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Open AccessArticle

Beam Diameter Dependence of Performance in Thick-Layer and High-Power Selective Laser Melting of Ti-6Al-4V

1
School of Materials Science and Mechanical Engineering, Beijing Technology and Business University, Beijing 100048, China
2
School of Naval Architecture and Mechanical-electrical Engineering, Zhejiang Ocean University, Zhoushan 316022, China
3
Beijing Xinghang Mechanical and Electrical Equipment Co. Ltd., Beijing 100074, China
*
Author to whom correspondence should be addressed.
Materials 2018, 11(7), 1237; https://doi.org/10.3390/ma11071237
Received: 22 June 2018 / Revised: 10 July 2018 / Accepted: 11 July 2018 / Published: 18 July 2018
A 400 W high-power laser was used to fabricate 200-µm-thick Ti-6Al-4V samples to evaluate the effects of small (50 μm) and large (200 μm) beam diameter on density, microstructure and mechanical properties. A series of single-track experiments demonstrated that it was challenging for the small-beam laser to fabricate smooth and defect-free scan tracks. A larger beam diameter efficiently avoided process instability and provided a more stable and uniform melt pool. By increasing the beam diameter, the density of multilayer samples reached 99.95% of the theoretical value, which is much higher than that achieved with the small beam diameter. However, it was difficult to completely eliminate defects due to serious spatter and evaporation. Moreover, all of the generated samples had relatively coarse surfaces. For the large beam diameter of 200 µm, the optimal yield strength, ultimate tensile strength and elongation were 1150 MPa, 1200 MPa and 8.02%, respectively. In comparison, the small beam diameter of 50 µm resulted in values of 1035 MPa, 1100 MPa and 5.91%, respectively. Overall, the large-diameter laser is more suitable for high-power selective laser melting (SLM) technology, especially for thick layers. View Full-Text
Keywords: selective laser melting; high layer thickness; high power; beam diameter; Ti6Al4V selective laser melting; high layer thickness; high power; beam diameter; Ti6Al4V
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MDPI and ACS Style

Shi, W.; Liu, Y.; Shi, X.; Hou, Y.; Wang, P.; Song, G. Beam Diameter Dependence of Performance in Thick-Layer and High-Power Selective Laser Melting of Ti-6Al-4V. Materials 2018, 11, 1237.

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