Effect of microstructural anisotropy on the mechanical properties of K-doped tungsten rods for plasma facing components

Nogami, Shuhei; Guan, Wenhai; Fukuda, Makoto; Hasegawa, Akira

doi:10.1016/j.fusengdes.2015.11.024

Cited by 20 publications

(17 citation statements)

References 12 publications

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“…Tungsten (W) is one of the most attractive materials [1][2][3][4]. However, tungsten is known as a material which properties are strongly influenced by its fabrication techniques [5] and anisotropy of its microstructure [6], as well as a grain size of the structure surface [7]. Nogami et al proved that Charpy impact properties of W depend on the above-mentioned material attributes [5].…”

Section: Introductionmentioning

confidence: 99%

Adaptation of Fracture Mechanics Methods for Quality Assessment of Tungsten Carbide Cutting Inserts

et al. 2021

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Tungsten carbide (WC) is well known as one of the hardest materials widely used in machining, cutting and drilling, especially for cutting tools production. Knowing fracture toughness grants the opportunity to prevent catastrophic wear of a tool. Moreover, fracture toughness of WC-based materials may vary because of different material compositions, as well as a different way of production. Hence, each material should be treated individually. In this paper, SM25T (HW) tungsten carbide (HW—uncoated grade, TNMR 401060 SM25T, manufactured by Baildonit company, Katowice, Poland) was taken into consideration. Sintered carbides—designated as S—are designed to be applied for machining steel, cast steel and malleable cast iron. Fracture mechanics methods were adapted to make a quality assessment of WC cutting inserts. Both quasi-statical three-point bending tests, as well as Charpy dynamic impact tests, were performed to calculate static and dynamic fracture toughness (KIC and KID, respectively). In addition, a special emphasis was placed on the microscopic analysis of fracture surfaces after impact tests to discuss material irregularities, such as porosity, cracks and so-called “river patterns”. There is a lack of scientific works in this field of study. However, cutting engineers are interested in obtaining the experimental results of that kind. Although there are a few standardized methods that may be used to determine fracture toughness of hard metals, none of them is expected to be the most reliable. Moreover, there is a lack of scientific works in the field of determining static and dynamic fracture toughness of WC by the presented method. The proposed examination solution can be then successfully used to calculate toughness properties of WC-based materials, as the results obtained seem to be with a good agreement with other works.

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Section: Introductionmentioning

confidence: 99%

Adaptation of Fracture Mechanics Methods for Quality Assessment of Tungsten Carbide Cutting Inserts

et al. 2021

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“…It was demonstrated that K-doping not only led to improving tensile strength but also hardly changed the elongation, regardless of the test direction and temperature [24,28]. The ductility of W at low temperatures was enhanced via the K-doping, especially in the direction along the radial [28]. In W rods with large diameters, K-doping could retard the influence of microstructural anisotropy, especially the ductility during tensile tests.…”

Section: Mechanical Properties Of Wkmentioning

confidence: 99%

“…and alloys (W-Re, etc.). Pertinent reviews of W-based materials for fusion applications are well organized [2,4,8,9,13,15,22,28,36,[41][42][43][44][45][46][47][48][49][50]. However, WK as a rapidly developed PFM has not been specially summarized yet.…”

Section: Pfms and Wkmentioning

confidence: 99%

“…A 3.2 × 10 −3 wt%-K-content rod (a diameter of 20 mm) was also made through powder metallurgy (PM) and swaging by A.L.M.T. Corp [28]. In Europe, WVWM (a K-doped W material by vacuum metallizing) bulks whose diameter was 15 mm and the deformation degree was 1.7 [31] were fabricated by PLANSEE AG.…”

Section: Preparation Of Wkmentioning

confidence: 99%

“…The accompanied stress concentration makes a significant reduction in toughness. Tungsten-potassium or potassium-doped tungsten (WK), which brings in nano-sized K bubbles to pin GBs and dislocations, and simultaneously enhances the toughness and strength, is of great importance in PFMs [12,13,16,[27][28][29][30][31][32][33][34][35]. The main mechanical properties and preparation of WK are reviewed in this paper.…”

Section: Introductionmentioning

confidence: 99%

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Tungsten–potassium: a promising plasma-facing material

2019

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Tungsten-potassium (potassium-doped tungsten or WK), initially known from the electric filament industry, is a promising plasma-facing material (PFM) in future fusion facilities like International Thermonuclear Experimental Reactor (ITER). However, the brittle nature of W and irradiation-induced defects of WK materials may result in a risk of deuterium-tritium reaction failure in fusion reactors. Previous studies revealed that advanced W with ultrafine grains and nanostructures might be able to address these problems. However, K-doped W, a rapidly developed material for PFMs, lacks a systematical summary. In this review, we firstly describe the powder metallurgy and plastic deformation for the preparation of WK. Then, the mechanical properties of WK and thermal shock resistance results are reviewed. Important issues such as irradiation damages from neutron, heavy ion, and plasma (H isotope or He) irradiation are also discussed. Hitherto, WK under irradiations shows comparable or even better performances compared with other counterparts such as ITER grade pure tungsten. This review could be benefitial to the future efforts of improving the ductility and irradiation tolerance of WK materials.

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Compatibility investigation of liquid tin and tungsten-based capillary porous system under high-density plasma environment

et al. 2020

Tungsten

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Effect of microstructural anisotropy on the mechanical properties of K-doped tungsten rods for plasma facing components

Cited by 20 publications

References 12 publications

Adaptation of Fracture Mechanics Methods for Quality Assessment of Tungsten Carbide Cutting Inserts

Adaptation of Fracture Mechanics Methods for Quality Assessment of Tungsten Carbide Cutting Inserts

Tungsten–potassium: a promising plasma-facing material

Compatibility investigation of liquid tin and tungsten-based capillary porous system under high-density plasma environment

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