Microstructure influence on crack propagation behavior of nodular cast iron

This paper offers a comprehensive analysis of the crack propagation behavior of a specific type of Nodular Cast Iron (NCI) and its correlation with microstructural morphology. To estimate da/dN vs K curves, crack propagation tests were conducted utilizing Compact Test Specimens (CTS). Additionally, Scanning Electron Microscopy Analysis was employed to characterize the microstructure morphology on the surfaces of the fractured specimens, with specific attention to the size and distribution of graphite nodules within the ferritic matrix. The findings of the study suggest that the position from which the CTS is extracted is contingent upon the graphite distribution, which could have a noteworthy impact on the crack propagation behavior of the investigated NCI alloy.