Project Details
Projekt
Characterization of Inhomogeneities Caused by Production within DED-LB/M Structures and Their Impact on Local Phase Stabilities and Mechanical Properties
Subject Area
Materials in Sintering Processes and Generative Manufacturing Processes
Term
since 2025
Project identifier
Deutsche Forschungsgemeinschaft (DFG) - Project number 512940050
The content of this sub-project is the material characterization and optimization of microstructures resulting from the wire-based DED-LB process as well as the identification of relationships between local microstructural properties and macroscopic behavior under mechanical load. The materials DIN EN 1.4404 and DIN EN 1.4306 as well as a high interstitial austenitic CrMn steel (HIS) are considered as model alloys. These materials are high-alloyed Fe-based systems with varying austenite stability at room temperature, in all three cases with pronounced segregation effects. In addition, the process-related layer structure and toughness of the microstructure have to be considered, resulting in directional properties. It is therefore planned to correlate load curves in components with welding vectors in the manufacturing process and their influence on the ductility. Detailed microstructural investigations of specimens before and after a quasi-static or dynamically applied load form an experimental focus in this sub-project, accompanied by thermodynamic calculations of local phase stabilities and the derivation of property distribution maps. In addition, the post-processing of the components manufactured using DED-LB is considered, either by means of a purely thermal post-treatment (vacuum heat treatment) or a thermo-mechanical post-treatment (hot-isostatic pressing). The sub-project is coordinated in detail and closely cross-linked with the work program of the other sub-projects within the research group. The work program and the objectives therefore contribute to answering the research questions of the entire group.
DFG Programme
Research Units
