Densification of W–Ni–Fe powders using laser sintering

Wang, Xuan; Wraith, Matthew; Burke, Stephen; Rathbun, Howard; DeVlugt, Kyle

doi:10.1016/j.ijrmhm.2016.01.006

Densification of W–Ni–Fe powders using laser sintering

Journal Article · Fri Jan 15 00:00:00 EST 2016 · International Journal of Refractory and Hard Metals

DOI:https://doi.org/10.1016/j.ijrmhm.2016.01.006· OSTI ID:1809184

Wang, Xuan ^[1]; Wraith, Matthew ^[2]; Burke, Stephen ^[2]; Rathbun, Howard ^[2]; DeVlugt, Kyle ^[1]

California Polytechnic State Univ. (CalPoly), San Luis Obispo, CA (United States)
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)

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 increase of laser power and decrease of scanning speed, higher density can be achieved. Additionally, the microstructure analysis 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 observed. 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.

View Accepted Manuscript (DOE)

Research Organization:: Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)

Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA)

Grant/Contract Number:: AC52-07NA27344

OSTI ID:: 1809184

Report Number(s):: LLNL-JRNL--735135; 884692

Journal Information:: International Journal of Refractory and Hard Metals, Journal Name: International Journal of Refractory and Hard Metals Vol. 56; ISSN 0263-4368

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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42 ENGINEERING
additive manufacturing
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laser sintering
microstructure
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Densification of W–Ni–Fe powders using laser sintering

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