Investigation of the selective laser melting process with molybdenum powder

Faidel, D.; Jonas, D.; Natour, Ghaleb; Behr, W.

doi:10.1016/j.addma.2015.09.002

Cited by 50 publications

(29 citation statements)

References 6 publications

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“…As a near net-shape forming technology, additive manufacturing (AM) is widely used in the fabrication of traditional difficult-to-cut metals, such as titanium, molybdenum, magnesium alloys, etc. [10][11][12][13][14]. It is a promising method based on the principle of layer by layer accumulation with a heat source moving in a specific path [14].…”

Section: Introductionmentioning

confidence: 99%

Characterization of Microstructure and Mechanical Properties of Stellite 6 Part Fabricated by Wire Arc Additive Manufacturing

Cui

Wang³

et al. 2019

Metals

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Stellite 6 alloy has excellent wear resistance, corrosion resistance, and oxidation resistance, however the difficulties in traditional processing limit its wide application. Additive manufacturing technology that has emerged in recent years is expected to provide a new way for the processing of stellite 6 alloy. In this study, two square thin-walled stellite 6 parts were fabricated through the wire arc additive manufacturing technology. At the same time, the effect of stress relief annealing on the mechanical performance of the fabricated stellite 6 part was studied and compared with the corresponding casting part. The results indicate that the additive manufacturing stellite 6 components exhibit satisfactory quality and appearance. Moreover, the microstructure of the additive manufacturing part is much finer than that of the casting part. From the substrate to the top region of the additive manufacturing part, the morphology of the dendrites changes from columnar to equiaxed, and the hardness increases firstly and then decreases gradually. In addition, the average hardness of the additive manufacturing part is ~7–8 HRC higher than the casting part. The ultimate tensile strength and yield strength is ~150MPa higher than the casting part, while the elongation is almost the same. The stress relief annealing has no significant effect on the hardness of the AM part, but it can slightly improve the strength.

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Section: Introductionmentioning

confidence: 99%

Characterization of Microstructure and Mechanical Properties of Stellite 6 Part Fabricated by Wire Arc Additive Manufacturing

Cui

Wang³

et al. 2019

Metals

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“…For the plasma spheroidized powder, the volume was determined by Eq. [8]. Using the molar volume of tungsten, taken to be 9.55 9 10 À6 m 3 mol À1 , [30] the numbers of moles, n, for the two powders were determined using Eqs.…”

Section: ½4mentioning

confidence: 99%

“…[5] Early attempts at LPBF of tungsten-based materials investigated additions of these sintering aids which acted as a binder phase, lowering the melting point and increasing processability so that densities of around 80 pct with little cracking were achieved processing at 100 W. [6,7] The high activation of Cu and Ni makes this strategy unsuitable for fusion applications. Attempts at processing both pure tungsten and molybdenum yielded low densities (< 85 pct) due to the low laser powers (< 200 W) used [8,9] resulting in incomplete consolidation. More recent work, conducted with 300-to 500-W systems have shown improved results with densification up to 96 pct of theoretical density (TD), but suggested that cracking may be present.…”

Section: Introductionmentioning

confidence: 99%

The Effect of Powder Characteristics on Build Quality of High-Purity Tungsten Produced via Laser Powder Bed Fusion (LPBF)

Field

Carter

Adkins

et al. 2020

Metall Mater Trans A

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Two high-purity tungsten powders, produced via different manufacturing techniques, were characterized to determine size distribution, morphology, thermal properties, and flow characteristics and, thus, the likely suitability for Laser Powder Bed Fusion (LPBF) production. Specimens from duplicate builds were produced with the two powders and characterized for density, defect mechanisms, and thermal penetration into the substrate plate to compare apparent power densities. The first powder was a chemically reduced powder with irregular morphology and the second, a plasma spheroidized powder with highly spherical morphology. The latter was found to have tighter morphological control and size distribution, having a third of particles at the modal particle size in comparison to a fifth of the chemically reduced powder. This led to better flow characteristics, and an increase of 1.5 g cm À3 (1500 kg m À3) in the packing densities seen in the powder bed which corresponds to 57 pct theoretical density vs 50 pct theoretical density in the chemically reduced powder. As a result, the specimens produced from the plasma spheroidized powder had higher densities (97.3 vs 88.5 pct) and the dominant defect mechanism moved from lack of fusion dominated in the chemically reduced powder to cracking dominated in the plasma spheroidized. The plasma spheroidized powder also showed higher apparent power densities (effective absorptivities) as evidenced by an 80 pct deeper penetration of the laser into the substrate plate.

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“…Another important advantage of the SLM process is the ability to produce elements made of materials with high melting points, e.g., tantalum [9], molybdenum [10], rhenium [11] and tungsten carbide [12], and to combine metallic powders of those materials with metals of significantly different physical properties. As the attempts of modifying mechanical properties of Ti and its alloys in the SLM process by additions of refractory metals such as Mo [13] and Re [14] appeared successful, this work considers further investigations of selective laser melted Ti-Re alloys.…”

Section: Introductionmentioning

confidence: 99%

Hot Corrosion of Ti–Re Alloys Fabricated by Selective Laser Melting

et al. 2017

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Selective laser melting (SLM) is an additive manufacturing process that enables novel alloy production by combining metals with significantly different physical properties. In this paper, the hot corrosion behavior of Ti-Re alloys fabricated by SLM was studied in a mixture of Na 2 SO 4 and NaCl salts at 600°C. The morphology and composition of the corrosion products were characterized by scanning electron microscopy with energy-dispersive X-ray spectroscopy and X-ray diffraction to understand the degradation mechanisms. It has been shown that the hot corrosion resistance of Ti-Re alloys was influenced by the chemical inhomogeneity of the oxide scale resulting from the presence of rhenium particles undissolved during the SLM process.

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Investigation of the selective laser melting process with molybdenum powder

Cited by 50 publications

References 6 publications

Characterization of Microstructure and Mechanical Properties of Stellite 6 Part Fabricated by Wire Arc Additive Manufacturing

Characterization of Microstructure and Mechanical Properties of Stellite 6 Part Fabricated by Wire Arc Additive Manufacturing

The Effect of Powder Characteristics on Build Quality of High-Purity Tungsten Produced via Laser Powder Bed Fusion (LPBF)

Hot Corrosion of Ti–Re Alloys Fabricated by Selective Laser Melting

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