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Development of crystallographic texture under plane and shear strain in ultrahigh-strength strip steels
University of Oulu, Finland.
University of Oulu, Finland.
RISE - Research Institutes of Sweden, Swerea, Swerea KIMAB.
University of Oulu, Finland.
2018 (English)In: IOP Conference Series: Materials Science and Engineering, 2018, Vol. 375, no 1, article id 012026Conference paper, Published paper (Refereed)
Abstract [en]

The effect of centerline and subsurface microstructures on the crystallographic texture of three 8 mm thick low-alloyed hot-rolled and direct-quenched ultrahigh-strength strip steels with yield strengths in the range 800 - 1100 MPa has been investigated. Detailed microstructural features were studied using LCSM, FESEM, FESEM-EBSD. In addition textures and crystallographic features were analyzed using Matlab combined with MTEX software. Rolling to lower finish rolling temperatures increased austenite pancaking leading to the formation of ferritic/granular bainitic and the upper bainitic microstructures at the subsurface. In addition, increased austenite pancaking was found to increase the intensities of ∼{554}<225>α, ∼{112}<110>α and ∼{112}<131>α texture components at the centerline and ∼{112}<111>α and ∼{110}<112>α/<111>α texture components in the surface layers, especially in upper bainitic microstructures. Parent austenite reconstruction shows that crystallographic texture at the centerline derived from {112}<111>γ and {110}<112>γ and the subsurface the shear texture components derived from the {112}<110>γ and {111}<112>γ components, as expected. The Matlab reconstruction code was found to work well for martensitic and upper bainitic morphologies even with the highly pancaked prior austenite structure. However, it was less precise for granular bainite and ferrite.

Place, publisher, year, edition, pages
2018. Vol. 375, no 1, article id 012026
Keywords [en]
Austenite, Bainite, Ferrite, High strength alloys, MATLAB, Microstructural evolution, Shear strain, Bainitic microstructures, Crystallographic textures, Finish rolling temperature, Microstructural features, Shear texture components, Subsurface microstructure, Texture components, Ultrahigh strength, High strength steel
National Category
Natural Sciences
Identifiers
URN: urn:nbn:se:ri:diva-34511DOI: 10.1088/1757-899X/375/1/012026Scopus ID: 2-s2.0-85049410767OAI: oai:DiVA.org:ri-34511DiVA, id: diva2:1237315
Conference
18th International Conference on Textures of Materials, ICOTOM 2017, 6 November 2017 through 10 November 2017
Available from: 2018-08-08 Created: 2018-08-08 Last updated: 2018-08-08Bibliographically approved

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