Detection and effects of lack of fusion defects in Hastelloy X manufactured by laser powder bed fusion

Palm MS, Diepold B, Neumeier S, Höppel HW, Göken M, Zaeh MF (2023)

Publication Type: Journal article

Publication year: 2023

Journal

Book Volume: 230

Article Number: 111941

DOI: 10.1016/j.matdes.2023.111941

Abstract

Laser Powder Bed Fusion (L-PBF) is increasingly used for the manufacturing of complex metal parts. A major hurdle for L-PBF to manufacture critical parts is the lack of knowledge about the effects of inner material defects on the material properties. This paper presents a new method to manufacture specimens with inner lack of fusion (LOF) defects and to detect and localize them simultaneously by the in-process monitoring tool Optical Tomography (OT). The presence of defects at locations indicated by OT was verified through Computed Tomography analyses. Correlative metallographic preparation of the processed specimens showed LOF defects with their main extent within the build plane and sharp edges. Moreover, microstructural investigations revealed a fine globular grain structure and coarse dendritic segregations in the area, influenced by the defect. Correlations between the LOF defects analyzed in the microstructure and corresponding OT indications were established. Tensile tests and high cycle fatigue tests were performed on defective and non-defective material to evaluate the effects of LOF defects on the material properties of Hastelloy® X manufactured by L-PBF. While a minor influence of the LOF defects on static material properties was identified, the fatigue life of the defective specimens was significantly reduced.

Authors with CRIS profile

Additional Organisation(s)

Involved external institutions

Technische Universität München (TUM) Germany (DE)

How to cite

APA:

Palm, M.S., Diepold, B., Neumeier, S., Höppel, H.W., Göken, M., & Zaeh, M.F. (2023). Detection and effects of lack of fusion defects in Hastelloy X manufactured by laser powder bed fusion. Materials & Design, 230. https://doi.org/10.1016/j.matdes.2023.111941

MLA:

Palm, M. S., et al. "Detection and effects of lack of fusion defects in Hastelloy X manufactured by laser powder bed fusion." Materials & Design 230 (2023).

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