Performance evaluation of Charpy impact tests to investigate and detect process defects of a Ni-based superalloy elaborated by laser powder bed fusion

Additive manufacturing is a robust process for building complex parts with improved mechanical properties. However, if a problem occurs during manufacturing, the production batch will present microstructural defects that reduce the mechanical properties and reliability of the part. Part post-process...

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Bibliographic Details
Main Authors: A. Ty, M. Mokhtari, Y. Balcaen, A. Votié, J.-M. Cloué, J. Alexis
Format: Article
Language:English
Published: Elsevier 2023-07-01
Series:Journal of Materials Research and Technology
Subjects:
Online Access:http://www.sciencedirect.com/science/article/pii/S2238785423015922
Description
Summary:Additive manufacturing is a robust process for building complex parts with improved mechanical properties. However, if a problem occurs during manufacturing, the production batch will present microstructural defects that reduce the mechanical properties and reliability of the part. Part post-processing represents a significant production time and production cost. Therefore, it is necessary to find a fast, simple, cheap, and efficient test to check production batch quality. High deformation rate tests are promising. We performed the Charpy impact test with reduced-size samples to investigate a specific height where defects may be suspected or critical. Charpy impact test's ability to detect an intentionally introduced defect in a tested sample is studied, involving exploitation of force-displacement data recorded during the test on reduced-size samples. For a defect localized within the notch plane, the results show that reduced-size samples allow for detecting a localized defect. Resilience values are reduced by 10%, and the force-displacement curves show a divergence in the propagation regime. Defects shifted from the notch plane are also detected, but not more than 500 μm, allowing the detection of production batch break.
ISSN:2238-7854