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Effect of Thermal Aging on the Corrosion and Microstructure of Friction-Stir Welded Alloy 22

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Abstract

The effect of thermal aging on the corrosion and microstructure of friction-stir welded (FSW) alloy 22 was investigated. Successful welds were produced with a polycrystalline cubic BN pin tool at a rotational speed of 200 rev min−1 and travel speed of 12.7 mm min−1. Topologically closed packed (TCP) phases of ~50 to 300 nm size were identified in the weld nugget. The area fraction of the TCP phases in the weld nugget increased with aging temperature and time. General corrosion rates measured from the weight loss experiments for welds were relatively higher than for parent material. The corrosion rates increased with the increased aging temperature and time. Intergranular corrosion (IGC) resistance is greater in friction-stir welds compared with the parent material at all aging temperatures and times. The IGC depth increased with the aging temperature and time in the parent material. The IGC depth for the FSW weld nugget was minimal and did not change with thermal aging.

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Acknowledgments

This research was sponsored by the Army Research Laboratory and performed under Cooperative Agreement Number DAAD19-02-2-0011. The authors gratefully acknowledge Michael West and Edward Duke, South Dakota School of Mines and Technology for their support regarding the microstructural analysis. Acknowledgements are extended to Glenn Grant of Pacific Northwest National Laboratories and to Raul Rebak of General Electric for their helpful suggestions.

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Authors and Affiliations

  1. Advanced Materials Processing (AMP) Center, South Dakota School of Mines and Technology, 501 East Saint Joseph Street, Rapid City, SD, 57701, USA

    Bharat K. Jasthi (Research Scientist-III and Adjunct Faculty) & William J. Arbegast (formerly Director)

  2. Department of Materials and Metallurgical Engineering, South Dakota School of Mines and Technology, Rapid City, SD, 57701, USA

    Bharat K. Jasthi (Research Scientist-III and Adjunct Faculty) & Stanley M. Howard (Professor)

  3. NSF Center for Friction Stir Processing (CFSP), South Dakota School of Mines and Technology, Rapid City, SD, 57701, USA

    William J. Arbegast (formerly Director)

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  1. Bharat K. Jasthi
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Correspondence to Bharat K. Jasthi.

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Manuscript submitted July 21, 2011.

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Jasthi, B.K., Arbegast, W.J. & Howard, S.M. Effect of Thermal Aging on the Corrosion and Microstructure of Friction-Stir Welded Alloy 22. Metall Mater Trans A 43, 3192–3201 (2012). https://doi.org/10.1007/s11661-012-1141-5

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