Temperature and deformation effect on the low and high angle grain boundary structure of a double forged pure tungsten

Sheng, Hua; Sun, Zhi; Uytdenhouwen, I.; Oost, G. Van; Zhang, Fei

doi:10.1016/j.ijrmhm.2015.01.008

Cited by 26 publications

(4 citation statements)

References 14 publications

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“…Recrystallized grains have lower GOS values than deformed grains as reported in several papers [31][32][33][34][35] . In this work, a threshold value of 2.5 o was chosen to distinguish recrystallized and non-recrystallized grains.…”

Section: Annealing Behaviorsupporting

confidence: 71%

Microstructural Stability of a Niobium Single Crystal Deformed by Equal Channel Angular Pressing

et al. 2017

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A [211]-oriented niobium single crystal was deformed by equal channel angular pressing (ECAP) at room temperature using the route B c to a total strain of 9.2. A sharp cube texture develops after ECAP processing. The deformed samples were annealed in vacuum from 400ºC (673 K) to 900ºC (1173 K) for 1 h to evaluate their microstructural stability. Scanning electron microscopy (SEM) was used to image the microstructures of as-deformed and annealed specimens. Electron backscatter diffraction (EBSD) was employed to determine the respective microtextures before and after annealing. Coarsening of the microstructure occurs at a maximum rate at 550ºC (823 K) due to discontinuous recrystallization. Normal grain growth replaces discontinuous recrystallization as the main coarsening mechanism above 700ºC (973 K).

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Section: Annealing Behaviorsupporting

confidence: 71%

Microstructural Stability of a Niobium Single Crystal Deformed by Equal Channel Angular Pressing

et al. 2017

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“…Indeed, heat flux tests have concluded that the maximum operating temperature of the helium-cooled divertor should be 800 K for the blanket firstwall; around 1000 K -1200 K for the lowest armour; and above 2000 K for the armour surface [2], making tungsten an ideal candidate material. Finally, tungsten is characterised by a high resistance to sputtering or erosion, and low tritium retention [9,10].…”

Section: Introductionmentioning

confidence: 99%

Microstructure and thermal properties of unalloyed tungsten deposited by Wire + Arc Additive Manufacture

Marinelli

Martina

Lewtas

et al. 2019

Journal of Nuclear Materials

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Tungsten is considered as one of the most promising materials for nuclear fusion reactor chamber applications. Wire + Arc Additive Manufacturing has already demonstrated the ability to deposit defect-free large-scale tungsten structures, with considerable deposition rates. In this study, the microstructure of the asdeposited and heat-treated material has been characterised; it featured mainly large elongated grains for both conditions. The heat treatment at 1273 K for 6 hours had a negligible effect on microstructure and on thermal diffusivity. Furthermore, the linear coefficient of thermal expansion was in the range of 4.5x10 -6 µm m -1 K -1 to 6.8x10 -6 µm m -1 K -1 ; the density of the deposit was as high as 99.4% of the theoretical tungsten density; the thermal diffusivity and the thermal conductivity were measured and calculated, respectively, and seen to decrease considerably in the temperature range between 300 K to 1300 K, for both testing conditions. These results showed that Wire + Arc Additive Manufacturing can be considered as a suitable technology for the production of tungsten components for the nuclear sector.

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“…It results in EM effects that the shape of liquid metal and finally the solidified surface can be effectively influenced. Figure shows that this effect is possibly used for controlling the surface quality of solidified metals which can be critical for their mechanical properties …”

Section: Electromagnetic Field Effectsmentioning

confidence: 99%

Electromagnetic Field Assisted Metallic Materials Processing: A Review

Zhao¹,

Chai²,

Zheng³

et al. 2016

steel research int.

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Electromagnetic fields have been widely applied in the field of materials processing, preparation, and analysis. The effectiveness during such processing is, however, highly dependent on the physics of the applied electromagnetic field as well as the electromagnetic responses from the materials. In order to improve the efficiency of electromagnetic field processing, understanding the fundamentals as well as the engineering of the corresponding electromagnetic effects is crucial. Focusing on metallic materials, this research gives a critical overview and discussion on different electromagnetic effects. Subsequently, the electromagnetic responses in different electromagnetic technologies are further discussed. Specifically, the industrial application potential for inclusion removal from liquid metals is evaluated and the energy coefficient is noticed to be substantially improved by increasing the magnetic flux density.

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Temperature and deformation effect on the low and high angle grain boundary structure of a double forged pure tungsten

Cited by 26 publications

References 14 publications

Microstructural Stability of a Niobium Single Crystal Deformed by Equal Channel Angular Pressing

Microstructural Stability of a Niobium Single Crystal Deformed by Equal Channel Angular Pressing

Microstructure and thermal properties of unalloyed tungsten deposited by Wire + Arc Additive Manufacture

Electromagnetic Field Assisted Metallic Materials Processing: A Review

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