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Defect, Microstructure, and Mechanical Property of Ti-6Al-4V Alloy Fabricated by High-Power Selective Laser Melting

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Abstract

To improve the selective laser melting (SLM) productivity, a high laser power and accordingly adjusted parameters are employed to facilitate a high build rate. Three distinct processing strategies with incremental build rate are developed for SLM Ti-6Al-4V. Various types of defects are investigated. Further studies were carried out by heat-treatment and hot isostatic pressing to evaluate the influence of microstructure and porosity on mechanical properties. The anisotropic mechanical property in horizontally and vertically build samples were observed, which was attributable to the columnar grains and spatial arrangement of defects. Regardless of anisotropy, a post-SLM heat-treatment at 800°C for 2 h produces a combined high strength and ductility.

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Acknowledgements

This research is funded by the Monash Centre for Additive Manufacturing (MCAM) and Australia Research Council IH130100008 “Industrial Transformation Research Hub for Transforming Australia’s Manufacturing Industry through High Value Additive Manufacturing.” The authors appreciate the help provided by Bryce Melville and John Shurvinton. They also acknowledge both the Australian Postgraduate Awards (APA) and International Postgraduate Research Scholarship (IPRS) for S.C.’s PhD sponsorship. Finally support from the Monash Centre of Electron Microscopy is acknowledged.

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Author notes

  1. Sheng Cao and Zhuoer Chen contributed equally to this work.

Authors and Affiliations

  1. Monash Centre for Additive Manufacturing, Notting Hill, VIC, 3168, Australia

    Sheng Cao, Zhuoer Chen, Chao Voon Samuel Lim, Kun Yang, Qingbo Jia, Tom Jarvis & Xinhua Wu

  2. Department of Mechanical and Aerospace Engineering, Monash University, Clayton, VIC, 3800, Australia

    Zhuoer Chen

  3. Department of Materials Science and Engineering, Monash University, Clayton, VIC, 3800, Australia

    Sheng Cao, Kun Yang, Qingbo Jia, Tom Jarvis & Xinhua Wu

  4. Amaero Engineering, Notting Hill, VIC, 3168, Australia

    Dacian Tomus

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  1. Sheng Cao
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Correspondence to Sheng Cao.

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Cao, S., Chen, Z., Lim, C.V.S. et al. Defect, Microstructure, and Mechanical Property of Ti-6Al-4V Alloy Fabricated by High-Power Selective Laser Melting. JOM 69, 2684–2692 (2017). https://doi.org/10.1007/s11837-017-2581-6

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  • DOI: https://doi.org/10.1007/s11837-017-2581-6

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