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首页> 外文期刊>Metallurgical and Materials Transactions A >Effect of Repair Welding on Electrochemical Corrosion and Stress Corrosion Cracking Behavior of TIG Welded AA2219 Aluminum Alloy in 3.5 Wt Pct NaCl Solution
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Effect of Repair Welding on Electrochemical Corrosion and Stress Corrosion Cracking Behavior of TIG Welded AA2219 Aluminum Alloy in 3.5 Wt Pct NaCl Solution

机译：补焊对3.5 Wt Pct NaCl溶液中TIG焊接AA2219铝合金的电化学腐蚀和应力腐蚀开裂行为的影响

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摘要

The stress corrosion cracking (SCC) behavior of AA2219 aluminum alloy in the as-welded (AW) and repair-welded (RW) conditions was examined and compared with that of the base metal (BM) in 3.5 wt pct NaCl solution using the slow strain rate technique (SSRT). The reduction in ductility was used as a parameter to evaluate the SCC susceptibility of both BM and welded joints. The results show that the ductility ratio (ε NaCl/(ε air)) of the BM was close to one (0.97) and reduced to 0.9 for the AW joint. This value further reduced to 0.77 after carrying out one repair welding operation. However, the RW specimen exhibited higher ductility than the single-weld specimens even in 3.5 wt pct NaCl solution. SSRT results obtained using pre-exposed samples followed by post-test metallographic observations clearly showed localized pitting corrosion along the partially melted zone (PMZ), signifying that the reduction in ductility ratio of both the AW and RW joints was more due to mechanical overload failure, caused by the localized corrosion and a consequent reduction in specimen thickness, than due to SCC. Also, the RW joint exhibited higher ductility than the AW joint both in air and the environment, although SCC index (SI) for the former is lower than that of the latter. Fractographic examination of the failed samples, in general, revealed a typical ductile cracking morphology for all the base and welded joints, indicating the good environmental cracking resistance of this alloy. Microstructural examination and polarization tests further demonstrate grain boundary melting along the PMZ, and that provided the necessary electrochemical condition for the preferential cracking on that zone of the weldment.
机译：检查了AA2219铝合金在焊接（AW）和补焊（RW）条件下的应力腐蚀开裂（SCC）行为，并使用慢熔剂与3.5 wt％NaCl溶液中的贱金属（BM）进行了比较应变率技术（SSRT）。延展性的降低被用作评估BM和焊接接头的SCC敏感性的参数。结果表明，BM的延展性比（εNaCl /（εair ））接近1（0.97），而AW接头降低到0.9。在执行一次修补焊接操作后，该值进一步降低到0.77。但是，即使在3.5 wt％的NaCl溶液中，RW样品也比单焊缝样品表现出更高的延展性。使用预先暴露的样品，然后进行测试后的金相观察获得的SSRT结果清楚地表明，沿部分熔融区（PMZ）的局部点蚀是腐蚀现象，这表明AW和RW接头的延性比的降低更多是由于机械过载故障造成的，这是由于局部腐蚀和试样厚度的减小所致，而不是由SCC引起的。此外，尽管前者的SCC指数（SI）低于后者，但RW接头在空气和环境中均表现出比AW接头更高的延展性。断裂样品的断口检查通常显示出所有基础和焊接接头的典型延性开裂形态，表明该合金具有良好的耐环境开裂性。显微组织检查和极化测试进一步证明了沿PMZ的晶界熔化，这为焊件该区域的优先裂纹提供了必要的电化学条件。

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  • 来源
    《Metallurgical and Materials Transactions A》 |2010年第12期|p.3151-3160|共10页
  • 作者

    A. Venugopal; K. Sreekumar; V.S. Raja;

  • 作者单位

    Material Characterisation Division, Vikram Sarabhai Space Centre, Thiruvananthapuram, 695 022, India;

    Material Characterisation Division, Vikram Sarabhai Space Centre, Thiruvananthapuram, 695 022, India;

    Department of Metallurgical Engineering and Materials Science, Indian Institute of Technology Bombay, Powai, Mumbai, 400 076, India;

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