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Evolution of Microstructure and Stress Corrosion Cracking Behavior of AA2219 Plate to Ring Weld Joints in 3.5 Wt Pct NaCl Solution

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Abstract

AA2219 aluminum alloy plate (T87) and ring (T851) were joined by tungsten inert gas (TIG) welding using multi-pass welding. The mechanical properties and stress corrosion cracking (SCC) resistance of the above base metals (BMs) in different directions (L, LT, and ST) were examined. Similarly, the weld metal joined by plate to plate and plate to ring (PR) joints was evaluated. The results revealed that the mechanical properties of the ring were comparatively lower than the plate. This was found to be due to the extremely coarse grain size of the ring along with severe Cu-rich segregation along the grain boundaries when compared to the plate material. The SCC resistance of the base and weldments were found to be good and not susceptible to SCC. This was shown to be due to high values of SCC index (>0.9) and the typical ductile cracking morphology of the BM and the weld joints after SCC test in the environment (3.5 wt pct NaCl) when compared to test performed in the control environment (air). However, the corrosion resistance of the weld interface between the FZ and ring was inferior to the FZ–plate interface.

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Acknowledgment

The authors are grateful to the Deputy Director, (MME) VSSC for the interest and encouragement given throughout the work. The authors are thankful to Director (VSSC) for granting permission to publish the work.

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Authors and Affiliations

  1. Materials Characterisation Division, Materials and Metallurgy Group, Materials and Mechanical Entity, Vikram Sarabhai Space Centre, Thiruvananthapuram, 695 022, India

    A. Venugopal (Scientist-SF), P. Ramesh Narayanan (Head) & S. C. Sharma (Group Director)

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  1. A. Venugopal
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  2. P. Ramesh Narayanan
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  3. S. C. Sharma
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Correspondence to A. Venugopal.

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Manuscript submitted July 15, 2015.

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Venugopal, A., Narayanan, P.R. & Sharma, S.C. Evolution of Microstructure and Stress Corrosion Cracking Behavior of AA2219 Plate to Ring Weld Joints in 3.5 Wt Pct NaCl Solution. Metall Mater Trans A 47, 1607–1620 (2016). https://doi.org/10.1007/s11661-016-3332-y

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