Theoretical investigation of crack formation in tungsten after heat loads

Arakcheev, A. S.; Huber, A.; Wirtz, M.; Sergienko, G.; Steudel, I.; Burdakov, A. V.; Coenen, J. W.; Kreter, A.; Linke, J.; Mertens, Philippe; Shoshin, A. A.; Unterberg, B.; Vasilyev, Aleksey

doi:10.1016/j.jnucmat.2014.10.090

Cited by 29 publications

(14 citation statements)

References 6 publications

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“…The following three conditions will be sufficient for explanation of the crack formation: 1) the target temperature exceeds the ductile-to-brittle transition temperature; 2) the maximum value of plastic stress exceeds the ultimate tensile strength; 3) the initial temperature of the target is less than the material-specific threshold. The numerical results of the model demonstrate good agreement with experimental data obtained at the JUDITH-1, PSI-2 and GOL-3 facilities [11], [18]. Experiments show that major cracks (cell size of 1000 µm) are attributed to the ductileto-brittle transition during cooling stage [9], [19].…”

Section: Cracking Formationsupporting

confidence: 71%

“…The different techniques show, in general, similar damage behaviour and the same damage thresholds [8], [11].…”

Section: Discussionmentioning

confidence: 73%

“…Bubbles and three different crack networks with typical cell sizes of 1000, 10 and 0.3 µm were detected after irradiation of the tungsten surface by different methods (after irradiation at the Nd:YAG laser [4], QSPA Kh-50 and GOL-3 [6], [10], PSI-2 [7], Nd:YAG laser, JUDITH-1 and GOL-3 [2], [8] [11]. The typical erosion depth is less than 20 μm [2], [10].…”

Section: Tungsten Surface Modification Depending On Loadmentioning

confidence: 99%

“…Analytical calculations of the stresses are carried out for tungsten [11], [17]. The model only takes into account the basic features of solid body mechanics, without material modifications (e.g.…”

Section: Cracking Formationmentioning

confidence: 99%

See 3 more Smart Citations

Comparison of tungsten modification after irradiation at different facilities for PSI studies

Shoshin¹,

Arakcheev²,

Батаев³

et al. 2016

AIP Conference Proceedings

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Section: Cracking Formationsupporting

confidence: 71%

“…The different techniques show, in general, similar damage behaviour and the same damage thresholds [8], [11].…”

Section: Discussionmentioning

confidence: 73%

Section: Tungsten Surface Modification Depending On Loadmentioning

confidence: 99%

Section: Cracking Formationmentioning

confidence: 99%

See 2 more Smart Citations

Comparison of tungsten modification after irradiation at different facilities for PSI studies

Shoshin¹,

Arakcheev²,

Батаев³

et al. 2016

AIP Conference Proceedings

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“…From the mechanical problem (equation (1b)), the cracking threshold can be estimated. For this purpose, we rely on the theoretical model developed by Arakcheev et al in [50] for the cracking threshold determination under the plane stress approximation for an ideal elasto-plastic material (i.e. no hardening).…”

Section: Laser-induced Thermal Effect Modelingmentioning

confidence: 99%

Nanosecond laser pulses for mimicking thermal effects on nanostructured tungsten-based materials

et al. 2018

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In this work, we exploit nanosecond laser irradiation as a compact solution for investigating the thermomechanical behavior of tungsten materials under extreme thermal loads at the laboratory scale. Heat flux factor thresholds for various thermal effects, such as melting, cracking and recrystallization, are determined under both single and multishot experiments. The use of nanosecond lasers for mimicking thermal effects induced on W by fusionrelevant thermal loads is thus validated by direct comparison of the thresholds obtained in this work and the ones reported in the literature for electron beams and millisecond laser irradiation. Numerical simulations of temperature and thermal stress performed on a 2D thermomechanical code are used to predict the heat flux factor thresholds of the different thermal effects. We also investigate the thermal effect thresholds of various nanostructured W coatings. These coatings are produced by pulsed laser deposition, mimicking W coatings in tokamaks and W redeposited layers. All the coatings show lower damage thresholds with respect to bulk W. In general, thresholds decrease as the porosity degree of the materials increases. We thus propose a model to predict these thresholds for coatings with various morphologies, simply based on their porosity degree, which can be directly estimated by measuring the variation of the coating mass density with respect to that of the bulk.

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Cracking Behavior in Additively Manufactured Pure Tungsten

Wang

et al. 2018

Acta Metall. Sin. (Engl. Lett.)

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In this study, near fully dense (96.5%) pure tungsten bulks were additively manufactured and the cracking behavior was investigated. A crack network with a spacing of * 100 lm was observed in the fabricated bulks. It was observed that the laser scanning strategy, which could tailor the microstructure, affected the crack distribution pattern in fabricated tungsten. The calculated surface temperature difference (7300 K) was much higher than the cracking criterion (800 K) of tungsten, indicating that cracking is almost inevitable in laser additive manufacturing of tungsten. It could be concluded that crack network formed because the cracks emerged in every laser molten track and then interconnected in the layer-by-layer building process.

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Theoretical investigation of crack formation in tungsten after heat loads

Cited by 29 publications

References 6 publications

Comparison of tungsten modification after irradiation at different facilities for PSI studies

Comparison of tungsten modification after irradiation at different facilities for PSI studies

Nanosecond laser pulses for mimicking thermal effects on nanostructured tungsten-based materials

Cracking Behavior in Additively Manufactured Pure Tungsten

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