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Title: Changes in near-surface microstructure of metallic limiters following one year of service in Doublet III

Abstract

The structural alloys Ta-10W, Mo, and Inconel X-750 were used for plasma limiters during the 3-MW ohmic heating experiments of the Doublet III tokamak. Post-service examinations of these limiters are reviewed. Near-surface melting, cracking, and microstructural changes are shown and discussed. During III service, elements from other metallic components were transported by the plasma and deposited on the limiter surface; significantly, high concentrations of Ni, Fe, Mo, and C were detected in the regions found to be microcracked in the Ta-10W. Observations and analyses are made that are relevant to the design of limiter and armor components for larger tokamaks.

Authors:
; ;
Publication Date:
Research Org.:
General Atomic Co., San Diego, CA (USA)
OSTI Identifier:
6221056
Report Number(s):
GA-A-16429; CONF-810831-35
ON: DE81029487; TRN: 81-016433
DOE Contract Number:  
AT03-76ET51011
Resource Type:
Conference
Resource Relation:
Conference: Fusion reactor materials meeting, Seattle, WA, USA, 9 Aug 1981
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; 36 MATERIALS SCIENCE; DOUBLET REACTORS; LIMITERS; INCONEL X750; MICROSTRUCTURE; MOLYBDENUM; TANTALUM ALLOYS; TUNGSTEN ALLOYS; CRACKS; MELTING; ALLOYS; CHROMIUM ALLOYS; CRYSTAL STRUCTURE; ELEMENTS; INCONEL ALLOYS; IRON ALLOYS; METALS; NICKEL ALLOYS; NICKEL BASE ALLOYS; PHASE TRANSFORMATIONS; REFRACTORY METALS; THERMONUCLEAR REACTORS; TITANIUM ALLOYS; TOKAMAK TYPE REACTORS; TRANSITION ELEMENTS; 700209* - Fusion Power Plant Technology- Component Development & Materials Testing; 360106 - Metals & Alloys- Radiation Effects

Citation Formats

Trester, P. W., Sevier, D. L., and Sabado, M. M. Changes in near-surface microstructure of metallic limiters following one year of service in Doublet III. United States: N. p., 1981. Web.
Trester, P. W., Sevier, D. L., & Sabado, M. M. Changes in near-surface microstructure of metallic limiters following one year of service in Doublet III. United States.
Trester, P. W., Sevier, D. L., and Sabado, M. M. Sat . "Changes in near-surface microstructure of metallic limiters following one year of service in Doublet III". United States. https://www.osti.gov/servlets/purl/6221056.
@article{osti_6221056,
title = {Changes in near-surface microstructure of metallic limiters following one year of service in Doublet III},
author = {Trester, P. W. and Sevier, D. L. and Sabado, M. M.},
abstractNote = {The structural alloys Ta-10W, Mo, and Inconel X-750 were used for plasma limiters during the 3-MW ohmic heating experiments of the Doublet III tokamak. Post-service examinations of these limiters are reviewed. Near-surface melting, cracking, and microstructural changes are shown and discussed. During III service, elements from other metallic components were transported by the plasma and deposited on the limiter surface; significantly, high concentrations of Ni, Fe, Mo, and C were detected in the regions found to be microcracked in the Ta-10W. Observations and analyses are made that are relevant to the design of limiter and armor components for larger tokamaks.},
doi = {},
url = {https://www.osti.gov/biblio/6221056}, journal = {},
number = ,
volume = ,
place = {United States},
year = {1981},
month = {8}
}

Conference:
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