|About this Abstract
||2017 TMS Annual Meeting & Exhibition
||Defects and Properties of Cast Metals
||Numerical Predictions of Local Residual Stresses around Individual Graphite Nodules in Ductile Iron and Experimental Validation
||Tito Andriollo, Niels Skat Tiedje, Jesper Thorborg, Jesper Hattel
|On-Site Speaker (Planned)
Residual stresses in ferritic ductile iron castings have been studied for decades. However, very little attention has traditionally been given to the local residual stresses which may arise in the microstructure as a result of the thermal expansion mismatch between the matrix and the graphite nodules during solid-state cooling. Recently the authors proposed a new model for calculating local residual stresses in ductile cast irons, and showed that they may be 100-150 MPa, hence of the same order of magnitude as the material macroscopic yield stress. These preliminary analyses neglected the influence of important factors such as time-dependent inelastic deformation in the ferrite. In this work, more accurate numerical estimates are proposed on the basis of a detailed experimental characterization of the thermo-mechanical behavior of the matrix at different temperatures. The results are then compared with residual stress measurements from differential aperture synchrotron X-ray microscopy.
||Planned: Supplemental Proceedings volume