Experimental and computational study of damage behavior of tungsten under high energy electron beam irradiation

Li, Muyuan; Sommerer, Mathias; Werner, Ewald; Lampenscherf, Stefan; Steinkopff, Th.; Wolfrum, Philipp; You, J.-H.

doi:10.1016/j.engfracmech.2015.01.017

Cited by 14 publications

(9 citation statements)

References 16 publications

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“…recrystallization, dislocation reorganization, grain growth etc.). The HEFTY facility can be used for studies of thermal shock [15,16,17], thermomechanical fatigue, and fatigue-creep interactions. The system is controlled via a LabView program, thus allowing controlled pulsed operation capabilities.…”

Section: Q''mentioning

confidence: 99%

Experimental measurements of surface damage and residual stresses in micro-engineered plasma facing materials

Rivera

Wirz

Ghoniem

2017

Journal of Nuclear Materials

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The thermomechanical damage in plasma-facing materials operating at high heat flux is investigated. Materials with micro-surfaces are found to be more resilient, when exposed to cyclic high heat flux generated by an arc-jet plasma. An experimental facility, dedicated to High Energy Flux Testing (HEFTY), is developed for testing cyclic heat flux in excess of 10 MW/m 2. We show that plastic deformation and subsequent fracture of the surface can be controlled by sample cooling. We demonstrate that W surfaces with micro-pillar type surface architecture have significantly reduced residual thermal stresses after plasma exposure, as compared to those with flat surfaces. X-ray diffraction (XRD) spectra of the W-(110) peak reveal that broadening of the Full Width at Half Maximum (FWHM) for micro-engineered samples is substantially smaller than corresponding flat surfaces. Spectral shifts of XRD signals indicate that residual stresses due to plasma exposure of micro-engineered surfaces build up in the first few cycles of exposure. Subsequent cyclic plasma heat loading is shown to anneal out most of the built-up residual stresses in micro-engineered surfaces. These findings are consistent with relaxation of residual thermal stresses in surfaces with micro-engineered features. The initial residual stress state of highly polished flat W samples is compressive (≈-1.3 GPa). After exposure to 50 plasma cycles, the surface stress relaxes to-1.0 GPa. Micro-engineered samples exposed to the same thermal cycling show that the initial residual stress state is compressive at (-250 MPa), and remains largely unchanged after plasma exposure.

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Section: Q''mentioning

confidence: 99%

Experimental measurements of surface damage and residual stresses in micro-engineered plasma facing materials

Rivera

Wirz

Ghoniem

2017

Journal of Nuclear Materials

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“…Measured absorption coefficients of tungsten between 0.48 and 0.66 are discussed in literature [7,21,29,30].…”

Section: Thermal Shock Testmentioning

confidence: 99%

“…Because the peak temperatures in the focal spot could not be measured in the thermal shock test facility it was calculated numerically for W-TC and W-ST by Li et al [29]. The calculated peak temperature as a function of the absorbed power density is shown in Fig.…”

Section: Thermo-cyclic Behaviormentioning

confidence: 99%

“…The recrystallization behavior of W-TC and W-ST differs strongly. The thermal shock experiment generates high stresses [29] and strain rates during the first microseconds of the beam pulse ( Fig. 17) in the material due to the steep increase of the surface temperature and the related thermal expansion of the material.…”

Section: Modification Of the Microstructure During Thermal Loadingmentioning

confidence: 99%

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Tape cast isotropic, fine-grained tungsten for thermo-cyclic loading applications

Sommerer

Werner

et al. 2016

Fusion Engineering and Design

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This paper introduces tape casting as a new route for the production of isotropic and fine-grained tungsten components. Microstructural and thermal properties of tape cast tungsten samples are determined. Thermal shock behavior according to the thermo-cyclic loading of standing X-ray anodes is investigated and compared to the behavior of a rolled tungsten grade. The development of surface roughness during the thermal shock loading is discussed in relation to the development of the grain structure and crack pattern. The finegrained and stable microstructure of the tape cast material exhibits less roughening under such test conditions.

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“…To sum up, electron beam is an effective method to simulate powerful pulsed Xray [16][17][18][19][20]. However, it is necessary to study the equivalence of the above two for the thermodynamic effects caused by the radiation mechanism difference between them.…”

Section: Introductionmentioning

confidence: 99%

The Blow-Off Impulse Equivalence of Typical Missile Homogeneous Al-Alloy under Multienergy Composite Spectrum Electron Beam and Powerful Pulsed X-ray

et al. 2021

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The electron beam, one of the most effective approaches to simulate the irradiation effects of powerful pulsed X-ray in the laboratory, plays an important role in simulating the thermodynamic effects of powerful pulsed X-ray. This paper studies the thermodynamics equivalence between multienergy composite spectrum electron beam and blackbody spectrum X-ray, which is helpful to quickly determine the experimental parameters in the simulation experiment. The experimental data of electron beam are extrapolated by numerical calculation, to increase the range of energy flux. Through calculating the blow-off impulse of blackbody spectrum X-ray irradiation, we obtained the curve of X-ray blow-off impulse varying with energy flux, and then found two categories of equivalent relations—equal-energy flux and equal-impulse—by analyzing the calculation results of electron beam and X-ray blow-off impulse. Based on such relations, we could directly or indirectly obtain the results of blackbody spectrum X-ray irradiation blow-off impulse via electron beam experiment.

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Experimental and computational study of damage behavior of tungsten under high energy electron beam irradiation

Cited by 14 publications

References 16 publications

Experimental measurements of surface damage and residual stresses in micro-engineered plasma facing materials

Experimental measurements of surface damage and residual stresses in micro-engineered plasma facing materials

Tape cast isotropic, fine-grained tungsten for thermo-cyclic loading applications

The Blow-Off Impulse Equivalence of Typical Missile Homogeneous Al-Alloy under Multienergy Composite Spectrum Electron Beam and Powerful Pulsed X-ray

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