On the Use of EBSD and Microhardness to Study the Microstructure Properties of Tungsten Samples Prepared by Selective Laser Melting

Abbas, Mirza Atif; Yan, Anru; Wang, Wenfei

doi:10.3390/ma14051215

Cited by 5 publications

(3 citation statements)

References 26 publications

(15 reference statements)

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“…The energy density increases, the ultimate tensile strength decreases, whereas, hardness increases slightly with increasing energy density in the limit shown. The result obtained for the relationship between hardness and energy density is similar to the result obtained for tungsten [29], Figure 15.…”

Section: Methodssupporting

confidence: 84%

Optimization of process parameters effects on mechanical properties of selective laser melted iron samples

Hemmati,

Modabberifar,

Taheri

et al. 2023

Materialwissenschaft Werkst

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Selective laser melting is an additive manufacturing technology whereby parts are built through selective melt of a powder bed by a laser beam. This technology is used to produce net shape parts in 3D printers. In this study, the effect of selective laser melting parameters on the mechanical properties (ultimate tensile strength and hardness) of iron has been experimentally extracted, and the optimum levels of the parameters have been determined for optimum mechanical properties using signal‐to‐noise analysis. The selected parameters include the laser power, the laser scanning speed, and the laser hatch distance, and the design of experiments was done by the Taguchi method. The main effects of factors and interactions were considered in this paper. The results show that the optimum parameter levels for the ultimate tensile strength include the laser power of 200 W, the laser scanning speed of 600 mm/s, and the hatch distance of 70 μm. The optimal parameters for hardness are similar to the maximum tensile strength, except that the optimum hatch distance is 60 μm.

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Section: Methodssupporting

confidence: 84%

Optimization of process parameters effects on mechanical properties of selective laser melted iron samples

Hemmati,

Modabberifar,

Taheri

et al. 2023

Materialwissenschaft Werkst

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“…The chemical composition of the powder is given in table 1 below.in the figure 1a, b particle size distribution and surface morphology of tungsten are shown. For the additive manufacturing high density and more granular structures are most suitable [13].…”

Section: Methodsmentioning

confidence: 99%

“…The samples were treated chemically to avoid any errors through open porosity. The contents of oxygen, hydrogen, carbon and nitrogen in molybdenum powder are listed in table 2 and the morphology of powder is displayed in fig 2 .typically both the particles have oxygen saturation of 100-1000 µg/g but it can be increased significantly over the time depending on storage conditions [13].…”

Section: Methodsmentioning

confidence: 99%

Comparative study of additively manufactured samples of tungsten with molybdenum and their applications

Abbas

Yan

Wang

2022

IOP Conf. Ser.: Earth Environ. Sci.

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This article is a comparative study of tungsten (W) and molybdenum (Mo) samples manufactured by selective laser melting (SLM).Under the processing parameters different microstructural and mechanical properties like strain energy density, micro-hardness and surface morphology were investigated. Before the preparation of samples the SEM and XRD images were taken to calculate the size of micro particles of both the samples. These samples were further investigated by OM(optical microscopy),SEM(scanning electron microscope),EBSD(electron backscattering diffraction) and Vicker hardness to study the crystallographic structure, hardness, grain boundaries to understand a brief comparison between these two fourth group elements. It was identified as the cause of a very prominent structure with cracked features and a residual remains. During processing, different processing factors were examined, which separates at the edges of the grain, thereby creating thermal cracks. This due to the low eutectic melting compared to the matrix phase. These factors also result in a higher Ductile-to-Brittle Transition (DBTT). Later, during rapid cooling from the melting point, a combination of cracks with hot cracks on the borders of solid grain grains and cold cracks near weak grain edges forms a cracked network, which is often found in tungsten and molybdenum refined SLM. Neither does a very hot substrate plate prevent the formation of cracks in the metals formed by processing parameters. These materials are appropriate for high temperature up to more than 20000C such an analytic and inner wall constituents of fusion reactor or experiments. Parameters like laser power, scan speed, hatching space and the thickness of the powder layer are analyzed to achieve the high density samples. Three-dimensional printing is changing the way we make things in almost every industry, from cars to medical equipment to biotech.3D printing to prototype one of the most critical enabling technology in a building, the heat exchanger. In comparison to current designs, this next-generation heat exchanger weighs 20% less, performs 20% better, and can be produced much faster.

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Preparation of spherical tungsten powder with uniform distribution of lanthania by plasma spheroidization

Wang,

Hao,

Wang

et al. 2023

International Journal of Refractory Metals and Hard Materials

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On the Use of EBSD and Microhardness to Study the Microstructure Properties of Tungsten Samples Prepared by Selective Laser Melting

Cited by 5 publications

References 26 publications

Optimization of process parameters effects on mechanical properties of selective laser melted iron samples

Optimization of process parameters effects on mechanical properties of selective laser melted iron samples

Comparative study of additively manufactured samples of tungsten with molybdenum and their applications

Preparation of spherical tungsten powder with uniform distribution of lanthania by plasma spheroidization

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