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

拟议的研究将开发和验证一套适用于激光粉末床熔合（L-PBF）生产的高温IN625部件的批量和表面后处理技术，以获得更好的机械性能、表面光洁度和公差。**在这个项目的框架内，将进行后处理-微观结构-性能相互关系的扩展研究。因此，为了避免在高温下析出降低材料延展性的晶间碳化物颗粒，将开发出一套原始的热处理和HIP处理顺序。接下来，将产生有关IN625合金高温力学性能的重要数据，包括抗蠕变性能。此外，一套能够显著降低L-PBF管状部件内表面粗糙度的精加工技术将被开发、验证并准备用于工业部署。将对电抛光、磨料流加工和化学机械抛光三种抛光技术进行对比和组合试验。最后，采用精加工技术的L-PBF组件的表面拓扑评估和几何公差的多方面指标将被开发，以允许IN625组件用于航空航天应用的可靠设计和认证。* * * * * *

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. ******