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Effect of coiling treatment on microstructural development and precipitate strengthening of a strip cast steel

Dorin, Thomas, Wood, Kathleen, Taylor, Adam, Hodgson, Peter and Stanford, Nicole 2016, Effect of coiling treatment on microstructural development and precipitate strengthening of a strip cast steel, Acta materialia, vol. 115, pp. 167-177, doi: 10.1016/j.actamat.2016.05.043.

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Title Effect of coiling treatment on microstructural development and precipitate strengthening of a strip cast steel
Author(s) Dorin, ThomasORCID iD for Dorin, Thomas orcid.org/0000-0002-1033-961X
Wood, Kathleen
Taylor, Adam
Hodgson, Peter
Stanford, Nicole
Journal name Acta materialia
Volume number 115
Start page 167
End page 177
Total pages 11
Publisher Elsevier
Place of publication Amsterdam, The Netherlands
Publication date 2016-08-15
ISSN 1359-6454
Keyword(s) strip casting
precipitation
atom probe tomography
small angle scattering
Summary The 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.
Language eng
DOI 10.1016/j.actamat.2016.05.043
Field of Research 091207 Metals and Alloy Materials
0912 Materials Engineering
0913 Mechanical Engineering
Socio Economic Objective 970109 Expanding Knowledge in Engineering
HERDC Research category C1 Refereed article in a scholarly journal
ERA Research output type C Journal article
Copyright notice ©2016, Acta Materialia
Persistent URL http://hdl.handle.net/10536/DRO/DU:30085697

Document type: Journal Article
Collection: Institute for Frontier Materials
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Created: Fri, 26 Aug 2016, 14:04:36 EST

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