Synchrotron measurements of local microstructure and residual strains in ductile cast iron

Yubin Zhang, Tito Andriollo, Søren Fæster, W. Liu, A. Sturlason, R. Barabash

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The local microstructure and distribution of thermally induced residual strains in ferrite matrix grains around an individual spherical graphite nodule in ductile cast iron (DCI) were measured using a synchrotron X-ray micro-diffraction technique. It is found that the matrix grains are deformed, containing dislocations and dislocation boundaries. Each of the residual strain components in the matrix grains exhibits a complex pattern along the circumferential direction of the nodule. Along the radial direction of the nodule, strain gradients from the interface to the grain interior are seen for some strain components, but only in some matrix grains. The observed residual strain patterns have been analysed by finite element modelling, and a comparison between the simulation and experiments is given. The present study of local residual stress by both experimental characterization and simulation provide much needed information for understanding the mechanical properties of DCI, and represent an important contribution for the microstructural design of new DCI materials.
Original languageEnglish
Article number012054
JournalI O P Conference Series: Materials Science and Engineering
Number of pages7
Publication statusPublished - 2017
Event38th Risø International Symposium on Materials Science - Technical University of Denmark , Roskilde, Denmark
Duration: 4 Sept 20178 Sept 2017


Conference38th Risø International Symposium on Materials Science
LocationTechnical University of Denmark

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