Formation of Nanocrystalline Tungsten by Selective Laser Melting of Tungsten Powder

Zhang, Danqing; Cai, Qizhou; Liu, Jinhui

doi:10.1080/10426914.2012.663119

Cited by 68 publications

(27 citation statements)

References 9 publications

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“…Selective laser melting (SLM), as an additive manufacturing technology, is mainly used to fabricate small scale and high-precision components [1][2][3][4]. However, in recent years, large-scale manufacturing has gradually become an important trend of SLM.…”

Section: Introductionmentioning

confidence: 99%

Residual Stress, Defects and Grain Morphology of Ti-6Al-4V Alloy Produced by Ultrasonic Impact Treatment Assisted Selective Laser Melting

et al. 2016

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For large-scale selective laser melting (SLM) additive manufacturing technology, three main problems severely restrict its development and application, namely the residual stress, defects, and columnar grains with anisotropy. To overcome these problems, a new method is proposed by combining SLM with ultrasonic impact treatment (UIT) technique. This study explores the feasibility of UIT assisted SLM, as well as the effect of UIT on the residual stress, defects and β grains of Ti-6Al-4V alloy sample. The results indicate that after the application of UIT during SLM, residual stress can be largely reduced and defects can be hammered flat and even eliminated. Meanwhile, the epitaxial growth of columnar grains is prevented, and fine equiaxed grains are formed due to plastic deformation and recrystallization.

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Section: Introductionmentioning

confidence: 99%

Residual Stress, Defects and Grain Morphology of Ti-6Al-4V Alloy Produced by Ultrasonic Impact Treatment Assisted Selective Laser Melting

et al. 2016

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“…The density of the SLD tungsten deposit, measured using Archimedes was 18.3 g/cm 3 which falls within the specification range of 18.3-18.7 g/cm 3 for what would be required if the technique was to be used for a X-ray target refurbishment operation [9]. This density result is ~95% of the density of wrought tungsten (19.3 g/cm 3 ).…”

Section: Coating Structurementioning

confidence: 90%

“…Deposition of tungsten via the consolidation of micron scale powder has been reported using selective laser melting (SLM) and Cold Spray (CS) [3,4]. Although deposition has been achieved with SLM, work reported details deposits which are either alloyed to allow full density to be achieved [5], or porous with densities not exceeding 82% [3].…”

Section: Introductionmentioning

confidence: 99%

“…Although deposition has been achieved with SLM, work reported details deposits which are either alloyed to allow full density to be achieved [5], or porous with densities not exceeding 82% [3].…”

Section: Introductionmentioning

confidence: 99%

“…The melting temperature of 3410 0 C is the highest of all metals. The density of tungsten is normally 19.3 g/cm 3 at 20 0 C. The room temperature tensile has a range of 600 -3450 MPa [1]. Its applications include filaments for light bulbs, emitters and targets for X-ray tubes.…”

Section: Introductionmentioning

confidence: 99%

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Supersonic Laser Deposition of Tungsten

Jones

Cockburn

Sparkes

et al. 2014

Volume 1: Materials; Micro and Nano Technologies; Properties, Applications and Systems; Sustainable Manufacturing

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Near fully dense tungsten coatings onto molybdenum substrates have been demonstrated using the Supersonic Laser Deposition (SLD) process. This is a characteristic that is not readily achievable with refractory materials. The tensile strength of the tungsten deposited coatings is similar to that of wrought tungsten, with no evidence of melting or substrate grain growth. The tungsten coating to a molybdenum substrate shows no evidence of melting or substrate grain growth. The SLD process is a novel deposition method that is based upon Cold Spay (CS) principles. In this technique the deposition velocities can be significantly lower than those required for effective bonding in CS processing. The addition of laser heating alters the mechanical properties of the materials at the deposition site. The results have shown that SLD is able to deposit tungsten with unique interface bonding and desirable properties as opposed to other deposition processes for refractory materials.

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Microstructure and Processing of 3D Printed Tungsten Microlattices and Infiltrated W–Cu Composites

et al. 2018

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Tungsten is of industrial relevance due its outstanding intrinsic properties (e.g., highest melting‐point of all elements) and therefore difficult to 3D‐print by conventional methods. Here, tungsten micro‐lattices are produced by room‐temperature extrusion‐based 3D‐printing of an ink comprising WO3–0.5%NiO submicron powders, followed by H2‐reduction and Ni‐activated sintering. The green bodies underwent isotropic linear shrinkage of ≈50% during the thermal treatment resulting in micro‐lattices, with overall 35–60% open‐porosity, consisting of 95–100% dense W–0.5%Ni struts having ≈80–300 μm diameter. Ball‐milling the powders and inks reduced the sintering temperature needed to achieve full densification from 1400 to 1200 °C and enabled the ink to be extruded through finer nozzles (200 μm). Partial sintering of the struts is achieved when NiO is omitted from the ink, with submicron interconnected‐porosity of ≈34%. Several tungsten micro‐lattices are infiltrated with molten copper at 1300 °C under vacuum, resulting in dense, anisotropic W–Cu composites with 40–65% tungsten volume fraction. Partially sintered struts (containing nickel) with submicron open porosity are also infiltrated with Cu, resulting in co‐continuous W–Cu composites with wide W struts/Cu channels at the lattice scale (hundreds of micrometers), and fine W–Cu interpenetrating network at the strut scale (hundreds of nanometers) allowing for the design of anisotropic mechanical and electrical properties.

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Formation of Nanocrystalline Tungsten by Selective Laser Melting of Tungsten Powder

Cited by 68 publications

References 9 publications

Residual Stress, Defects and Grain Morphology of Ti-6Al-4V Alloy Produced by Ultrasonic Impact Treatment Assisted Selective Laser Melting

Residual Stress, Defects and Grain Morphology of Ti-6Al-4V Alloy Produced by Ultrasonic Impact Treatment Assisted Selective Laser Melting

Supersonic Laser Deposition of Tungsten

Microstructure and Processing of 3D Printed Tungsten Microlattices and Infiltrated W–Cu Composites

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