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Effect of coiling treatment on microstructural development and precipitate strengthening of a strip cast steel
journal contribution
posted on 2016-08-15, 00:00 authored by Thomas DorinThomas Dorin, K Wood, Adam Taylor, Peter HodgsonPeter Hodgson, N StanfordThe effect of a simulated coiling treatment on a strip cast Nb-containing steel has been investigated. A lath ferritic supersaturated microstructure was observed in the as-cast condition with no coiling. The microstructure remained lath like during coiling at high temperature (850 °C) and the formation of chemically complex Nb-rich precipitates containing C, N, Si and S was observed. Coiling at an intermediate temperature (700 °C) caused the formation of polygonal ferrite with a dendritic morphology due to chemical micro-segregation. The polygonal ferrite contained Nb(C,N) precipitates. The microstructure remained lath like at the lowest coiling temperature (600 °C). In the latter case the precipitation of Nb-rich clusters was observed, and atom probe tomography revealed them to be ∼85% Fe. Small angle neutron scattering and transmission electron microscopy were used to quantify precipitation kinetics during coiling and the mechanical properties were evaluated with a shear punch apparatus. A yield strength model was developed to describe the observed mechanical behaviour, and this showed that the two largest contributors to strength were the bainitic microstructure and the Nb-rich precipitates. Strategies to further strengthen these materials are suggested.
History
Journal
Acta materialiaVolume
115Pagination
167 - 177Publisher
ElsevierLocation
Amsterdam, The NetherlandsPublisher DOI
ISSN
1359-6454Language
engPublication classification
C Journal article; C1 Refereed article in a scholarly journalCopyright notice
2016, Acta MaterialiaUsage metrics
Categories
Keywords
strip castingprecipitationatom probe tomographysmall angle scatteringScience & TechnologyTechnologyMaterials Science, MultidisciplinaryMetallurgy & Metallurgical EngineeringMaterials ScienceANGLE NEUTRON-SCATTERINGCARBONITRIDE PRECIPITATIONNIOBIUMKINETICSSULFIDEALLOYMechanical EngineeringCondensed Matter Physics
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