University of Oulu

A. Kaijalainen et al 2018 IOP Conf. Ser.: Mater. Sci. Eng. 375 012026

Development of crystallographic texture under plane and shear strain in ultrahigh-strength strip steels

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Author: Kaijalainen, A.1; Javaheri, V.1; Lindell, D.2;
Organizations: 1Materials and Production Engineering, University of Oulu, Finland
2Swerea KIMAB, Stockholm, Sweden
Format: article
Version: published version
Access: open
Online Access: PDF Full Text (PDF, 2.3 MB)
Persistent link: http://urn.fi/urn:nbn:fi-fe2018062826579
Language: English
Published: IOP Publishing, 2018
Publish Date: 2018-06-28
Description:

Abstract

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.

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Series: IOP conference series. Materials science and engineering
ISSN: 1757-8981
ISSN-E: 1757-899X
ISSN-L: 1757-8981
Volume: 375
Article number: 012026
DOI: 10.1088/1757-899X/375/1/012026
OADOI: https://oadoi.org/10.1088/1757-899X/375/1/012026
Host publication: 18th International Conference on Textures of Materials (ICOTOM-18) 6–10 November 2017, St George, Utah, USA
Conference: 18th International Conference on Textures of Materials (ICOTOM-18) 6–10 November 2017, St George, Utah, USA
Type of Publication: A4 Article in conference proceedings
Field of Science: 216 Materials engineering
Subjects:
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