Non-destructive inspection (NDI) of additive manufactured (AM) metal alloys

Ngo, Andrew; Institute of Materials Research and Engineering; Singapore

Ngo, A.; IIMRE A*STAR; Singapore
Ke, K.L.; IIMRE A*STAR; Singapore
Liew, WH; IIMRE A*STAR; Singapore
Liu, H.W.; IIMRE A*STAR; Singapore

ID: ECNDT-0556-2018
Download: PDF
Session: Additive Manufacturing – various methods
Room: H1
Date: 2018-06-12
Time: 11:10 - 11:30

Additive manufactured (AM) metal alloys has enabled the fabrication of lightweight and high complexity components for the aerospace and automotive industry. Similar to traditional processing methods (e.g. casting, welding), porosity is a common concern in AM metal alloys.

X-Ray Computed Tomography (CT) scanning is the “ultimate” tool for porosity measurement in metal alloys. However, the equipment is costly, bulky and the data requires large storage size and long processing time. Therefore, there is a need to develop alternative non-destructive testing (NDT) techniques that are reliable yet less costly and impose lesser demand on post-measurement processing.

In this work, we reported the use of infrared thermography (IRT) and ultrasonic testing (UT) for porosity measurement of AM metal alloys. The samples-under-test are AM metal specimens with different degree of porosity. Consequently, we obtained the correlation between the IRT and UT results with respect to the degree of porosity. We believe that our method will be beneficial to researchers or engineers working on the NDI of AM metal alloys.