In stage I of thermal fatigue failure lattice defects accumulate in the metallic matrix of cast iron. Impurity atoms pass into solution and collect at dislocations, leading to hardening as thermal cycling is continued.
Holding after thermal cycling leads to partial restoration of the condition and the properties, the extent and rate of which depend on the number of thermal cycles, i.e., the dislocation density and the holding time. The change in the kinetics of recovery when cracks occur is explained by the lower dislocation density in this case.
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Zhukov, A.A., Drapkin, B.M. Investigation of thermal fatigue failure of cast iron by the internal friction method. Met Sci Heat Treat 17, 354–356 (1975). https://doi.org/10.1007/BF00663407
- Thermal Cycling
- Dislocation Density
- Cast Iron