4.6 Article

Selective laser melting of Ti-22Al-25Nb intermetallic: Significant effects of hatch distance on microstructural features and mechanical properties

Journal

Publisher

ELSEVIER SCIENCE SA
DOI: 10.1016/j.jmatprotec.2019.116398

Keywords

Selective laser melting; Ti-22Al-25Nb; Hatch distance; Microstructure; Mechanical property; Intermetallics

Funding

  1. Natural Science Foundation of Guangdong Province [2016A030313756]
  2. Science, Technology and Innovation Commission of Shenzhen Municipality [JCYJ20170817111811303, JCYJ20170817110358927, JCYJ20170817110331228, ZDSYS201703031748354]
  3. Humboldt Research Fellowship for Experienced Researchers
  4. Pico Center at SUSTech
  5. Presidential fund of Shenzhen Municipality
  6. Development and Reform Commission of Shenzhen Municipality

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Ti-22Al-25Nb (at.%) intermetallic is a light weight, high performance, high temperature material with density of merely (similar to)60% of Ni-based superalloys. The advent and rapid development of selective laser melting (SLM) enable direct fabrication of the Ti-22Al-25Nb intermetallic into complex geometry parts, promising for various critical applications. This paper is dedicated to better understanding the effects of hatch distance, an important but often underestimated processing factor, on microstructure and mechanical properties of the SLM-prepared Ti-22Al-25Nb. Along with analytical means such as transmission electron microscopy (TEM) and electron backscatter diffraction (EBSD), finite element simulation has also been employed to explore the underlying mechanisms. It is determined that the highest mechanical properties are achieved at a hatch distance of 0.16 mm due to the following factors: (a) High density dislocation, (2) favorable phase features, and (3) high relative density. As-fabricated parts of micro-turbine engine using the optimized parameters are provided in the end of the study to demonstrate the capability of SLM to manufacture high quality and delicate structural parts of the Ti-22Al-25Nb intermetallic.

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