Initial characterization of V-4Cr-4Ti and MHD coatings exposed to flowing Li

B. A. Pint; S. J. Pawel; M. Howell; J. L. Moser; G. W. Garner; M. L. Santella; P. F. Tortorelli; F. W. Wiffen; J. R. DiStefano

doi:10.1016/j.jnucmat.2008.12.295

Initial characterization of V-4Cr-4Ti and MHD coatings exposed to flowing Li

B. A. Pint, S. J. Pawel, M. Howell, J. L. Moser, G. W. Garner, M. L. Santella, P. F. Tortorelli, F. W. Wiffen, J. R. DiStefano

Materials Science and Technology Div

Research output: Contribution to journal › Article › peer-review

27 Scopus citations

Abstract

A mono-metallic V-4Cr-4Ti thermal convection loop was operated in vacuum (∼10^-5 Pa) at a maximum Li temperature of 700 °C for 2355 h and Li flow rate of 2-3 cm/s. Two-layer, physical vapor deposited Y₂O₃-vanadium, electrically insulating coatings on V-4Cr-4Ti substrates as well as tensile and sheet specimens were located in the flow path in the hot and cold legs. After exposure, specimens at the top of the hot leg showed a maximum mass loss equivalent to ∼1.3 μm of metal loss. Elsewhere, small mass gains were observed on the majority of specimens resulting in an increase in hardness and room temperature yield stress and a decrease in ductility consistent with the observed uptake of N and C from the Li. Specimens that lost mass showed a decrease in yield stress and hardness. Profilometry showed no significant thickness loss from the coatings.

Original language	English
Pages (from-to)	712-715
Number of pages	4
Journal	Journal of Nuclear Materials
Volume	386-388
Issue number	C
DOIs	https://doi.org/10.1016/j.jnucmat.2008.12.295
State	Published - Apr 30 2009

Funding

This research was sponsored by the Office of Fusion Energy Sciences, US Department of Energy (DOE), under contract DE-AC05-00OR22725 with UT-Battelle, LLC and the JUPITER-II Japan-US collaboration on fusion blanket systems and materials. T. Brummett, R. Parten and H. Longmire assisted with the experimental work. D.F. Wilson, M. Li, S.J. Zinkle and R. Stoller provided comments on the manuscript.

Funders	Funder number
U.S. Department of Energy	DE-AC05-00OR22725
Fusion Energy Sciences

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title = "Initial characterization of V-4Cr-4Ti and MHD coatings exposed to flowing Li",

abstract = "A mono-metallic V-4Cr-4Ti thermal convection loop was operated in vacuum (∼10-5 Pa) at a maximum Li temperature of 700 °C for 2355 h and Li flow rate of 2-3 cm/s. Two-layer, physical vapor deposited Y2O3-vanadium, electrically insulating coatings on V-4Cr-4Ti substrates as well as tensile and sheet specimens were located in the flow path in the hot and cold legs. After exposure, specimens at the top of the hot leg showed a maximum mass loss equivalent to ∼1.3 μm of metal loss. Elsewhere, small mass gains were observed on the majority of specimens resulting in an increase in hardness and room temperature yield stress and a decrease in ductility consistent with the observed uptake of N and C from the Li. Specimens that lost mass showed a decrease in yield stress and hardness. Profilometry showed no significant thickness loss from the coatings.",

author = "Pint, {B. A.} and Pawel, {S. J.} and M. Howell and Moser, {J. L.} and Garner, {G. W.} and Santella, {M. L.} and Tortorelli, {P. F.} and Wiffen, {F. W.} and DiStefano, {J. R.}",

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AU - Pint, B. A.

AU - Pawel, S. J.

AU - Howell, M.

AU - Moser, J. L.

AU - Garner, G. W.

AU - Santella, M. L.

AU - Tortorelli, P. F.

AU - Wiffen, F. W.

AU - DiStefano, J. R.

PY - 2009/4/30

Y1 - 2009/4/30

N2 - A mono-metallic V-4Cr-4Ti thermal convection loop was operated in vacuum (∼10-5 Pa) at a maximum Li temperature of 700 °C for 2355 h and Li flow rate of 2-3 cm/s. Two-layer, physical vapor deposited Y2O3-vanadium, electrically insulating coatings on V-4Cr-4Ti substrates as well as tensile and sheet specimens were located in the flow path in the hot and cold legs. After exposure, specimens at the top of the hot leg showed a maximum mass loss equivalent to ∼1.3 μm of metal loss. Elsewhere, small mass gains were observed on the majority of specimens resulting in an increase in hardness and room temperature yield stress and a decrease in ductility consistent with the observed uptake of N and C from the Li. Specimens that lost mass showed a decrease in yield stress and hardness. Profilometry showed no significant thickness loss from the coatings.

AB - A mono-metallic V-4Cr-4Ti thermal convection loop was operated in vacuum (∼10-5 Pa) at a maximum Li temperature of 700 °C for 2355 h and Li flow rate of 2-3 cm/s. Two-layer, physical vapor deposited Y2O3-vanadium, electrically insulating coatings on V-4Cr-4Ti substrates as well as tensile and sheet specimens were located in the flow path in the hot and cold legs. After exposure, specimens at the top of the hot leg showed a maximum mass loss equivalent to ∼1.3 μm of metal loss. Elsewhere, small mass gains were observed on the majority of specimens resulting in an increase in hardness and room temperature yield stress and a decrease in ductility consistent with the observed uptake of N and C from the Li. Specimens that lost mass showed a decrease in yield stress and hardness. Profilometry showed no significant thickness loss from the coatings.

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M3 - Article

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SN - 0022-3115

VL - 386-388

SP - 712

EP - 715

JO - Journal of Nuclear Materials

JF - Journal of Nuclear Materials

IS - C

ER -

Initial characterization of V-4Cr-4Ti and MHD coatings exposed to flowing Li

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