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Title: The Effect of Solution Annealing on the Microstructural Behavior of Alloy 22 Welds

Abstract

Multi-pass gas tungsten arc welds of Alloy 22 were subjected to solution annealing durations of 20 minutes, 24 hours, 72 hours and 1 week at temperatures of 1075, 1121, 1200, and 1300 C. The specimens were studied in cross section by secondary electron microscopy to determine the effect of solution annealing on tetrahedrally close packed (TCP) precipitate stability. Electron backscatter diffraction mapping was also performed on all of the specimens to determine the recrystallization behavior of the welds. It was found that complete TCP precipitate dissolution occurs after solution annealing at 1075 C and 1121 C for 24 hours, and at 1200 C and 1300 C for durations of 20 minutes. Regions of most rapid recrystallization were correlated to the regions of lowest solute content and highest residual tensile stresses. Texture analysis indicated that while the columnar dendrites originally present in the weld grew with a <001> orientation in the transverse direction (opposite the heat flow direction), the recrystallized grains adopt a <101> orientation in the transverse direction when recrystallization and TCP phase dissolution occur simultaneously.

Authors:
; ;
Publication Date:
Research Org.:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
881879
Report Number(s):
UCRL-JRNL-212170
TRN: US0603026
DOE Contract Number:  
W-7405-ENG-48
Resource Type:
Journal Article
Journal Name:
Metallurgical and Materials Transactions A
Additional Journal Information:
Journal Volume: 37A
Country of Publication:
United States
Language:
English
Subject:
12 MANAGEMENT OF RADIOACTIVE WASTES, AND NON-RADIOACTIVE WASTES FROM NUCLEAR FACILITIES; 36 MATERIALS SCIENCE; ALLOYS; ANNEALING; CROSS SECTIONS; DENDRITES; DIFFRACTION; DISSOLUTION; ELECTRON MICROSCOPY; ELECTRONS; HEAT FLUX; ORIENTATION; RECRYSTALLIZATION; SOLUTES; STABILITY; STRESSES; TEXTURE; TUNGSTEN

Citation Formats

El-Dasher, B S, Edgecumbe, T S, and Torres, S G. The Effect of Solution Annealing on the Microstructural Behavior of Alloy 22 Welds. United States: N. p., 2005. Web.
El-Dasher, B S, Edgecumbe, T S, & Torres, S G. The Effect of Solution Annealing on the Microstructural Behavior of Alloy 22 Welds. United States.
El-Dasher, B S, Edgecumbe, T S, and Torres, S G. Fri . "The Effect of Solution Annealing on the Microstructural Behavior of Alloy 22 Welds". United States. https://www.osti.gov/servlets/purl/881879.
@article{osti_881879,
title = {The Effect of Solution Annealing on the Microstructural Behavior of Alloy 22 Welds},
author = {El-Dasher, B S and Edgecumbe, T S and Torres, S G},
abstractNote = {Multi-pass gas tungsten arc welds of Alloy 22 were subjected to solution annealing durations of 20 minutes, 24 hours, 72 hours and 1 week at temperatures of 1075, 1121, 1200, and 1300 C. The specimens were studied in cross section by secondary electron microscopy to determine the effect of solution annealing on tetrahedrally close packed (TCP) precipitate stability. Electron backscatter diffraction mapping was also performed on all of the specimens to determine the recrystallization behavior of the welds. It was found that complete TCP precipitate dissolution occurs after solution annealing at 1075 C and 1121 C for 24 hours, and at 1200 C and 1300 C for durations of 20 minutes. Regions of most rapid recrystallization were correlated to the regions of lowest solute content and highest residual tensile stresses. Texture analysis indicated that while the columnar dendrites originally present in the weld grew with a <001> orientation in the transverse direction (opposite the heat flow direction), the recrystallized grains adopt a <101> orientation in the transverse direction when recrystallization and TCP phase dissolution occur simultaneously.},
doi = {},
url = {https://www.osti.gov/biblio/881879}, journal = {Metallurgical and Materials Transactions A},
number = ,
volume = 37A,
place = {United States},
year = {2005},
month = {5}
}