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2021
Conference Paper
Titel
High silicon nodular cast iron for lightweight optimized cast components
Abstract
Components for wind energy turbines, heavy industry or automotive application made of nodular cast iron have growing performance requirements. In addition to the classic ferritic and pearlitic nodular graphite cast iron new high silicon solid solution strengthened grades have been developed. These grades with a full ferritic matrix provide higher quasi-static properties, especially a higher elongation at break. Nevertheless, for the standardized silicon nodular cast iron grades ENGJS-450-18, EN-GJS-500-14 and EN-GJS-600-10 there is still a high lack of knowledge regarding the fatigue and fracture mechanical behavior. In a research project the cyclic material behavior is investigated in cooperation with partners from various branches of industry, especially from the wind energy sector. For this purpose, casting samples and serial components of different wall thicknesses were cast from the nodular cast iron grades EN-GJS-450-18, EN-GJS-500-14 and EN-GJS-600-10. Specimens of different sizes are removed from these casting samples and components to determine the cyclic material behavior by stress and strain controlled fatigue tests. The aim of the investigation is to determine the technological (wall thickness), geometrical and statistical size effects (specimen size) for the three different materials and to combine this information in a fatigue assessment concept for all types of small and large cast components. In addition, all gathered data are compared with casting simulation. This enables the evaluation of the local fatigue strength already in the design phase by providing fatigue data by means of casting simulation.