Abstract
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.
Highlights
The mechanical properties of cast iron depend strongly on the microscopic morphology and distribution of the graphite particles present in the iron matrix
It is well known that spherical graphite nodules in ductile cast iron (DCI) result in better impact and fatigue resistance than graphite flakes in grey iron
The synchrotron X-ray micro-diffraction method has been used in the present study to characterize the local microstructure and residual strain pattern in matrix grains around a graphite nodule in a ductile cast iron sample
Summary
The mechanical properties of cast iron depend strongly on the microscopic morphology and distribution of the graphite particles present in the iron matrix. 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. Each of the residual strain components in the matrix grains exhibits a complex pattern along the circumferential direction of the nodule.
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