Dislocation distribution, crystallographic texture evolution, and plastic inhomogeneity of Inconel 718 fabricated by laser powder bed fusion
Author(s)
Al-Lami, Jalal
Dessolier, Thibaut
Rogers, Samuel R
Pirzada, Talha
Pham, Minh-Son
Type
Journal Article
Abstract
Plastic inhomogeneity, particularly localized strain, is one of the main mechanisms responsible for failures in engineering alloys. This work studies the spatial arrangement and distribution of microstructure (including dislocations and grains) and their influence in the plastic inhomogeneity of Inconel 718 fabricated by additive manufacturing (AM). The bidirectional scanning strategy with no interlayer rotation results in highly ordered alternating arrangements of coarse Goss-like {110}<001> textured grains separated by fine Cube-like {100}<001> textured grains. The bidirectional strategy also results in an overall high density of geometrically necessary dislocations (GNDs) that are particularly dense in the fine grains. Although the Cube-like texture desirable for isotropy is dominant, it gradually weakens during plastic deformation and the undesirable Goss-like component (second most dominant in the as-built microstructure) increases. The highly clustered and bimodal distribution of fine and coarse grains, textures, and GND densities causes fast localized roughening during deformation, particularly along the line row of fine Cube-like grains. However, the chessboard strategy results in a lower GND density and a comparatively more random distribution of crystallographic texture and GNDs, with a dominant Cube-like component (and much lower Goss-like texture) that remains stable throughout plastic deformation. This results in more uniform deformation, reducing plastic inhomogeneity.
Date Issued
2025-05-06
Date Acceptance
2024-05-05
Citation
Advanced Engineering Materials, 2025, 27 (9)
ISSN
1438-1656
Publisher
Wiley
Journal / Book Title
Advanced Engineering Materials
Volume
27
Issue
9
Copyright Statement
© 2024 The Authors. Advanced Engineering Materials published by Wiley-VCH GmbH
This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.
This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.
License URL
Identifier
https://onlinelibrary.wiley.com/doi/10.1002/adem.202400524
Subjects
ALLOY
crystallographic texture
dislocations
FATIGUE BEHAVIOR
GRAIN-ORIENTATION
Inconel 718
laser powder bed fusion
Materials Science
Materials Science, Multidisciplinary
MECHANICAL-PROPERTIES
METALLIC COMPONENTS
MICROSTRUCTURE
plastic inhomogeneity
RESIDUAL-STRESS
SCAN STRATEGY
Science & Technology
SITE-SPECIFIC CONTROL
STAINLESS-STEEL
strain localization
Technology
Publication Status
Published
Article Number
2400524
Date Publish Online
2024-05-05