Distribution of elements during the formation of sintered alloys of the system W-Ni-Fe

Dzykovich, I. Ya.; Makarova, R. V.; Teodorovich, O. K.; Frantsevich, I. N.

doi:10.1007/bf00774652

Cited by 18 publications

(4 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…These alloys are true composites, having a nearly pure tungsten phase dispersed in a nickel-iron-tungsten alloy matrix. Electron microprobe analyses have found that the tungsten phase is typically 99.7% Wand 0.3% Ni +Fe, confirming the work of Dzykovich et al (1965) and Pfeiler (1980). For the purposes of these calculations the tungsten phase is assumed to be 100% W with a density of 19.254 g/cm 3 •…”

Section: Theoretical Densities and Microstructuressupporting

confidence: 79%

Fabrication and properties of tungsten heavy metal alloys containing 30% to 90% tungsten

Gurwell¹,

Nelson²,

Dudder³

et al. 1984

View full text Add to dashboard Cite

In 1983, Pacific Northwest Laboratory conducted a survey of tungsten heavy metal alloys having lower-than-normal (<90%) tungsten content. The purpose of the work was to develop tougher, more impact-resistant high-density alloys for applications benefitting from improved mechanical properties. Tungsten heavy metal alloys of 30% to 90% tungsten content were fabricated, and their mechanical properties were measured. Although ultimate strength was essentially independent of tungsten content, lower tungstencontent alloys had lower yield stress, hardness, and density, and decidedly higher elongations and impact energies. Cold work was effective in raising strength and hardness but detrimental to elongation and impact energies. Precipitation hardening and strain aging raised hardness effectively but had less influence on other mechanical properties • v • CONTENTS

show abstract

Section: Theoretical Densities and Microstructuressupporting

confidence: 79%

Fabrication and properties of tungsten heavy metal alloys containing 30% to 90% tungsten

Gurwell¹,

Nelson²,

Dudder³

et al. 1984

View full text Add to dashboard Cite

show abstract

“…Dzykovich et al [5] have quantitatively analyzed the distribution of individual elements in the tungsten grains and matrix phase in sintered W-Ni-Fe alloys. They observed that addition of Fe decreases the solubility of W in Ni and prevents the formation of an intermetallic phase.…”

Section: Introductionmentioning

confidence: 99%

“…They observed that addition of Fe decreases the solubility of W in Ni and prevents the formation of an intermetallic phase. To avoid this, the matrix composition is restricted to an optimal nickel to iron ratio of 7:3 [5,6]. The sintered properties of WHAs exhibit a complex dependence on particle size, matrix composition, sintering time, temperature and atmosphere, heating/cooling rate, and postsintering heat-treatment.…”

Section: Introductionmentioning

confidence: 99%

Effect of heating mode and sintering temperature on the consolidation of 90W–7Ni–3Fe alloys

Mondal

Upadhyaya

Agrawal

2011

Journal of Alloys and Compounds

View full text Add to dashboard Cite

“…Nickel and iron are commonly added to tungsten to form a ductile solid solution matrix of W-Ni-Fe [5]. The nickel to iron ratio of 7:3 avoids intermetallic precipitation on cooling [6]. Laser sintering (LS) and Laser Melting (LM) enable the fabrication of threedimensional objects from powder materials by selectively heating and fusing particles using a laser beam.…”

Section: Introductionmentioning

confidence: 99%

Densification of W–Ni–Fe powders using laser sintering

Wang

Wraith

Burke

et al. 2016

International Journal of Refractory Metals and Hard Materials

View full text Add to dashboard Cite

In this paper, Laser Sintering (LS) of 90%W-7%Ni-3%Fe (wt.%) powders have been investigated, with the goal to understand the influence of final density by laser power, scanning speed, laser trace width, and the number of scanning passes. The results suggest that the laser power and scanning speed are the most important factors influencing density; the influence of trace width and number of scanning passes are not significant. With the in crease of laser power and decrease of scanning speed, higher density can be achieved. The microstructure anal ysis indicated that the porosity changed from open porosity to closed porosity with higher laser energy input. Energy-Dispersive X-ray Spectroscopy (EDX) analysis shows that during the sintering process, W was not melted but dissolved into the Ni-Fe matrix. Contact flattening and grain accommodation of W grains have been ob served. It suggests that both rearrangement and solution-reprecipitation mechanisms are responsible for the densification. The sintered density with respect to laser power and scanning speed was modeled by continuum modeling theory and compared with experimental results.

show abstract

Distribution of elements during the formation of sintered alloys of the system W-Ni-Fe

Cited by 18 publications

References 0 publications

Fabrication and properties of tungsten heavy metal alloys containing 30% to 90% tungsten

Fabrication and properties of tungsten heavy metal alloys containing 30% to 90% tungsten

Effect of heating mode and sintering temperature on the consolidation of 90W–7Ni–3Fe alloys

Densification of W–Ni–Fe powders using laser sintering

Contact Info

Product

Resources

About