skip to main content
DOE PAGES title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Surface morphology of Tungsten-F82H after high-heat flux testing using plasma-arc lamps

Abstract

F82H reduced activation steel coated with vacuum plasma sprayed (VPS) tungsten is a candidate as a plasma facing material for main chamber components in future fusion reactors. Due to different coefficients of thermal expansion (CTE), significant thermal stresses are expected in these bimetallic materials. Thus, a major uncertainty in the performance of W/F82H components during the operation under high-heat fluxes is the effect of CTE mismatch. Here in this study, a high intensity plasma-arc lamp was used for high-heat flux cycling tests of W/F82H specimens. While no surface damage was observed for specimens tested for 100–200 cycles at a heat flux of 1.4 MW/m2 pulse when the backside surface temperature was maintained below 550 °C, significant cracking occurred at higher temperatures. A simple analytical model for bimetallic materials indicated that the stress in the VPS-W layer is likely to exceed its failure stress solely due to the bilayer thermal stress. Finally, a finite element analysis of the state of stress and deformation confirmed that a significant stress also would occur at the W surface due to the rigid-body like constraint imposed by the clamp, which can be the main cause of the cracking.

Authors:
; ORCiD logo; ; ; ; ; ORCiD logo;
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
1458574
Alternate Identifier(s):
OSTI ID: 1460222
Grant/Contract Number:  
AC05-00OR22725
Resource Type:
Published Article
Journal Name:
Nuclear Materials and Energy
Additional Journal Information:
Journal Name: Nuclear Materials and Energy Journal Volume: 16 Journal Issue: C; Journal ID: ISSN 2352-1791
Publisher:
Elsevier
Country of Publication:
Netherlands
Language:
English
Subject:
36 MATERIALS SCIENCE; 70 PLASMA PHYSICS AND FUSION TECHNOLOGY; High-heat flux testing; Thermal stress; Bimetallic; Tungsten; Reduced activation steel

Citation Formats

Ibano, K., Sabau, A. S., Tokunaga, K., Akiyoshi, M., Kiggans, J. O., Schaich, C. R., Katoh, Y., and Ueda, Y. Surface morphology of Tungsten-F82H after high-heat flux testing using plasma-arc lamps. Netherlands: N. p., 2018. Web. https://doi.org/10.1016/j.nme.2018.06.015.
Ibano, K., Sabau, A. S., Tokunaga, K., Akiyoshi, M., Kiggans, J. O., Schaich, C. R., Katoh, Y., & Ueda, Y. Surface morphology of Tungsten-F82H after high-heat flux testing using plasma-arc lamps. Netherlands. https://doi.org/10.1016/j.nme.2018.06.015
Ibano, K., Sabau, A. S., Tokunaga, K., Akiyoshi, M., Kiggans, J. O., Schaich, C. R., Katoh, Y., and Ueda, Y. Wed . "Surface morphology of Tungsten-F82H after high-heat flux testing using plasma-arc lamps". Netherlands. https://doi.org/10.1016/j.nme.2018.06.015.
@article{osti_1458574,
title = {Surface morphology of Tungsten-F82H after high-heat flux testing using plasma-arc lamps},
author = {Ibano, K. and Sabau, A. S. and Tokunaga, K. and Akiyoshi, M. and Kiggans, J. O. and Schaich, C. R. and Katoh, Y. and Ueda, Y.},
abstractNote = {F82H reduced activation steel coated with vacuum plasma sprayed (VPS) tungsten is a candidate as a plasma facing material for main chamber components in future fusion reactors. Due to different coefficients of thermal expansion (CTE), significant thermal stresses are expected in these bimetallic materials. Thus, a major uncertainty in the performance of W/F82H components during the operation under high-heat fluxes is the effect of CTE mismatch. Here in this study, a high intensity plasma-arc lamp was used for high-heat flux cycling tests of W/F82H specimens. While no surface damage was observed for specimens tested for 100–200 cycles at a heat flux of 1.4 MW/m2 pulse when the backside surface temperature was maintained below 550 °C, significant cracking occurred at higher temperatures. A simple analytical model for bimetallic materials indicated that the stress in the VPS-W layer is likely to exceed its failure stress solely due to the bilayer thermal stress. Finally, a finite element analysis of the state of stress and deformation confirmed that a significant stress also would occur at the W surface due to the rigid-body like constraint imposed by the clamp, which can be the main cause of the cracking.},
doi = {10.1016/j.nme.2018.06.015},
journal = {Nuclear Materials and Energy},
number = C,
volume = 16,
place = {Netherlands},
year = {2018},
month = {8}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record
https://doi.org/10.1016/j.nme.2018.06.015

Citation Metrics:
Cited by: 1 work
Citation information provided by
Web of Science

Save / Share:

Works referencing / citing this record:

A 6 MW/m 2 High Heat Flux Testing Facility of Irradiated Materials Using Infrared Plasma-Arc Lamps
journal, June 2019

  • Sabau, Adrian S.; Tokunaga, Kazutoshi; Littleton, Michael G.
  • Fusion Science and Technology, Vol. 75, Issue 7
  • DOI: 10.1080/15361055.2019.1623571