SKM 2023 – wissenschaftliches Programm

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MM: Fachverband Metall- und Materialphysik

MM 20: Topical Session: Fundamentals of Fracture – Microstructure Impact on Fracture (Experiments)

MM 20.3: Vortrag

Dienstag, 28. März 2023, 14:45–15:00, SCH A 216

Microstructural damage analysis in a DP800 steel subjected to complex strain paths — •Maximilian A. Wollenweber, Luiz R. Guimarães, Nicole Lohrey, Setareh Medghalchi, Talal Al-Samman, and Sandra Korte-Kerzel — RWTH Aachen, Aachen, Germany

During forming processes, initiation and evolution of microstructural damage sites have a strong negative influence on the mechanical properties of the finished product. It is therefore important to investigate the damage behavior during deformation and unravel its relationship with the strain path. The current work investigates the microscopic damage evolution in a dual-phase steel DP800 subjected to different loading scenarios in tension and bending. The aim is to elucidate how the strain path influences the initiation and growth of microstructural damage in order to design more damage-tolerant industrial forming processes. The methods used comprise machine-learning algorithms and in-situ testing in a scanning electron microscope to observe and classify damage sites in the deformed samples. The results show that strain hardening inhibits damage formation, while pre-existing damage sites tend to facilitate further damage formation.