Build orientation-dependent evolution of residual stress, crystallographic texture, and mechanical anisotropy in laser powder bed-fused IN625
The mechanical anisotropy of laser powder bed-fused IN625 necessitates consideration of build orientation, as inherent directional solidification during additive manufacturing induces mechanical anisotropy and affects grain morphology, texture evolution, and mechanical behavior, thereby requiring an orientation-specific evaluation to optimize structural integrity. This paper presents the structure–property relationships of as-built specimens fabricated in three distinct build orientations. To assess orientation-dependent effects, tensile specimens were printed in three build orientations: 0°, 45°, and 90°. Grain morphology, grain size distribution, and microstructural variation were investigated using electron backscatter diffraction. The statistical distribution of grain orientation and pole figure analysis revealed significant textural variation and directional dependence, consistent with anisotropic behavior. The findings demonstrate that build orientation significantly influences the structural integrity of laser powder bed-fused IN625 components. Among the examined orientations, the 0° condition exhibits a pronounced <001> texture aligned with the build direction. Pole figure and orientation distribution function analyses confirm a dominant cube texture at 0°, which transitions to a cube–goss texture at 45°. Mechanical testing corroborates the electron backscatter diffraction results, with the 0° orientation exhibiting the highest yield strength (727 MPa) and ultimate tensile strength (963 MPa), attributed to a favorable alignment of load-bearing grains. Residual stress-assisted characterization indicates that nominal in-plane compressive stresses predominate in the 0° orientation.
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