Effect of processing parameters and strut dimensions on the microstructures and hardness of stainless steel 316L lattice-emulating structures made by powder bed fusion

This work presents the effects of input processing parameters and strut thickness (in square struts) on microstructure and properties in laser powder bed fusion additively manufactured stainless steel 316L lattice-emulating structures. Lattice-emulating X-structures with square cross-sections of 1.5, 1.0, and 0.5 mm were fabricated using three different parameter sets with varying power, speed, and therefore, linear energy density. Grain size and morphology were shown to be dictated by epitaxial growth, which was dependent on weld pool morphology. Additionally, grain size and morphology were shown to change across the thickness direction of the struts (from the bottom inclined surface to the top inclined surface). The spatial variation in grain size was reflected by changes in hardness through the thickness of each strut. The 0.5 mm struts exhibited more significant grain elongation in the strut direction and larger sub-grain solidification cell diameters than their thicker counterparts. The larger sub-grain solidification cell diameters in the 0.5 mm samples resulted in correspondingly lower hardness values when compared to samples of higher thicknesses.

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Work Title Effect of processing parameters and strut dimensions on the microstructures and hardness of stainless steel 316L lattice-emulating structures made by powder bed fusion
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Open Access
Creators
  1. Cole Britt
  2. Colt J. Montgomery
  3. Michael J. Brand
  4. Zi Kui Liu
  5. John S. Carpenter
  6. Allison M. Beese
License In Copyright (Rights Reserved)
Work Type Article
Publisher
  1. Additive Manufacturing
Publication Date April 1, 2021
Publisher Identifier (DOI)
  1. https://doi.org/10.1016/j.addma.2021.101943
Deposited November 15, 2021

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Version 1
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  • Created
  • Added SS316LatticeLPBF_Final.docx
  • Added Creator Cole Britt
  • Added Creator Colt J. Montgomery
  • Added Creator Michael J. Brand
  • Added Creator Zi Kui Liu
  • Added Creator John S. Carpenter
  • Added Creator Allison M. Beese
  • Published
  • Updated
  • Updated