Journal article · Conference paper
Synchrotron measurements of local microstructure and residual strains in ductile cast iron
Department of Wind Energy, Technical University of Denmark1
Materials science and characterization, Department of Wind Energy, Technical University of Denmark2
Department of Mechanical Engineering, Technical University of Denmark3
Manufacturing Engineering, Department of Mechanical Engineering, Technical University of Denmark4
Composites Mechanics and Materials Mechanics, Department of Wind Energy, Technical University of Denmark5
Argonne National Laboratory6
Vestas Wind Systems AS7
Oak Ridge National Laboratory8
Villum Center for Advanced Structural and Material Testing, Centers, Technical University of Denmark9
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.
Language: | English |
---|---|
Year: | 2017 |
Pages: | 012054 |
Proceedings: | 38th Risø International Symposium on Materials Science |
ISSN: | 1757899x and 17578981 |
Types: | Journal article and Conference paper |
DOI: | 10.1088/1757-899X/219/1/012054 |
ORCIDs: | Zhang, Yubin , Andriollo, Tito and Fæster, Søren |