NDT in additive manufacturing of metals

0483321 - ÚT 2018 RIV CZ eng C - Conference Paper (international conference)
Převorovský, Zdeněk - Krofta, Josef - Kober, Jan
NDT in additive manufacturing of metals.
NDT in PROGRESS. Praha: Institute of Thermomechanics AS CR, v .v. i., 2017 - (Převorovský, Z.), s. 75-84. ISBN 978-80-87012-63-5.
[International Workshop of NDT Experts /9./. Praha (CZ), 09.10.2017-11.10.2017]
R&D Projects: GA ČR GA17-22615S
Institutional support: RVO:61388998
Keywords : additive manufacturing * 3D printing of metals * nondestructive testing * nonlinear elastic wave spectroscopy
OECD category: Acoustics

In this study we tested possibilities of nonlinear elastic wave spectroscopy (NEWS) methods to classify two types of artificially created defects in Ti-6Al-4V prismatic samples fabricated by Electron Beam Melting (EBM) system. Two series of samples with variable internal defects were tested: samples with central circular defects (missing material gaps), and samples with gradually growing stochastic porosity. Each group of samples contained also fully compact sample for a comparison. Five ultrasonic NEWS procedures were used to classify defects variability. Relatively simple experimental facility with two piezoelectric transducers allows interrogate samples and record their response. The best results, documented in this paper, were obtained by two modifications of NWMS procedure. Results of NEWS tests indicate that selected NEWS procedures can be used also for online AM monitoring.
Permanent Link: http://hdl.handle.net/11104/0279214