Post-processing metallurgy of additively manufactured iron aluminides

本项目将以Fe3Al基铁铝化物为模型材料，研究添加剂制造和热成形的工艺组合，以解决通过后续热锻造步骤添加制造的样品的气孔闭合行为和组织细化问题。该项目的主要目的是了解Fe-Al-Ta铁系铝化物在激光粉床熔化(LPBF)过程中组织演变的基本原理。该项目旨在优化添加剂制造参数(层厚度、扫描速度)和后处理(热锻造)，以生产具有细晶和无缺陷结构的Fe-Al-Ta铁铝化物样品。此外，还将研究以牺牲材料密度和质量为代价来加速AM工艺的可能性，这些材料密度和质量稍后将通过后续的热锻造工艺进行重新调整。研究了AM和热成形相结合的工艺在闭合气孔和通过动态再结晶细化组织方面的优势。在提议的项目中创造的知识可用于以更高的质量更有效、更低成本、更快地生产特定部件(例如涡轮叶片部件)。

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.