Texture evolution and basic thermal–mechanical properties of pure tungsten under various rolling reductions

Zhang, Xiaoxin; Yan, Qingzhi; Lang, Shaoting; Xia, Min; Chen, Ge

doi:10.1016/j.jnucmat.2015.04.001

Cited by 43 publications

(8 citation statements)

References 17 publications

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“…In this study, surprisingly the As-Dep samples are characterised by a slightly lower density, but a higher thermal conductivity when compared to the Heat-Treat samples. Furthermore, the thermal conductivity of tungsten deposited by WAAM was found to be higher than that of other manufacturing methods [33,34,41,42], which can be explained by the higher purity, the higher density, and the lower number of grains boundaries seen in the structures presented in this research.…”

Section: Thermal Conductivitymentioning

confidence: 59%

“…Both thermal diffusivity and conductivity greatly depend on the density, a higher density yielding a higher thermal conductivity. In fact, it has been already reported that thermal conductivity can be influenced by volume defects [39,40]; it has also been reported that a high number of dislocation and/or grain boundaries can decrease the thermal conductivity [41]. This is because these features increase the interfacial area.…”

Section: Thermal Conductivitymentioning

confidence: 98%

See 1 more Smart Citation

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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Section: Thermal Conductivitymentioning

confidence: 59%

Section: Thermal Conductivitymentioning

confidence: 98%

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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“…Based on the review of the available open literature data, one can single out three providers of tungsten products that have been fabricated according to the ITER specification, with dimensions suitable for the application in ITER. These providers include: (i) Plansee (Austria), see, e.g., [3,[10][11][12][13][14][15][16][17]; (ii) Advanced Technology and Materials AT&M (China), see, e.g., [18][19][20][21][22][23][24][25], and A.L.M.T. (Japan), see, e.g., [13,[26][27][28][29][30][31].…”

Section: Introductionmentioning

confidence: 99%

Neutron irradiation effects on mechanical properties of ITER specification tungsten

et al. 2021

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In this contribution, we present the results of recent neutron irradiation campaign performed in the material test reactor BR2 (Belgium) on pure tungsten. We have applied various irradiation conditions and sample geometry to assess the effect of neutron irradiation on hardness, bending, tensile and fracture mechanical properties. The investigated material is a commercially pure tungsten plate fabricated according to the international thermonuclear experimental reactor (ITER) specification for the application in the divertor plasma-facing components. The neutron irradiation covers a large span of temperatures and damage doses, ranging from 600 to 1200 °C and 0.1-1 dpa. The obtained mechanical properties were analyzed to deduce the shift of the ductile to brittle transition temperature (DBTT) applying bending, tensile and fracture toughness-testing procedures. Then, a correlation of the fracture toughness with the change of the hardness was established. The obtained results are compared with the already published results on another ITER specification grade produced in the form of a rod. The presented and discussed results show that the performance of the compared grades in terms of the irradiation-induced embrittlement is similar, and that the irradiation in the high-temperature region (600-800 °C) causes a considerable DBTT shift already at 0.2-0.5 dpa.

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“…For example, an "as rolled" tungsten sheet can have a DBTT between 100 and 200 °C, while fine wires or foil were even reported to be ductile at room temperature [10]. The impact of the degree o the deformation was studied by Zhang et al [38] who investigated the thermal and me chanical properties of a 30-mm-thick tungsten sample under different rolling reductions The DBTT for the 90% and 60% rolled samples were estimated to be 527 °C and 577 °C respectively. This change in temperature was significantly smaller than that expected fo such extreme differences in deformation.…”

Section: Methods For Improving the Ductility Of Tungstenmentioning

confidence: 99%

Advanced Processing and Machining of Tungsten and Its Alloys

Omole

Lunt

Kirk

et al. 2022

JMMP

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Tungsten is a refractory metal with the highest melting temperature and density of all metals in this group. These properties, together with the high thermal conductivity and strength, make tungsten the ideal material for high-temperature structural use in fusion energy and other applications. It is widely agreed that the manufacture of components with complex geometries is crucial for scaling and optimizing power plant designs. However, there are challenges associated with the large-scale processing and manufacturing of parts made from tungsten and its alloys which limit the production of these complex geometries. These challenges stem from the high ductile-to-brittle transition temperature (DBTT), as well as the strength and hardness of these parts. Processing methods, such as powder metallurgy and additive manufacturing, can generate near-net-shaped components. However, subtractive post-processing techniques are required to complement these methods. This paper provides an in-depth exploration and discussion of different processing and manufacturing methods for tungsten and identifies the challenges and gaps associated with each approach. It includes conventional and unconventional machining processes, as well as research on improving the ductility of tungsten using various methods, such as alloying, thermomechanical treatment, and grain structure refinement.

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Texture evolution and basic thermal–mechanical properties of pure tungsten under various rolling reductions

Cited by 43 publications

References 17 publications

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

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

Neutron irradiation effects on mechanical properties of ITER specification tungsten

Advanced Processing and Machining of Tungsten and Its Alloys

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