Techniques for high-fidelity X-ray micro-tomography of additively manufactured metal components

ABSTRACT

Additive manufacturing is revolutionising the production of complex-shaped components and finding widespread application in the industries where production volumes are low and part geometries are complex. High-fidelity 3D imaging of additively manufactured metal parts, as the most effective nondestructive evaluation method, is crucial to maintaining the quality of safety-critical components during manufacturing. However, 3D X-ray imaging of large metallic parts is complicated by strong, nonlinear interactions between the sample and the X-ray beam; phenomena such as beam hardening, photon starvation and X-ray scatter are difficult to account for and cause artefacts in the computed 3D tomographic volume. These artefacts can obscure real defects and cause severe inaccuracies in analysis and evaluation. Here we present several techniques developed in the CTLab at the Australian National University that enhance the micro-tomography instruments’ ability to image large, complex metallic components.

KEYWORDS:

• Scanning trajectories
• X-ray beam-hardening
• X-ray metal artefacts
• X-ray scatter

Acknowledgements

The authors acknowledge the financial support of the Australian Research Council Linkage Project LP150101040, the Australian Research Council Industrial Transformation Training Centre IC180100008 and supercomputer access from Australia’s National Computational Infrastructure (NCI). M.G. Grewar is supported by an Australian Government Research Training Program (RTP) Scholarship.

Disclosure statement

No potential conflict of interest was reported by the author(s).

Additional information

Funding

This work was supported by the Australian Research Council LP150101040, IC18010008 and a Research Training Program Scholarship for M.G. Grewar.