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Paper | Open Access

Effects of laser scanning strategies on selective laser melting of pure tungsten

Dongdong Gu1,2 Meng Guo1,2Hongmei Zhang1,2Yixuan Sun1,2Rui Wang1,2Lei Zhang1,2
College of Materials Science and Technology, Nanjing University of Aeronautics and Astronautics, Yudao Street 29, Nanjing 210016, Jiangsu Province, People’s Republic of China
Jiangsu Provincial Engineering Laboratory for Laser Additive Manufacturing of High-Performance Metallic Components, Nanjing University of Aeronautics and Astronautics, Yudao Street 29, Nanjing 210016, Jiangsu Province, People’s Republic of China
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Abstract

Three types of scanning strategies, including the chessboard scanning strategy, the zigzag scanning strategy and the remelting scanning strategy, were conducted to study the effects of scanning strategies on surface morphology, microstructure, mechanical properties and the grain orientation of selective laser melted pure tungsten. The results showed that the pores and cracks were main defects in SLM-processed tungsten parts. The pores could be eliminated using the remelting scanning strategy. However, the cracks seemed to be inevitable regardless of the applied scanning strategies. The microstructures of SLM-processed tungsten were columnar grains and showed strong epitaxial growth along the building direction. A compressive strength of 923 MPa with an elongation of 7.7% was obtained when the zigzag scanning strategy was applied, which was the highest among the three scanning strategies. By changing the scanning strategies, the texture of SLM-processed tungsten in the direction of processing could be changed.

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International Journal of Extreme Manufacturing
Pages 025001-025001
Cite this article:
Gu D, Guo M, Zhang H, et al. Effects of laser scanning strategies on selective laser melting of pure tungsten. International Journal of Extreme Manufacturing, 2020, 2(2): 025001. https://doi.org/10.1088/2631-7990/ab7b00

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Received: 19 December 2019
Revised: 07 February 2020
Accepted: 28 February 2020
Published: 23 March 2020
© 2020 The Author(s).

Original content from this work may be used under the terms of the Creative Commons Attribution 3.0 licence. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI.

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