Print Email Facebook Twitter Modelling study on the three-dimensional neutron depolarisation response of the evolving ferrite particle size distribution during the austenite–ferrite phase transformation in steels Title Modelling study on the three-dimensional neutron depolarisation response of the evolving ferrite particle size distribution during the austenite–ferrite phase transformation in steels Author Fang, H. (TU Delft Novel Aerospace Materials; Tsinghua University) van der Zwaag, S. (TU Delft Novel Aerospace Materials; Tsinghua University) van Dijk, N.H. (TU Delft RST/Fundamental Aspects of Materials and Energy) Date 2018-04-24 Abstract The magnetic configuration of a ferromagnetic system with mono-disperse and poly-disperse distribution of magnetic particles with inter-particle interactions has been computed. The analysis is general in nature and applies to all systems containing magnetically interacting particles in a non-magnetic matrix, but has been applied to steel microstructures, consisting of a paramagnetic austenite phase and a ferromagnetic ferrite phase, as formed during the austenite-to-ferrite phase transformation in low-alloyed steels. The characteristics of the computational microstructures are linked to the correlation function and determinant of depolarisation matrix, which can be experimentally obtained in three-dimensional neutron depolarisation (3DND). By tuning the parameters in the model used to generate the microstructure, we studied the effect of the (magnetic) particle size distribution on the 3DND parameters. It is found that the magnetic particle size derived from 3DND data matches the microstructural grain size over a wide range of volume fractions and grain size distributions. A relationship between the correlation function and the relative width of the particle size distribution was proposed to accurately account for the width of the size distribution. This evaluation shows that 3DND experiments can provide unique in situ information on the austenite-to-ferrite phase transformation in steels. Subject grain size distributionmagnetisationNeutron scatteringphase transformationsteel To reference this document use: http://resolver.tudelft.nl/uuid:1ad3f2d5-2e06-4517-8d15-ca8df70132e7 DOI https://doi.org/10.1080/14786435.2018.1465239 ISSN 1478-6435 Source Philosophical Magazine (London, 2003), 1-16 Part of collection Institutional Repository Document type journal article Rights © 2018 H. Fang, S. van der Zwaag, N.H. van Dijk Files PDF 14786435.2018.1465239.pdf 3.08 MB Close viewer /islandora/object/uuid:1ad3f2d5-2e06-4517-8d15-ca8df70132e7/datastream/OBJ/view