Mechanical Properties of Nodular Cast Iron
Nodular Cast Iron, also referred to as ductile iron or spheroidal graphite iron, is a group of irons in which the graphite forms as nodules (spherical) instead of flakes as in normal cast iron. Nodulizing elements, typically magnesium, are used to allow the solidification of the graphite into nodules. Due to different manufacturing processes a wide range of mechanical properties are observalble, care must be taken when comparing stress-strain or fatigue data. 
Stress-strain plots for Nodular Cast Iron
Fatigue Life plots for Nodular Cast Iron
- ↑ Neu, R. W. "Performance and Characterization of TWIP Steels for Automotive Applications." Materials Performance and Characterization 2.1 (2013): 244-284.