University of Oulu

Suresh Kodukula, Pentti Karjalainen, David Porter, Influence of Micro-texture Distribution and Straining Direction on the Ridging of Ferritic Stainless Steels, ISIJ International, 2021, Volume 61, Issue 3, Pages 975-984, Released March 17, 2021, [Advance publication] Released January 23, 2021, Online ISSN 1347-5460, Print ISSN 0915-1559,

Influence of micro-texture distribution and straining direction on the ridging of ferritic stainless steels

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Author: Kodukula, Suresh1,2; Karjalainen, Pentti2; Porter, David2
Organizations: 1Outokumpu Process R&D, Tornio, 95490 Finlan
2Materials and Mechanical Engineering, Centre for Advanced Steels Research, University of Oulu, 90014 Oulu, Fin
Format: article
Version: published version
Access: open
Online Access: PDF Full Text (PDF, 2.9 MB)
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Language: English
Published: Iron and Steel Institute of Japan, 2021
Publish Date: 2021-05-10


Ridging means the appearance of surface profile undulations, i.e. peaks and valleys, as a result of plastic strain. The reasons for the different ridging behaviour of industrially produced, stabilized ferritic stainless steel sheets (EN 1.4509) have been investigated after straining in the rolling and transverse directions with low and high resistance towards ridging. The evolution of macro-texture has been measured by X-ray diffraction (XRD) both before and after ridging tests in the rolling and transverse directions. The macro texture results showed that straining along the rolling direction strengthened the α fibre whereas the γ fibre was strengthened by grain rotations after straining along transverse direction. Electron backscatter diffraction (EBSD) imaging was used to establish the micro-textural variations over the thickness of the sheets among the high and low ridging materials. Mean orientations of individual grains determined from the EBSD data were utilized to calculate plastic strain ratio r-values by considering all slip systems weighted according to their Schmid factors. The calculated r-values were used to predict the ridging surface profile after straining along the rolling and transverse directions. The results demonstrated the influence of local variations in micro-texture on the severity of ridging.

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Series: ISIJ international
ISSN: 0915-1559
ISSN-E: 1347-5460
ISSN-L: 0915-1559
Volume: 61
Issue: 3
Pages: 975 - 984
DOI: 10.2355/isijinternational.ISIJINT-2020-610
Type of Publication: A1 Journal article – refereed
Field of Science: 216 Materials engineering
Copyright information: © 2021 The Iron and Steel Institute of Japan. This is an open access article under the terms of the Creative Commons Attribution-NonCommercial-NoDerivs license (