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Second Phase Precipitation in As-Welded and Solution Annealed Alloy 22 Welds

[+] Author Affiliations
Bassem S. El-Dasher, Sharon G. Torres

Lawrence Livermore National Laboratory, Livermore, CA

Paper No. PVP2005-71665, pp. 591-595; 5 pages
doi:10.1115/PVP2005-71665
From:
  • ASME 2005 Pressure Vessels and Piping Conference
  • Volume 7: Operations, Applications, and Components
  • Denver, Colorado, USA, July 17–21, 2005
  • Conference Sponsors: Pressure Vessels and Piping Division
  • ISBN: 0-7918-4192-8 | eISBN: 0-7918-3763-7
  • Copyright © 2005 by ASME

abstract

The precipitation characteristics of tetrahedrally close-packed (TCP) phases during the welding and the subsequent solution annealing process of Alloy 22 1 1/2” thick plate double-U prototypical welds are investigated. Electron backscatter diffraction (EBSD) was used to provide large scale microstructural observation of the weld cross section, and scanning electron microscopy (SEM) was used to map the location of the TCP phases. Analysis shows that TCP precipitation occurs congruent to the weld passes, with the solution annealing reducing the sizes of coarser precipitates.

Copyright © 2005 by ASME

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