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Densification, Microstructure and Properties of 90W-7Ni-3Fe Fabricated by Selective Laser Melting

1
State Key Laboratory for Manufacturing System Engineering, School of Mechanical Engineering, Xi’an Jiaotong University, Xi’an 710049, China
2
School of Mechanical Engineering, Dongguan University of Technology, Dongguan 523808, China
*
Author to whom correspondence should be addressed.
Metals 2019, 9(8), 884; https://doi.org/10.3390/met9080884
Received: 23 July 2019 / Revised: 7 August 2019 / Accepted: 7 August 2019 / Published: 13 August 2019
(This article belongs to the Special Issue Additive Manufacturing of Metals)
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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 composition, microstructure, tensile properties, and microhardness were investigated. Nearly a full densification sample (≥99%) was obtained under optimized process parameters, and the value of VED was no less than 300 J/mm3. Laser power had a dominant influence on densification behavior compared with other parameters. The main phases of 90W-7Ni-3Fe are W and γ-(Ni-Fe), dissolved with partial W. In addition, 90W-7Ni-3Fe showed a high tensile strength (UTS = 1121 MPa) with poor elongation (<1%). A high average microhardness (>400 HV0.3) was obtained, but the microhardness presented a fluctuation along building direction due to the inhomogeneous microstructure. View Full-Text
Keywords: selective laser melting; 90W-7Ni-3Fe; densification; microstructure; properties selective laser melting; 90W-7Ni-3Fe; densification; microstructure; properties
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Li, J.; Wei, Z.; Zhou, B.; Wu, Y.; Chen, S.-G.; Sun, Z. Densification, Microstructure and Properties of 90W-7Ni-3Fe Fabricated by Selective Laser Melting. Metals 2019, 9, 884.

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