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Meeting TMS Specialty Congress 2025
Symposium 8th World Congress on Integrated Computational Materials Engineering (ICME 2025)
Presentation Title An ICME-Based Approach to Determine the Effect of Microscale Residual Stresses on the Fatigue Strength of Solution Strengthened Ferritic Ductile Irons
Author(s) Lutz Horbach, Xuemei Lyu, Felix Weber, Alexander Bezold, Christoph Broeckmann
On-Site Speaker (Planned) Lutz Horbach
Abstract Scope Solution strengthened ferritic ductile irons (SSF-DI) are characterised by improved mechanical properties compared to conventional cast irons, with a microstructure defined by graphite nodules embedded in a ferritic matrix. Cooling to ambient temperature causes microstructural residual stresses due to thermal contraction mismatches and phase transitions. These stresses, concentrated around the graphite nodules, lead to local plastic deformation and potential crack initiation sites. Experimental determination of residual stresses is complex and numerical models are required to accurately predict them and their effect on fatigue performance in cyclically loaded components. The ICME-based approach developed in this study provides a tool for the determination of local mechanical properties of SSF-DI and contributes to an increase in efficiency in the design of structural components. The approach consists of coupling two FEM models, one to calculate residual stresses as a function of process conditions, considering phase transitions, and a subsequent model to simulate fatigue performance.
Proceedings Inclusion? Undecided

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