2019
DOI: 10.3390/met9080884
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Densification, Microstructure and Properties of 90W-7Ni-3Fe Fabricated by Selective Laser Melting

Abstract: 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 co… Show more

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Cited by 24 publications
(10 citation statements)
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“…This is mainly because LMD provides larger melt pools than SLM, which helps to homogenize the microstructure and reduce the porosity. The strength of one of the data points for a SLM sample is higher than that of the present LMD sample, which is believed to be related primarily to the small reported powders/W grains of 4-11 µm in this sample [23], rather than a result of the processing route. It has been shown, for example, that if small powders are used even higher strength can be obtained with LMD, while still retaining a uniform elongation of ~5% for a 75W-17.5Ni-7.5Fe alloy [27].…”
Section: Lmd Processingcontrasting
confidence: 62%
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“…This is mainly because LMD provides larger melt pools than SLM, which helps to homogenize the microstructure and reduce the porosity. The strength of one of the data points for a SLM sample is higher than that of the present LMD sample, which is believed to be related primarily to the small reported powders/W grains of 4-11 µm in this sample [23], rather than a result of the processing route. It has been shown, for example, that if small powders are used even higher strength can be obtained with LMD, while still retaining a uniform elongation of ~5% for a 75W-17.5Ni-7.5Fe alloy [27].…”
Section: Lmd Processingcontrasting
confidence: 62%
“…quasi-static tensile tests at strain rates in the order of 10 -4 ~10 -3 s -1 ). Compared to SLM-processed WHAs [16,23], LMD-produced WHAs can result in a better ductility. This is mainly because LMD provides larger melt pools than SLM, which helps to homogenize the microstructure and reduce the porosity.…”
Section: Lmd Processingmentioning
confidence: 99%
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“…Tungsten heavy alloys (WHAs) have many excellent physical and chemical properties, [1][2][3][4][5][6][7][8] such as high strength, high melting point, good wear resistance, low expansion coefficient, and good radiation shielding ability. The 90W-7Ni-3Fe alloy is one typical refractory tungsten alloy, [9,10] which possesses high density, high strength, and a low coefficient of thermal expansion. Because of the ultrahigh melting temperature of tungsten, powder metallurgy was the most useful and promising technology.…”
Section: Introductionmentioning
confidence: 99%