Post-processing of laser powder bed-fused IN625 components for better mechanical properties,surface finish and tolerances

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The proposed research will develop and validate a set of bulk- and surface- post-processing technologies applicable to high-temperature IN625 components produced by laser powder-bed fusion (L-PBF) - for better mechanical properties, surface finish and tolerances. In the framework of this project, an extended study of the post processing-microstructure-properties interrelations will be carried out. As a result, an original sequence of heat and HIP treatment will be developed to avoid precipitation of intergranular carbide particles reducing material ductility at high temperatures. Next, significant data on the high temperature mechanical properties of IN625 alloy, including creep resistance, will be generated. Moreover, a set of finishing technologies capable of significantly decreasing internal surface roughness of L-PBF tubular components will be developed, validated and prepared for industrial deployment. Three finishing technologies will be tested comparatively and in combination: electropolishing, abrasive flow machining and chemical-mechanical polishing. Finally, multifaceted metrics of the surface topology assessment and geometrical tolerancing of L-PBF components with finishing technologies will be developed to allow for reliable design and certification of IN625 components for aerospace applications.