Effect of processing parameters on the densification, microstructure and crystallographic texture during the laser powder bed fusion of pure tungsten

Sidambe, Alfred T.; Tian, Yingtao; Prangnell, P.B.; Fox, Peter

doi:10.1016/j.ijrmhm.2018.10.004

Cited by 89 publications

(43 citation statements)

References 36 publications

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“…The GBs between columnar grains are high angle grain boundaries with significant orientation difference . In the plastic deformation, the deformation of grains is not arbitrary, and such high angle grain boundaries need to coordinate the deformation between adjacent grains, so they often become the crack sources under stress.…”

Section: Resultsmentioning

confidence: 99%

“…All these factors hinder the increase in density of SLM‐processed tungsten. As Sidambe et al . reported, the residual defects of pure tungsten parts manufactured using the current scanning strategy may not be eliminated.…”

Section: Introductionmentioning

confidence: 96%

“…fabricated pure tungsten samples with a relative density of 98.5% using SLM. Recent literature also revealed that nearly full‐dense tungsten could be prepared by SLM. In view of the characteristics of SLM, however, the manufacture of high melting point tungsten still faces some technical challenges.…”

Section: Introductionmentioning

confidence: 99%

“…In conventional processing, heat treatments after cold deformation are often used to create recrystallization and alter the grain structure. Sidambe et al . stated that the heat treatments of tungsten after SLM processing were not available owing to the lack of high dislocation density, and any heat treatments would only result in slow growth of grain.…”

Section: Introductionmentioning

confidence: 99%

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Selective Laser Melting and Remelting of Pure Tungsten

et al. 2020

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The processing of pure tungsten encounters a substantial challenge due to its high melting point and intrinsic brittleness. Selective laser melting (SLM) technique is gaining popularity and offers an excellent processing approach for refractory metals. Herein, dense pure tungsten specimens are produced by optimizing SLM processing parameters. The mechanical property of the SLM‐produced tungsten with an ultimate compressive strength of about 1200 MPa, which is obviously superior to that reported in other literature, is achieved. The increased laser energy input is instrumental in raising density and surface roughness of tungsten specimens. Interestingly, additional remelting of processed layers during SLM improves the surface quality and the microstructure and achieves the highest relative density (98.4% ± 0.5%). After laser remelting, the surface roughness is reduced by 28% and a large number of fine grains are obtained. The flow of fluids caused by remelting plays a decisive role in the formation of fine grains and the defect level. Therefore, these findings offer a new insight into SLM of pure tungsten.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 96%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Selective Laser Melting and Remelting of Pure Tungsten

et al. 2020

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“…Apart from the W coating manufacturing technologies, melting technologies [98][99][100][101][102][103][104][105] of arc melting, electron beam melting (EBM) and additive manufacturing approach of selective laser melting (SLM) are also applied to produce W materials. Due to the high melting point, conventional melting and casting techniques are unsuitable for the production of ingots of the refractory metals.…”

Section: Coating and Additive Manufacturing Techniquesmentioning

confidence: 99%

Manufacturing of tungsten and tungsten composites for fusion application via different routes

2019

Tungsten

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Tungsten is a refractory metal with the highest melting point of all metals, which is considered as a promising candidate material for plasma-facing materials in the future fusion reactor. However, tungsten faces several challenges from intrinsic embrittlement, irradiation embrittlement and recrystallization embrittlement during the operation of the fusion reactor. To satisfy the fusion engineering application, an advanced tungsten material with the fine grain and dense microstructure is required and developed. This paper briefly introduces the application background of the tungsten materials and mainly illustrates a series of common techniques for manufacturing advance tungsten materials, such as powder preparation technologies, bulk densification techniques, continuous processing technologies and the coating and additive manufacturing technologies. Furthermore, the development prospects for manufacturing techniques of tungsten materials are also presented in the end. Considering the tungsten materials employed in the fusion engineering application, combining these scalable techniques of the wet-chemical method, pressureless sintering and continuous deformation processing techniques would be the possible research and development routes to realize the manufacture of the advanced tungsten materials.

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Controlled Crystallographic Texture Orientation in Structural Materials Using the Laser Powder Bed Fusion Process—A Review

Cobbinah,

Matsunaga,

Yamabe-Mitarai

2023

Adv Eng Mater

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Advantages of the laser powder bed fusion (LPBF) process over conventional processing methods include microstructural control capability and complex geometry parts fabrication. For most alloys, the microstructure‐property relationship typically guides the LPBF process toward achieving application‐specific properties. Nonetheless, the LPBF process produces a high degree of anisotropy, primarily from the epitaxial preferred grain growth mechanisms during solidification and the consequent highly textured microstructures produced. The crystallographic texture‐controlled build concept through the LPBF process is a material design and processing approach gaining a lot of interest because of the promising unique and superior properties offered by the anisotropy accompanying the LPBF process. The numerous attempts at intentional texture‐controlled building or parts fabrication from structural materials using the LPBF process warrant an up‐to‐date review. Thus, this review presents solidification mechanisms that influence texture evolution during the LPBF process such as the melting mode, melt pool shape, influence of thermal gradient, and solidification rate. Furthermore, this review delves into the influence of LPBF process parameters on texture, accompanying microstructural evolution, and the intentional control of texture effects on properties such as mechanical, corrosion, and oxidation resistance.This article is protected by copyright. All rights reserved.

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Effect of processing parameters on the densification, microstructure and crystallographic texture during the laser powder bed fusion of pure tungsten

Cited by 89 publications

References 36 publications

Selective Laser Melting and Remelting of Pure Tungsten

Selective Laser Melting and Remelting of Pure Tungsten

Manufacturing of tungsten and tungsten composites for fusion application via different routes

Controlled Crystallographic Texture Orientation in Structural Materials Using the Laser Powder Bed Fusion Process—A Review

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