2022-05-31
  • 录用日期:  2022-07-01
  • 网络出版日期:  2022-07-19
  • 整期出版日期:  2024-04-29

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