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On the interplay of microstructure and residual stress in LPBF IN718

Itziar Serrano-Munoz, Tobias Fritsch, Tatiana Mishurova, Anton Trofimov, Daniel Apel, Alexander Ulbricht, Arne Kromm, René Hesse, Alexander Evans and Giovanni Bruno

Article (2021)

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Abstract

The relationship between residual stresses and microstructure associated with a laser powder bed fusion (LPBF) IN718 alloy has been investigated on specimens produced with three different scanning strategies (unidirectional Y-scan, 90° XY-scan, and 67° Rot-scan). Synchrotron X-ray energy-dispersive diffraction (EDXRD) combined with optical profilometry was used to study residual stress (RS) distribution and distortion upon removal of the specimens from the baseplate. The microstructural characterization of both the bulk and the near-surface regions was conducted using scanning electron microscopy (SEM) and electron backscatter diffraction (EBSD). On the top surfaces of the specimens, the highest RS values are observed in the Y-scan specimen and the lowest in the Rot-scan specimen, while the tendency is inversed on the side lateral surfaces. A considerable amount of RS remains in the specimens after their removal from the baseplate, especially in the Y- and Z-direction (short specimen dimension and building direction (BD), respectively). The distortion measured on the top surface following baseplate thinning and subsequent removal is mainly attributed to the amount of RS released in the build direction. Importantly, it is observed that the additive manufacturing microstructures challenge the use of classic theoretical models for the calculation of diffraction elastic constants (DEC) required for diffraction-based RS analysis. It is found that when the Reuß model is used for the calculation of RS for different crystal planes, as opposed to the conventionally used Kröner model, the results exhibit lower scatter. This is discussed in context of experimental measurements of DEC available in the literature for conventional and additively manufactured Ni-base alloys.

Subjects: 2000 Materials science and technology > 2003 Metallurgy/metals/alloys
2100 Mechanical engineering > 2100 Mechanical engineering
Department: Department of Mechanical Engineering
Funders: Projekt DEAL
PolyPublie URL: https://publications.polymtl.ca/9258/
Journal Title: Journal of Materials Science (vol. 56, no. 9)
Publisher: Springer Nature
DOI: 10.1007/s10853-020-05553-y
Official URL: https://doi.org/10.1007/s10853-020-05553-y
Date Deposited: 24 Mar 2022 11:22
Last Modified: 16 May 2023 16:34
Cite in APA 7: Serrano-Munoz, I., Fritsch, T., Mishurova, T., Trofimov, A., Apel, D., Ulbricht, A., Kromm, A., Hesse, R., Evans, A., & Bruno, G. (2021). On the interplay of microstructure and residual stress in LPBF IN718. Journal of Materials Science, 56(9), 5845-5867. https://doi.org/10.1007/s10853-020-05553-y

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