Nickel Superalloy Turbine Blade Parts Printed by Laser Powder Bed Fusion: Thermo-Mechanical Post-processing for Enhanced Surface Integrity and Precipitation Strengthening
Source abstract
Abstract
The combined thermo-mechanical technique for the post-processing of heat-resistant alloy parts fabricated by a 3D laser powder bed fusion (L-PBF) process is applied. In this study, the turbine blade test parts were printed using a nickel-based pre-alloyed INCONEL (IN) 718 powder. The hot isostatic pressing (HIP) followed by homogenization and double aging post-printing heat treatments was conducted to form a homogeneous structure of the L-PBF-built turbine blade parts, reducing the material porosity. The shot peening (SP) technique was applied to eliminate surface defects and provide a new surface texture, refining the grains in the subsurface layer. The effects of the post-heat treatments combined with mechanical surface SP treatment on the microstructure, phase/chemical composition, grain refinement, subsurface porosity, and microhardness distribution in the near-surface layers were studied in this work. The surface defects and roughness are also addressed. Results indicate that the HIP treatment followed by both used heat treatments provides the required uniformity of microstructure and distribution of the second phase precipitates in the L-PBF-built turbine blade parts, providing an increase in hardness by ~50%. Additionally, the application of the SP treatment after heat treatments led to a further surface hardening and increases the residual stress values. At the same time, the surface defects were successfully removed from the heat-treated surfaces by severe plastic deformation.
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Research context
OpenAlex topics: Additive Manufacturing Materials and Processes · Additive Manufacturing and 3D Printing Technologies · High Entropy Alloys Studies
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
References (70)
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