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Volume 2 Issue 2
Apr.  2020
Article Contents

Gu D D, Guo M, Zhang H M, Sun Y X, Wang R et al. Effects of laser scanning strategies on selective laser melting of pure tungsten. Int. J. Extrem. Manuf. 2, 025001 (2020).
Citation: Gu D D, Guo M, Zhang H M, Sun Y X, Wang R et al. Effects of laser scanning strategies on selective laser melting of pure tungsten. Int. J. Extrem. Manuf. 2, 025001 (2020).

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


doi: 10.1088/2631-7990/ab7b00
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  • Publish Date: 2020-04-03
  • 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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Effects of laser scanning strategies on selective laser melting of pure tungsten

doi: 10.1088/2631-7990/ab7b00
  • 1 College of Materials Science and Technology, Nanjing University of Aeronautics and Astronautics, Yudao Street 29, Nanjing 210016, Jiangsu Province, People's Republic of China
  • 2 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

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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