Abstract
Selective electron beam melting (SEBM) is an additive manufacturing process for the production of complex metallic parts. To optimize their mechanical properties, pores and fusion defects, since not completely avoidable, have to be detected and evaluated. The generated microstructure may contain not only voids, but also weak bonds, sharp interfaces and loose particles causing nonlinear elasticity. This paper reports on Nonlinear Impact Modulation Spectroscopy (NIMS) experiments applied to a set of Ti–6Al–4V samples, each of which contains an internal zone with well-defined porosity ranging from 0.2 to 20%, respectively. Resonance spectra, attenuation and indicators of material nonlinearity were evaluated, which allowed the localization, dimensioning and assessment of porous zones. Properties of used linear and nonlinear methods are discussed.
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Acknowledgements
Alena Kruisova, Milan Chlada, Jan Kober and Zdenek Prevorovsky were funded by the Grant Agency of the Czech Republic (GA19-14237S) and institutional support RVO: 61388998. The work of Sigrun Hirsekorn was supported by the European Regional Development Fund under Grant No.CZ.02.1.01/0.0/0.0/15_003/0000493 (Centre of Excellence for Nonlinear Dynamic Behaviour of Advanced Materials in Engineering).
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Kober, J., Kirchner, A., Kruisova, A. et al. Assessing Porosity in Selective Electron Beam Melting Manufactured Ti–6Al–4V by Nonlinear Impact Modulation Spectroscopy. J Nondestruct Eval 39, 86 (2020). https://doi.org/10.1007/s10921-020-00731-z
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DOI: https://doi.org/10.1007/s10921-020-00731-z