Spatially resolved acoustic spectroscopy for texture imaging in powder bed fusion nickel superalloys

Dryburgh, Paul; Patel, Rikesh; Pieris, Don M.; Hirsch, Matthias; Li, Wenqi; Sharples, Steve D.; Smith, Richard J.; Clare, Adam T.; Clark, Matt

Abstract

© 2019 Author(s). There is a clear industrial pull to fabricate high value components using premium high temperature aerospace materials by additive manufacturing. Inconveniently, the same material properties which allow them to perform well in service render them difficult to process via powder bed fusion. Current build systems are charac-terised by high defect rates and erratic microstructure, leading to components with inferior mechanical properties. The work presents microstructural texture imaging of powder-bed fusion components by a non-contact laser ultrasonic method, Spatially Resolved Acoustic Spectroscopy (SRAS). In short, this work demonstrates the ability to SRAS to detect and characterise meso-scale crystalline texture features. Probing samples manufactured by powder bed fusion, in the common nickel based aerospace superalloy Inconel 718, it has been shown the the primary crystalline orientation of can be inferred from the measured velocity, with good agreement with Electron Backscatter Diffraction. The studied sample was found to have a microstructure formation that bore a heavy resemblance to the chosen scanning pattern, with clear influence from the geometry through varying scan vector length and island-boundary scan strategy. This work forms part of a progression towards deployment of a SRAS system as an in-situ inspection solution for PBF.

Citation

Dryburgh, P., Patel, R., Pieris, D. M., Hirsch, M., Li, W., Sharples, S. D., …Clark, M. (2019). Spatially resolved acoustic spectroscopy for texture imaging in powder bed fusion nickel superalloys. AIP Conference Proceedings, 2102, Article 020004. https://doi.org/10.1063/1.5099708

• Journal Article Type: Conference Paper
• Conference Name: 45th Annual Review of Progress in Quantitative Nondestructive Evaluation
• Conference Location: Vermont, USA
• Start Date: May 8, 2019
• Acceptance Date: Apr 8, 2019
• Online Publication Date: May 8, 2019
• Publication Date: May 8, 2019
• Deposit Date: May 21, 2019
• Publicly Available Date: May 9, 2020
• Journal: AIP Conference Proceedings
• Print ISSN: 0094-243X
• Electronic ISSN: 1551-7616
• Publisher: American Institute of Physics
• Peer Reviewed: Peer Reviewed
• Volume: 2102
• Article Number: 020004
• DOI: https://doi.org/10.1063/1.5099708
• Public URL: https://nottingham-repository.worktribe.com/output/2076056
• Publisher URL: https://aip.scitation.org/doi/abs/10.1063/1.5099708
• Additional Information: This article may be downloaded for personal use only. Any other use requires prior permission of the author and AIP Publishing. This article appeared in Spatially resolved acoustic spectroscopy for texture imaging in powder bed fusion nickel superalloys, Paul Dryburgh*, Rikesh Patel, Don M. Pieris, Matthias Hirsch, Wenqi Li, Steve D. Sharples, Richard J. Smith, Adam T. Clare, and Matt Clark, AIP Conference Proceedings 2102, 020004 (2019 and may be found at https://aip.scitation.org/doi/abs/10.1063/1.5099708.