Unravelling Anisotropy Evolution during Spiral Pipe Forming: a Multiscale Approach

Procedia Manufacturing, vol. 47, pp. 1434–1441

Abstract

Spiral forming of bainitic steel coils into large diameter pipes involves a complex deformation history with several strain path changes. These lead to mechanical properties on pipe which are macroscopically different compared to coil. A detailed understanding of the property evolution during spiral pipe forming is crucial to tailor the coil material and to ensure safe pipe operation. However, it has proven difficult to correctly reproduce the anisotropic strength evolution during pipe forming with available phenomenological hardening models. Unravelling the factors contributing to macroscopic anisotropy is inherently a multi-scale problem due to the complex microstructures exhibited by modern bainitic linepipe steels. They promote a large Bauschinger effect, aside from cross loading-effects and more or less pronounced Lüders banding. Here, we present selected experimental and numerical results related to our efforts to predict the mechanical properties of bainitic steel pipes manufactured from hot rolled coils. Across the scales, we consider sources for anisotropy, such as residual stresses, crystallographic texture and grain substructure. A dislocation-based crystal plasticity model incorporated into a computationally efficient hierarchical multi-scale forming simulation is employed to predict texture and strength changes.

Authors 7

1. Matthias Bönisch corresponding

   KU Leuven

   Affiliation as printed

   KU Leuven, Department of Materials Engineering, Kasteelpark Arenberg 44, box 2450, 3001 Leuven, Belgium

   Department of Pharmaceutical and Pharmacological Sciences, KU Leuven (Leuven - Belgium)

2. Albert Van Bael

   KU Leuven

   Affiliation as printed

   KU Leuven, Department of Materials Engineering, Kasteelpark Arenberg 44, box 2450, 3001 Leuven, Belgium

   Department of Pharmaceutical and Pharmacological Sciences, KU Leuven (Leuven - Belgium)

3. Marc Seefeldt

   KU Leuven

   Affiliation as printed

   KU Leuven, Department of Materials Engineering, Kasteelpark Arenberg 44, box 2450, 3001 Leuven, Belgium

   Department of Pharmaceutical and Pharmacological Sciences, KU Leuven (Leuven - Belgium)

4. Pere Barriobero Vila

   Deutsches Zentrum für Luft- und Raumfahrt e. V. (DLR)

   Affiliation as printed

   German Aerospace Center (DLR), Institute of Materials Research, Linder Höhe, 51147 Cologne, Germany

   DLR - German Aerospace Center (Germany)

5. Guillermo Carlos Requena Aachen

   Deutsches Zentrum für Luft- und Raumfahrt e. V. (DLR) · RWTH Aachen University

   Affiliation as printed

   German Aerospace Center (DLR), Institute of Materials Research, Linder Höhe, 51147 Cologne, Germany

   RWTH-Aachen, Metallic Structures and Materials for Aerospace Engineering, 52062 Aachen, Germany

   DLR - German Aerospace Center (Germany)

   RWTH - Rheinisch-Westfälische Technische Hochschule Aachen University (RWTH Aachen Templergraben 55 52062 Aachen (Hausanschrift) 52056 Aachen (Postanschrift) - Germany)

6. Nuria Sanchez

   OnderzoeksCentrum voor de Aanwending van Staal · ArcelorMittal (Belgium)

   Affiliation as printed

   ArcelorMittal Global R&D Gent, OCAS NV, Pres. J. F. Kennedylaan 3, 9060 Zelzate, Belgium

   OCAS - Centre de Recherche pour l'utilisation de l'Acier (Belgium)

7. Steven Cooreman

   OnderzoeksCentrum voor de Aanwending van Staal · ArcelorMittal (Belgium)

   Affiliation as printed

   ArcelorMittal Global R&D Gent, OCAS NV, Pres. J. F. Kennedylaan 3, 9060 Zelzate, Belgium

   OCAS - Centre de Recherche pour l'utilisation de l'Acier (Belgium)