Nondestructive Evaluation of Additively Manufactured Metal Components with an Eddy Current Technique

The ability of Additive Manufacturing (AM) processes to ensure delivery of high quality metal-based components is somewhat limited by insufficient inspection capabilities. The inspection of AM parts presents particular challenges due to the design flexibility that the fabrication method affords. The nondestructive evaluation (NDE) methods employed need to be selected based on the material properties, type of possible defects, and geometry of the parts. Electromagnetic method, in particular Eddy Current (EC), is proposed for the inspections. This evaluation of EC inspection considers surface and near-surface defects in a stainless steel (SS) 17 4 PH additively manufactured sample and an SS 17 4 PH annealed plates manufactured traditionally (reference sample). The surfaces of the samples were polished using 1 micron polishing Alumina grit to achieve a mirror-like surface finish. 1.02 mm (0.04”), 0.508 mm (0.02”) and 0.203 mm (0.008”) deep Electronic Discharge Machining (EDM) notches were created on the polished surface of the samples. Lift off and defect responses for both additive and reference samples were obtained using a VMEC-1 commercial instrument and a 500 kHz absolute probe. The inspection results as well as conductivity assessments for the AM sample in terms of the impedance plane signature were compared to response of similar features in the reference sample. Direct measurement of electromagnetic properties of the AM samples is required for precise inspection of the parts. Results show that quantitative comparison of the AM and traditional materials help for the development of EC technology for inspection of additively manufactured metal parts.

DOI: https://doi.org/10.32548/RS.2018.019

References

 

  • L. W. Koester, H. Taheri, T. A. Bigelow, P. C. Collins, and L. J. Bond, “Nondestructive testing for parts fabricated using additive manufacturing,” Mater. Eval., vol. 76, no. 4, 2018.
  • L. W. Koester, L. J. Bond, P. C. Collins, H. Taheri, and T. A. Bigelow, “Non-Destructive Evaluation of Additively Manufactured Metallic Parts,” in Metals Handbook, {New & Rev., ASM International, 2018.
  • L. Koester, H. Taheri, L. J. Bond, D. Barnard, and J. Gray, “Additive manufacturing metrology: State of the art and needs assessment,” in AIP Conf. Proc. 1706, 2016, p. 130001.
  • H. Taheri, “Classification of Nondestructive Inspection Techniques with Principal Component Analysis (PCA) for Aerospace Application,” in ASNT 26th Research Symposium, 2017, pp. 219–227.
  • H. Taheri, M. R. M. Shoaib, L. W. Koester, T. A. Bigelow, P. C. Collins, and L. J. Bond, “Powder based additive manufacturing - A review of types of defects, generation mechanisms, detection, property evaluation and metrology,” Int. J. Addit. Subtractive Mater. Manuf., vol. 1, no. 2, pp. 172–209, 2017.
  • E. I. Todorov, “Measurement of electromagnetic properties of powder and solid metal materials for additive manufacturing,” in Proc. SPIE 10169, Nondestructive Characterization and Monitoring of Advanced Materials, Aerospace, and Civil Infrastructure, 2017, vol. 1016907, no. April, p. 1016907.
  • E. Todorov, P. Boulware, L. Cronley, K. Gaah, and C. Reichert, “Evaluation of Laser Powder Bed Fusion Additive Manufacturing with Array Eddy Current Technology,” in 26th ASNT Research Symposium, 2017, pp. 248–258.
  • M. Mosayebi, S. F. Karimian, and T. P. Chu, “NDT Using Digital Laser Speckle Image Correlation (DiLSIC),” in ASNT 26th Research Symposium, 2017, pp. 185–193.
  • H. Taheri, F. Delfanian, and J. Du, “Wireless NDI for Aircraft Inspection,” in ASNT 22nd Research Symposium, 2013, pp. 120–126.
  • H. Taheri, J. Du, and F. Delfanian, “Development and application of wireless eddy current system for nondestructive testing,” IOSR J. Electron. Commun. Eng., vol. 12, no. 6, pp. 41–50, 2017.
  • M. Lu, H. Xu, W. Zhu, L. Yin, Q. Zhao, A. Peyton, and W. Yin, “Conductivity Lift-off Invariance and measurement of permeability for ferrite metallic plates,” NDT E Int., vol. 95, pp. 36–44, 2018.
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