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Long-Term Immersion Testing of Alloy 22 and Titanium Grade 7 Double U-Bend Specimens

[+] Author Affiliations
Kenneth J. Evans, Marshall L. Stuart, Phillip D. Hailey, Raul B. Rebak

Lawrence Livermore National Laboratory, Livermore, CA

Paper No. PVP2007-26163, pp. 405-412; 8 pages
doi:10.1115/PVP2007-26163
From:
  • ASME 2007 Pressure Vessels and Piping Conference
  • Volume 7: Operations, Applications and Components
  • San Antonio, Texas, USA, July 22–26, 2007
  • Conference Sponsors: Pressure Vessels and Piping Division
  • ISBN: 0-7918-4285-1 | eISBN: 0-7918-3804-8

abstract

Double U-bend specimens of Alloy 22 (N06022) and Titanium Grade 7 (R52400) were exposed to a naturally aerated concentrated Basic Saturated Water (BSW) electrolyte at 105°C for over six years. Different type of discoloration of the Ti Gr 7 and Alloy 22 specimens was observed. General Corrosion was minimal and not distinguishable under a scanning electron microscope. None of the tested specimens suffered environmentally assisted cracking (EAC) or localized corrosion under the tested conditions. The specimens retained their residual stress after the long environmental exposure.

Topics: Alloys , Testing , Titanium

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