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Fatigue crack growth of AA2219 under different aging conditions

机译：不同时效条件下AA2219的疲劳裂纹扩展

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摘要

The fatigue crack growth of commercial AA2229 has been examined under different aging treatments, namely, naturally aged (NA), under aged (UA), peak aged (PA) and over aged (OA) conditions. From the near threshold stress intensity range (△K_(NTH)). the alloy in the NA condition is found to have the highest resistance to fatigue crack initiation. The crack growth rate increases and the near threshold stress intensity range decreases with advancing aging. This observation is found to be consistent with lower levels of crack closure and decreasing levels of tortuosity in crack path for PA and OA tempers. The inhomogeneous transcrystalline slip in the UA condition results in the slower crack growth at low stress intensity range (△K). The fracture morphology changes from crystallographic facets near the threshold region to clearly developed ductile striations in the Paris power-law regime to microvoid coalescence in the high AK regions.
机译：已经在不同的时效处理下检查了商业AA2229的疲劳裂纹扩展，这些时效处理包括自然老化（NA），老化（UA），高峰老化（PA）和老化（OA）条件。从接近阈值应力强度范围（△K_（NTH））开始。发现在NA条件下的合金具有最高的抗疲劳裂纹萌生能力。随着时效的发展，裂纹扩展速率增加，接近极限应力强度范围减小。发现该观察结果与PA和OA回火的较低的裂纹闭合水平和降低的裂纹路径中的曲折度一致。 UA条件下不均匀的跨晶滑移导致低应力强度范围（△K）时裂纹扩展较慢。断裂形态从阈值区域附近的晶体学小面变化到巴黎幂律制度中清晰发展的延展性条纹，到高AK区域中的微空隙合并。

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  • 来源
    《Materials Science and Engineering》 |2011年第12期|p.4040-4049|共10页
  • 作者

    V.M.J. Sharma; K. Sree Kumar; B. Nageswara Rao; S.D. Pathak;

  • 作者单位

    Material Characterisation Division, Materials and Metallurgy Group, Vikram Sarabhai Space Centre, Trivandrum 695 022, India;

    Material Characterisation Division, Materials and Metallurgy Group, Vikram Sarabhai Space Centre, Trivandrum 695 022, India;

    Structural Analysis and Testing Group, Vikram Sarabhai Space Centre, Veli Research Complex, Indian Space Research Organisation, Trivandrum 695 022, India;

    Department of Metallurgical and Materials Engineering, Indian Institute of Technology Madras, Chennai 600 036, India;

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  • 关键词

    fatigue crack growth aging aluminum alloys striations threshold stress intensity range;

    机译：疲劳裂纹扩展时效铝合金条纹阈值应力强度范围;

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