Project Details
Projekt
Quantification of the influences of composition and microstructure on the mechanisms of FGA formation in quenched and tempered steels by in situ testing and high-resolution analysis
Subject Area
Thermodynamics and Kinetics as well as Properties of Phases and Microstructure of Materials
Term
since 2024
Project identifier
Deutsche Forschungsgemeinschaft (DFG) - Project number 523648868
The proposed project aims to systematically investigate the formation mechanism of fine granular area (FGA) using nano-characterization approaches and in situ VHCF experiments, focusing on correlating the local chemistry, material strength, micro-/nanostructure with the occurrence of FGA. Using high-resolution characterization and 3D-resolving in-situ techniques, this sub-project enables a cycle-resolved elucidation of the mechanisms of FGA formation, fatigue crack initiation and crack propagation. TP4 will contribute to identifying the critical roles of local microstructure and local chemistry in the formation of FGA, in order to elaborate the mechanism of FGA formation with quantitative understanding. The FGA formation under defined boundary conditions will be comprehensively studied in combination with other TPs. The complementary knowledge and testing techniques will contribute to the comprehensive understanding of micro-/nanostructure change in relation with fatigue damaging. The correlative investigation of FGA formation using 3D atom probe (APT) and transmission electron microscopy (TEM) in this phase will contribute to understand the nanostructures based on local chemistry and dislocation behaviors, in order to initiate targeted alloying measures in the 2nd phase of FOR. The mitigation strategy to resisting FGA formation and fatigue damaging will be focused in the 2nd phase.
DFG Programme
Research Units
