Acoustic monitoring of crack formation in powder bed fusion-laser beam of CM247LC
Artikel i vetenskaplig tidskrift, 2026
Crack formation of CM247LC makes fabrication of this alloy by powder bed fusion-laser beam a major challenge. Rather than focusing on prevention strategies, this work investigates the possibility of monitoring crack formation using in-situ acoustic measurements. During printing, impulsive acoustic events are observed in structure-borne acoustic emission recordings, and a signal processing pipeline is proposed in order to automatically detect these events over the full print. No clear correlation was found between the number of these acoustic events and the observed crack density. However, the acoustic impulses are hypothesized to be caused by post-solidification cracks, where either the hot crack or the sharp edges of lack of fusion porosities act as initiation sites for small scale cracks. This is further validated using operando synchrotron imaging, showing that the formation of a hot crack does not seem to generate acoustic impulses, but the morphology change of the crack after solidification does. Finally, these acoustic events were not detectable with an optical microphone.
Cracking
Acoustic monitoring
PBF-LB
CM247LC
Författare
Rik Vaerenberg
KU Leuven
Jamasp Jhabvala
Ecole Polytechnique Federale de Lausanne (EPFL)
Amir Mohammad Jamili
Ecole Polytechnique Federale de Lausanne (EPFL)
Ahmed Fardan Jabir Hussain
Chalmers, Industri- och materialvetenskap, Material och tillverkning
Laura Perrin
Ecole Polytechnique Federale de Lausanne (EPFL)
Reza Esmaeilzadeh
Ecole Polytechnique Federale de Lausanne (EPFL)
Gowtham Soundarapandiyan
Paul Scherrer Institute
Chalmers, Industri- och materialvetenskap, Material och tillverkning
Vigneashwara Pandiyan
Turun Yliopisto
Eidgenössische Materialprüfungs- und Forschungsanstalt (Empa)
Roland Axel Richter
Eidgenössische Materialprüfungs- und Forschungsanstalt (Empa)
Federica Marone
Paul Scherrer Institut
S. Van Petegem
Paul Scherrer Institut
Eduard Hryha
Chalmers, Industri- och materialvetenskap, Material och tillverkning
Roland E. Logé
Ecole Polytechnique Federale de Lausanne (EPFL)
Bey Vrancken
KU Leuven
Konstantinos C. Gryllias
KU Leuven
Additive Manufacturing Letters
27723690 (eISSN)
Vol. 19 100430Ämneskategorier (SSIF 2025)
Teknisk mekanik
DOI
10.1016/j.addlet.2026.100430