About this Abstract |
Meeting |
2022 Annual International Solid Freeform Fabrication Symposium (SFF Symp 2022)
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Symposium
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2022 Annual International Solid Freeform Fabrication Symposium (SFF Symp 2022)
|
Presentation Title |
Effect of Build Orientation on Residual Stress and Microstructure in Inconel 625 Fabricated via Laser Powder Bed Fusion |
Author(s) |
Mohanish Andurkar, Bart Prorok, Scott M. Thompson |
On-Site Speaker (Planned) |
Mohanish Andurkar |
Abstract Scope |
The structural integrity of parts produced by Laser Powder Bed Fusion (L-PBF) is still not at a great acceptance level. One of the major defects inherited in parts fabricated from L-PBF is high level of residual stress. In this study, three different stress relief temperatures were performed on L-PBF Inconel 625 specimens to observe effects on the residual stress magnitude and grain growth. The evolution in residual stress after heat treatment is supported by microstructure characterization via Electron Backscattered Diffraction (EBSD) and measuring mechanical properties using nano-hardness mapping. The results indicate that the as-printed samples possessed a high tensile residual stress that was subsequently relieved via the employed heat treatments. EBSD results indicate the presence of twining phenomenon in the microstructure after heat treatment thus implying recrystallization. The kernel average misorientation (KAM) map of the as-printed sample showed more pronounced local misorientation compared to heat treated samples. |
Proceedings Inclusion? |
Definite: Post-meeting proceedings |