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Fatigue properties of tungsten from two different processing routes

Habainy, Jemila LU ; Lövberg, Andreas; Iyengar, Srinivasan LU ; Lee, Yongjoong and Dai, Yong (2017) In Journal of Nuclear Materials
Abstract

Fatigue failure is a distinct possibility in spallation targets like tungsten, subjected to cyclic thermo-mechanical loading caused by beam trips and beam pulses. In this study, the tensile and fatigue properties of pure tungsten from two different processing routes have been determined at room temperature. The specimens tested were sintered, rolled and annealed (RA), as well as sintered and HIPed tungsten (SH).Tensile tests showed low total strain (~0.25%) and negligible plastic strain for both specimens. However, the UTS for rolled specimens (~1 GPa) was much higher relative to the HIPed material (567 MPa).As tungsten is very brittle, fatigue testing was done primarily under stress-control, using the staircase method and a near zero... (More)

Fatigue failure is a distinct possibility in spallation targets like tungsten, subjected to cyclic thermo-mechanical loading caused by beam trips and beam pulses. In this study, the tensile and fatigue properties of pure tungsten from two different processing routes have been determined at room temperature. The specimens tested were sintered, rolled and annealed (RA), as well as sintered and HIPed tungsten (SH).Tensile tests showed low total strain (~0.25%) and negligible plastic strain for both specimens. However, the UTS for rolled specimens (~1 GPa) was much higher relative to the HIPed material (567 MPa).As tungsten is very brittle, fatigue testing was done primarily under stress-control, using the staircase method and a near zero stress ratio. For the rolled and HIPed materials, fatigue limits (no specimen failure up to 2.106 load cycles) were determined to be 350 MPa and 180 MPa, respectively. In addition, results from strain-controlled multiple-step testing (strain ratio ~0) indicated a slight relaxation in stress for the HIPed material while the rolled specimens showed a purely elastic response.The implication of fatigue test results for spallation target design is discussed.

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author
organization
publishing date
type
Contribution to journal
publication status
epub
subject
keywords
Fatigue limit, Spallation material, Tungsten
in
Journal of Nuclear Materials
publisher
Elsevier
external identifiers
  • scopus:85032922163
ISSN
0022-3115
DOI
10.1016/j.jnucmat.2017.10.061
language
English
LU publication?
yes
id
96e90b97-66ab-465c-ba6d-f66fdfc9154f
date added to LUP
2017-11-16 09:47:29
date last changed
2018-01-07 12:26:01
@article{96e90b97-66ab-465c-ba6d-f66fdfc9154f,
  abstract     = {<p>Fatigue failure is a distinct possibility in spallation targets like tungsten, subjected to cyclic thermo-mechanical loading caused by beam trips and beam pulses. In this study, the tensile and fatigue properties of pure tungsten from two different processing routes have been determined at room temperature. The specimens tested were sintered, rolled and annealed (RA), as well as sintered and HIPed tungsten (SH).Tensile tests showed low total strain (~0.25%) and negligible plastic strain for both specimens. However, the UTS for rolled specimens (~1 GPa) was much higher relative to the HIPed material (567 MPa).As tungsten is very brittle, fatigue testing was done primarily under stress-control, using the staircase method and a near zero stress ratio. For the rolled and HIPed materials, fatigue limits (no specimen failure up to 2.10<sup>6</sup> load cycles) were determined to be 350 MPa and 180 MPa, respectively. In addition, results from strain-controlled multiple-step testing (strain ratio ~0) indicated a slight relaxation in stress for the HIPed material while the rolled specimens showed a purely elastic response.The implication of fatigue test results for spallation target design is discussed.</p>},
  author       = {Habainy, Jemila and Lövberg, Andreas and Iyengar, Srinivasan and Lee, Yongjoong and Dai, Yong},
  issn         = {0022-3115},
  keyword      = {Fatigue limit,Spallation material,Tungsten},
  language     = {eng},
  month        = {10},
  publisher    = {Elsevier},
  series       = {Journal of Nuclear Materials},
  title        = {Fatigue properties of tungsten from two different processing routes},
  url          = {http://dx.doi.org/10.1016/j.jnucmat.2017.10.061},
  year         = {2017},
}