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Three-dimensional study of nodule clustering and heterogeneous strain localization for tailored material properties in ductile iron
Jönköping University, School of Engineering, JTH, Materials and Manufacturing.ORCID iD: 0000-0003-2671-9825
Jönköping University, School of Engineering, JTH, Materials and Manufacturing.ORCID iD: 0000-0003-0899-8939
Jönköping University, School of Engineering, JTH, Materials and Manufacturing.ORCID iD: 0000-0002-3184-7592
Department of Physics, Faculty of Natural Sciences, Norwegian University of Science and Technology, NTNU, Trondheim, Norway.
2019 (English)In: IOP Conference Series: Materials Science and Engineering, Institute of Physics (IOP), 2019, Vol. 529, no 1, article id 012078Conference paper, Published paper (Refereed)
Abstract [en]

Tailored heterogeneous distributions of microstructural features enable extraordinary material performance in biological and physiological structures such as trees, the aortic arch, human teeth and dinosaur skulls. In ductile iron, a heterogeneous distribution in size and morphology of graphite nodules and variations of the fractions of ferrite and pearlite are created during solidification, and varies as a function of parameters such as local cooling rate, segregation and flow. In the current work, the size distribution as well as the orientation and relation between graphite nodules is obtained by a three-dimensional reconstruction of a ductile iron microstructure from X-ray tomography. The effect of the nodule morphology and clustering on the localization of plastic strains is studied numerically using finite element analysis of the reconstructed microstructure. Real castings have a variation in geometry, solidification conditions and are subjected to variations in loads. A framework for optimized geometry and solidification conditions in order to design and deliver castings with tailored local material performance is proposed.

Place, publisher, year, edition, pages
Institute of Physics (IOP), 2019. Vol. 529, no 1, article id 012078
Series
IOP Conference Series: Materials Science and Engineering, ISSN 1757-8981 ; 529:1
Keywords [en]
Biological materials, Cutting tools, Ductility, Graphite, Iron, Microstructure, Morphology, Refining, Strain, Heterogeneous distributions, Heterogeneous strain, Material performance, Microstructural features, Optimized geometries, Physiological structures, Solidification condition, Three-dimensional reconstruction, Solidification
National Category
Metallurgy and Metallic Materials
Identifiers
URN: urn:nbn:se:hj:diva-45336DOI: 10.1088/1757-899X/529/1/012078Scopus ID: 2-s2.0-85067865845OAI: oai:DiVA.org:hj-45336DiVA, id: diva2:1337192
Conference
Joint 5th International Conference on Advances in Solidification Processes, ICASP 2019 and 5th International Symposium on Cutting Edge of Computer Simulation of Solidification, Casting and Refining, CSSCR 2019, 17-21 June 2019
Available from: 2019-07-12 Created: 2019-07-12 Last updated: 2019-07-12Bibliographically approved

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Olofsson, JakobSalomonsson, KentDahle, Arne

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