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Stress and deformation evaluation of the subarea scanning effect in direct laser-deposited Ti-6Al-4V

  • Hui Yan
  • Lida Shen
  • Xiao Wang
  • Zongjun Tian
  • Guojian Xu
  • Deqiao Xie
  • Huixin Liang
ORIGINAL ARTICLE
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Abstract

The present work investigated the influence of the subarea scanning pattern on substrate deformation and residual stress distribution in direct laser-deposited Ti-6Al-4V. An island scanning pattern, adopted as a representative subarea scanning pattern, was compared with the successive scanning pattern experimentally. Additionally, different island scanning strategies with islands of different sizes (60 × 60, 40 × 40, and 20 × 20 mm2) and different island scanning orders (specified, outside in and inside out) were investigated in large-scale deposition. The results showed that the island scanning pattern reduces the deformation due to successive scanning pattern by 71% and causes a periodically oscillated residual stress distribution on the whole deposit. The island scanning order has a more basic effect than the island size on deformation and residual stress. The newly defined outside-in island scanning order remarkably minimizes deformation, while the randomly specified order induces the smallest residual stress; thus, their combination is appropriate for the fabrication of the large components. Moreover, buckling deformation unexpectedly occurs even if a 5-mm-thick substrate is used primarily due to the small temperature gradient generated by the small island size of 20 × 20 mm2.

Keywords

Direct laser deposition Ti-6Al-4V Subarea scanning pattern Residual stress Deformation 

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Notes

Funding information

The work was financially supported by the Science and Technology Support Program of Jiangsu (NO. BE2014009-1, BE2014009-2), Key Research and Development Program of Jiangsu (BE2015161), and National Key Research and Development Program of China (No. 2016YFB1100500).

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Copyright information

© Springer-Verlag London Ltd., part of Springer Nature 2018

Authors and Affiliations

  • Hui Yan
    • 1
  • Lida Shen
    • 1
  • Xiao Wang
    • 1
  • Zongjun Tian
    • 1
  • Guojian Xu
    • 2
  • Deqiao Xie
    • 1
  • Huixin Liang
    • 1
  1. 1.College of Mechanical and Electrical EngineeringNanjing University of Aeronautics and AstronauticsNanjingChina
  2. 2.Nanjing Zhongke Raycham Laser Technology Co., ltdNanjingChina

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