Thermal tomography 3D imaging of additively manufactured metallic structures

Heifetz, A.; Shribak, D.; Zhang, X.; Saniie, J.; Fisher, Z. L.; Liu, T.; Sun, J. G.; Elmer, T.; Bakhtiari, S.; Cleary, W.

doi:10.1063/5.0016222

Thermal tomography 3D imaging of additively manufactured metallic structures

Journal Article · Mon Oct 12 00:00:00 EDT 2020 · AIP Advances

DOI:https://doi.org/10.1063/5.0016222· OSTI ID:1774561

^[1]; ^[1]; Zhang, X. ^[2]; ^[3]; Fisher, Z. L. ^[4]; ^[5]; ^[1]; ^[1]; ^[1]; Cleary, W. ^[6]

Argonne National Lab. (ANL), Argonne, IL (United States)
Argonne National Lab. (ANL), Argonne, IL (United States); Illinois Institute of Technology, Chicago, IL (United States)
Illinois Institute of Technology, Chicago, IL (United States)
Argonne National Lab. (ANL), Argonne, IL (United States); Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
Argonne National Lab. (ANL), Argonne, IL (United States); Univ. of California, Berkeley, CA (United States)
Westinghouse Electric Company, Hopkins, SC (United States)

Thermal tomography is a computational method for heat diffusion-based imaging of solids, which provides 3D visualization of data from flash thermography measurements. We investigate thermal tomography imaging and nondestructive evaluation of stainless steel and nickel super alloy metallic structures produced with the laser powder bed fusion (LPBF) additive manufacturing (AM) process. Metallic structures produced with LPBF contain defects, and there are limited capabilities to evaluate these structures non-destructively. Thermal tomography reconstruction of 3D apparent spatial effusivity provides information about AM structure geometry and internal material flaws. We study performance of thermal tomography in imaging of metallic structures through COMSOL computer simulations of transient heat transfer and through reconstruction of data obtained from experimental measurements. Thermal tomography reconstructions of structure shape and dimensions are shown for the Inconel 718 AM structure which has variations in the horizontal plane but is uniform along the depth dimension. Reconstruction of internal defects is investigated using a stainless steel 316L specimen with flat bottom hole (FBH) indentations, and the Inconel 718 plate is produced with the LPBF method, which contains imprinted hemispherical shape low density regions containing non-sintered metallic powder. The FBHs have the same sizes as the imprinted defects in the LPBF specimens but offer better imaging contrast. Thermal tomography reconstructions provide visualizations of internal defects and allow for estimation of their sizes and locations. Results of this study demonstrate that thermal tomography can be used for visualization and quality control in AM.

View Accepted Manuscript (DOE)

Research Organization:: Argonne National Laboratory (ANL), Argonne, IL (United States)

Sponsoring Organization:: USDOE; USDOE Office of Nuclear Energy (NE), Nuclear Energy Enabling Technologies (NEET)

Grant/Contract Number:: AC02-06CH11357

OSTI ID:: 1774561

Alternate ID(s):: OSTI ID: 1671852

Journal Information:: AIP Advances, Journal Name: AIP Advances Journal Issue: 10 Vol. 10; ISSN 2158-3226

Publisher:: American Institute of Physics (AIP)Copyright Statement

Country of Publication:: United States

Language:: English

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