pp 1–10 | Cite as

ICME Approach to Determining Critical Pore Size of IN718 Produced by Selective Laser Melting

  • Michael D. SangidEmail author
  • Priya Ravi
  • Veerappan Prithivirajan
  • Nolan A. Miller
  • Peter Kenesei
  • Jun-Sang Park
ICME-Based Design and Optimization of Materials for Additive Manufacturing


A degree of porosity is expected in additively manufactured (AM) materials. To aid in the qualification of AM materials, the smallest pore size that results in a debit in the fatigue performance is quantified. In the work presented herein, crystal plasticity simulations are used to identify the stress concentration around pores of various sizes, revealing that a single 20-μm pore or two 10-μm pores (with centers spaced 15 μm apart) localize stress at the pore, as opposed to elsewhere in the microstructure. In situ microtomography and far-field high-energy x-ray diffraction microscopy were used to identify crack formation and the evolution of the grain-level micromechanical fields during cyclic loading. Eighteen cracks were observed (15 at pores, 3 at the surface) at highly stressed grains in a sample, although most did not propagate. The dominant crack was seen to originate from the free surface, which is rationalized by fracture mechanics.



Support for this work was provided by DARPA under Contract N66001-14-1-4041 with program managers M. Maher and J. Vanderbrande. The IN718 specimens were manufactured by R. Martukanitz and K. Meinert at Penn State University’s Center for Innovative Materials Processing through Direct Digital Deposition (CIMP-3D). The authors would like to thank Dr. D. Naragani for assistance with data collection during the in situ experiments and helpful discussions regarding data reconstruction, A. Mallory for fractography analysis, Dr. T. Book for preliminary material characterization, J. Rotella for assistance during the in situ experiments, and Dr. H. Sharma of the Argonne National Laboratory for help with ff-HEDM data reconstruction. Use of the Advanced Photon Source was supported by the US Department of Energy, Office of Science, Office of Basic Energy Sciences, under Contract No. DE-AC02-06CH11357.


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Copyright information

© The Minerals, Metals & Materials Society 2019

Authors and Affiliations

  1. 1.School of Aeronautics and AstronauticsPurdue UniversityWest LafayetteUSA
  2. 2.School of Materials EngineeringPurdue UniversityWest LafayetteUSA
  3. 3.X-ray Science DivisionArgonne National LaboratoryLemontUSA

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