Post-processing metallurgy of additively manufactured iron aluminides

该项目将使用基于Fe3Al的铁铝化物作为模型材料，研究增材制造和热成形的工艺组合，以解决增材制造样品在后续热锻步骤中的孔隙闭合行为和微观结构细化问题。该项目的主要目标是了解Fe-Al-Ta铁铝化物在激光粉末床熔合（LPBF）加工过程中的微观结构演变的基本原理。该项目旨在优化增材制造参数（层厚、扫描速度）和后处理（热锻），以生产具有细晶粒和无缺陷结构的Fe-Al-Ta铁铝化物样品。此外，将研究以牺牲材料密度和质量为代价加速增材制造工艺的可能性，这些材料密度和质量稍后将通过随后的热锻造工艺重新调整。将考察增材制造与热成形相结合的工艺在孔隙闭合和通过动态再结晶细化微观组织方面的优势。将在拟议项目中创建的知识可用于生产特定部件（例如，涡轮叶片部件），更有效，更低成本，更快，质量更高。

This project will use iron aluminides based on Fe3Al as model materials to examine the process combination of additive manufacturing and hot forming to address the porosity closure behavior and microstructure refinement of the additively manufactured samples by a subsequent hot forging step. The main objective of the project is to understand the fundamentals of the microstructure evolution of the Fe-Al-Ta iron aluminides during laser powder bed fusion (LPBF) processing. The project aims to optimize additive manufacturing parameters (layer thickness, scanning speed) and post-processing treatment (hot forging) to produce samples of Fe-Al-Ta iron aluminide with fine-grained and defect-free structures. Furthermore, the possibility of accelerating the AM process at the expense of material density and quality, which later will be re-adjusted by a subsequent hot forging process, will be investigated. The advantages of the process combination of AM and hot forming in terms of porosity closure and microstructure refinement through dynamic recrystallization will be examined. The knowledge that will be created in the proposed project can be used to produce specific parts (e.g., turbine blade components) more effectively, less costly, and faster with superior quality.