Detecting porosity of 3D printed ti6al4v by nonlinear elastic wave spectroscopy

0519739 - ÚT 2020 RIV CZ eng A - Abstract
Kober, Jan - Kirchner, A. - Kruisová, Alena - Chlada, Milan - Weisgärber, T.
Detecting porosity of 3D printed ti6al4v by nonlinear elastic wave spectroscopy.
NDT in Progress 2019. Praha: Ústav termomechaniky AV ČR, v. v. i., 2019 - (Převorovský, Z.). s. 119. ISBN 978-80-87012-72-7.
[NDT in Progress 2019 /10./. 07.10.2019-10.10.2019, Praha]
R&D Projects: GA TA ČR(CZ) TK01030108
Institutional support: RVO:61388998
Keywords : nonlinear elasticity * additive manufacturing * selective electron beam melting * nonlinear wave modulation spectroscopy * nonlinear resonant ultrasound spectroscopy
OECD category: Materials engineering

Selective Electron Beam Melting (SEBM) is a powder bed technology for the production of metallic parts. In order to achieve nominal mechanical properties, microstructural defects have to be
detected and avoided. The porous microstructure can contain voids, weak bonds, sharp interfaces and loose particles, all of which was linked with the occurrence of nonlinear elastic wave
propagation. A set of Ti-6Al-4V samples with defined internal volume with porosity ranging from 0.2 % to 20 % is experimentally investigated. An Impact Modulation Spectroscopy experiment was
performed on the sample set and experimental results were analysed for linear and nonlinear indicators of material porosity. Porosity was indicated by means of Resonant Ultrasound
Spectroscopy and its nonlinear counterpart, by a measure of attenuation and by nonlinear modulation.
Permanent Link: http://hdl.handle.net/11104/0304943