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RESEARCH PAPERS

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

[+] Author and Article Information
Bassem S. El-Dasher, Sharon G. Torres

 Lawrence Livermore National Laboratory, 7000 East Avenue, L-631, Livermore, CA 94550

J. Pressure Vessel Technol 128(4), 644-647 (Jan 27, 2006) (4 pages) doi:10.1115/1.2349578 History: Received August 29, 2005; Revised January 27, 2006

The precipitation characteristics of tetrahedrally close-packed (TCP) phases during the welding and the subsequent solution annealing process of Alloy 22 1 12in. thick plate double-U prototypical welds are investigated. Electron backscatter diffraction was used to provide large scale microstructural observation of the weld cross section, and scanning electron microscopy 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.

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Copyright © 2006 by American Society of Mechanical Engineers
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Figures

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Figure 1

Schematic of weld cross-sectional area examined (arrow)

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Figure 2

Typical backscatter electron SEM image of the fusion zone. The TCP phase precipitates appear as white.

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Figure 3

Collage of the fusion zone of the as-welded specimen formed by joining 880 SEM backscatter micrographs. The white box represents the approximate area characterized using EBSD.

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Figure 4

Collage of the fusion zone of the solution annealed (1121°C for 20min) specimen formed by joining 880 SEM backscatter micrographs. The white box represents the approximate area characterized using EBSD.

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Figure 5

EBSD micrograph of the fusion zone of the as-welded specimen

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Figure 6

EBSD micrograph of the fusion zone of the solution annealed (1121°C for 20min) specimen. Arrows indicate recrystallized regions.

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Figure 7

Collage of thresholded backscatter SEM images showing the TCP phase precipitate distribution in the fusion zone of the as-welded specimen

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Figure 8

Collage of thresholded backscatter SEM images showing the TCP phase precipitate distribution in the fusion zone of the solution annealed (1121°C for 20min) specimen. Arrows indicate recrystallized regions.

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Figure 9

TCP phase precipitate size distribution in the as-welded and solution annealed (1121°C for 20min) specimen

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