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Title: Weld repair of irradiated materials

Abstract

Maintenance of an accelerator for production of tritium will require replacement or modification of components that have been exposed to neutron irradiation. A primary repair option is welding, but conventional repair welding processes produced severe cracking in irradiated stainless steel. Optical metallography, scanning electron microscopy, and transmission electron microscopy have shown that the cracks are: intergranular, primarily in the weld heat-affected zone, characterized by a dimple structure on the crack surface, and associated with helium bubbles that grow during welding. A model has been developed that qualitatively shows the interaction of three primary and three secondary variables producing helium embrittlement cracking. A shallow penetration overlay technique was successfully demonstrated to minimize cracking in irradiated 304 stainless steel that contained 10 appm helium. The overlay technique provides a potential method for repair or modification of accelerator materials exposed to irradiation.

Authors:
; ; ;
Publication Date:
Research Org.:
Savannah River Technology Center, Aiken, SC (US)
Sponsoring Org.:
USDOE
OSTI Identifier:
20020759
DOE Contract Number:  
AC09-96SR18500
Resource Type:
Journal Article
Journal Name:
Materials Characterization
Additional Journal Information:
Journal Volume: 43; Journal Issue: 2-3; Other Information: PBD: Aug-Sep 1999; Journal ID: ISSN 1044-5803
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 43 PARTICLE ACCELERATORS; 45 MILITARY TECHNOLOGY, WEAPONRY, AND NATIONAL DEFENSE; REPAIR; LINEAR ACCELERATORS; TRITIUM; ISOTOPE PRODUCTION; PHYSICAL RADIATION EFFECTS; WELDING; CRACKS; HEAT AFFECTED ZONE; HELIUM EMBRITTLEMENT

Citation Formats

Kanne, W.R. Jr., Louthan, M.R. Jr., Rankin, D.T., and Tosten, M.H. Weld repair of irradiated materials. United States: N. p., 1999. Web. doi:10.1016/S1044-5803(99)00032-7.
Kanne, W.R. Jr., Louthan, M.R. Jr., Rankin, D.T., & Tosten, M.H. Weld repair of irradiated materials. United States. doi:10.1016/S1044-5803(99)00032-7.
Kanne, W.R. Jr., Louthan, M.R. Jr., Rankin, D.T., and Tosten, M.H. Wed . "Weld repair of irradiated materials". United States. doi:10.1016/S1044-5803(99)00032-7.
@article{osti_20020759,
title = {Weld repair of irradiated materials},
author = {Kanne, W.R. Jr. and Louthan, M.R. Jr. and Rankin, D.T. and Tosten, M.H.},
abstractNote = {Maintenance of an accelerator for production of tritium will require replacement or modification of components that have been exposed to neutron irradiation. A primary repair option is welding, but conventional repair welding processes produced severe cracking in irradiated stainless steel. Optical metallography, scanning electron microscopy, and transmission electron microscopy have shown that the cracks are: intergranular, primarily in the weld heat-affected zone, characterized by a dimple structure on the crack surface, and associated with helium bubbles that grow during welding. A model has been developed that qualitatively shows the interaction of three primary and three secondary variables producing helium embrittlement cracking. A shallow penetration overlay technique was successfully demonstrated to minimize cracking in irradiated 304 stainless steel that contained 10 appm helium. The overlay technique provides a potential method for repair or modification of accelerator materials exposed to irradiation.},
doi = {10.1016/S1044-5803(99)00032-7},
journal = {Materials Characterization},
issn = {1044-5803},
number = 2-3,
volume = 43,
place = {United States},
year = {1999},
month = {9}
}