Additive manufacturing of pure tungsten by means of selective laser beam melting with substrate preheating temperatures up to 1000 ∘C

Müller, A. von; Schlick, Georg; Neu, R.; Anstätt, C.; Klimkait, T.; Lee, J.; Pascher, B.; Schmitt, Matthias; Seidel, Christian

doi:10.1016/j.nme.2019.02.034

Cited by 141 publications

(73 citation statements)

References 12 publications

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“…Similarly, Tan et al [16] also obtained SLM tungsten with a relative density of 98.5% and analyzed the effects of different laser powers and scan speeds on the SLM's surface morphology, microstructure, and properties. All the previous studies on SLM tungsten indicated that the crack phenomenon was inevitable due to the inherent brittle nature of tungsten [17][18][19]. Therefore, several measures of crack-suppression for SLM pure tungsten were adopted and reported by Li et al [20] and Iveković et al [21].…”

Section: Introductionmentioning

confidence: 99%

Densification, Microstructure and Properties of 90W-7Ni-3Fe Fabricated by Selective Laser Melting

Wei

Zhou

et al. 2019

Metals

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The preparation of refractory tungsten and tungsten alloys has always been challenging due to their inherent properties. Selective laser melting (SLM) offers a choice for preparing tungsten and tungsten alloys. In this work, 90W-7Ni-3Fe samples were prepared by selective laser melting and investigated. Different process parameter combinations were designed according to the Taguchi method, and volumetric energy density (VED) was defined. Subsequently, the effects of process parameters on densification, phase composition, microstructure, tensile properties, and microhardness were investigated. Nearly a full densification sample (≥99%) was obtained under optimized process parameters, and the value of VED was no less than 300 J/mm3. Laser power had a dominant influence on densification behavior compared with other parameters. The main phases of 90W-7Ni-3Fe are W and γ-(Ni-Fe), dissolved with partial W. In addition, 90W-7Ni-3Fe showed a high tensile strength (UTS = 1121 MPa) with poor elongation (<1%). A high average microhardness (>400 HV0.3) was obtained, but the microhardness presented a fluctuation along building direction due to the inhomogeneous microstructure.

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Section: Introductionmentioning

confidence: 99%

Densification, Microstructure and Properties of 90W-7Ni-3Fe Fabricated by Selective Laser Melting

Wei

Zhou

et al. 2019

Metals

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“…[126,127] In ref. [128], it was found that all fiber samples categorized as brittle exhibit an increased C content compared with the fibers categorized as ductile.…”

Section: W Compositesmentioning

confidence: 97%

“…Even though the fusion materials program at Forschungszentrum Jülich GmbH covers a wide range of topics, new materials for fusion are being considered worldwide and also include new copper materials and copper composites, [60,61] tungsten heavy alloy and ductile phase toughened tungsten [62][63][64] as well as advanced manufacturing methods for even more advanced material concepts. [65,66]…”

Section: Materials For Fusionmentioning

confidence: 99%

Fusion Materials Development at Forschungszentrum Jülich

Coenen

2020

Adv Eng Mater

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Material issues pose a significant challenge for the design of future fusion reactors. From a historic point of view, the material mix used for the first wall of a fusion reactor has continually evolved, from original steel vessels to carbon and other low-Z materials such as beryllium to tungsten as the primary candidate for a reactor's first wall armor and divertor material. For materials considered for fusion applications, a highly integrated approach is necessary. Resilience against neutron damage, good power exhaust, and oxidation resistance during accidental air ingress are design relevant issues while deciding on new materials or improving upon baseline materials. Neutron-induced effects, e.g., transmutation adding to embrittlement, retention, and changes to thermomechanical properties, are crucial to material performance. In this contribution, the recent progress (2013-2019) in fusion materials development for current and future fusion devices, at Forschungszentrum Jülich GmbH, with activities focussing on advanced materials and their characterization is given. It is a continuation and extension of the work given by Coenen et al.

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“…Tungsten (W) is the most potential candidate for plasma‐facing components in future fusion reactors, due to its highest melting point of metals and high resistance against erosion. [ 1 ] However, its application was restricted by its inherent brittleness and relatively high brittle‐to‐ductile transition temperature. [ 2,3 ] In particular, fibrous tungsten or tungsten fibers (W f ), which are mass produced and commercially available for hundreds of years especially for the application as filaments by rolling, swaging, and wire drawing techniques, [ 4 ] exhibit both high tensile strength and large ductility due to the van Gogh patterned microstructure with strong <110> texture.…”

Section: Introductionmentioning

confidence: 99%

Insight into the Microstructure and Tensile Behavior of the W–Cu Composite Reinforced with Tungsten Fibers and Particulates

et al. 2020

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Herein, the microstructure and tensile property of the tungsten fiber (Wf)‐reinforced W–Cu composite are investigated by both experimental and simulation methods. An electron backscattering diffraction (EBSD) analysis reveals the elongated <110> textured grains in the Wf compared with the matrix part, ensuring the small quantities of the grain boundaries along the direction perpendicular to the tensile direction. Tensile tests further confirm its improved strength by ≈8.0% (526.8 ± 5.3 MPa) compared with the composite without inserted Wf, with a satisfactory tensile strain of 5.9 ± 0.3%. Based on the fractography observation and finite‐element analysis, typically stable energy dissipation behavior of the composite is considered to be ascribed to the interactive competition between complex fracture modes, including frictional fiber pullout, elastic bridging, interface debonding, and crack deflection.

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Additive manufacturing of pure tungsten by means of selective laser beam melting with substrate preheating temperatures up to 1000 ∘C

Cited by 141 publications

References 12 publications

Densification, Microstructure and Properties of 90W-7Ni-3Fe Fabricated by Selective Laser Melting

Densification, Microstructure and Properties of 90W-7Ni-3Fe Fabricated by Selective Laser Melting

Fusion Materials Development at Forschungszentrum Jülich

Insight into the Microstructure and Tensile Behavior of the W–Cu Composite Reinforced with Tungsten Fibers and Particulates

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