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  Modeling of a thermomechanical process chain for sheet steels

Barthel, C., Klusemann, B., Denzer, R., & Svendsen, B. (2013). Modeling of a thermomechanical process chain for sheet steels. International Journal of Mechanical Sciences, 74, 46-54. doi:10.1016/j.ijmecsci.2013.04.006.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-0027-A17F-C Version Permalink: http://hdl.handle.net/11858/00-001M-0000-0027-A182-2
Genre: Journal Article

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 Creators:
Barthel, Clemens1, Author              
Klusemann, Benjamin2, Author              
Denzer, Ralf3, Author              
Svendsen, Bob4, 5, Author              
Affiliations:
1Material Mechanics, RWTH Aachen University, 52062 Aachen, Germany, ou_persistent22              
2Hamburg University of Technology, Institute of Continuum Mechanics and Materials Mechanics, Hamburg, Germany, ou_persistent22              
3Institute of Mechanics, TU Dortmund, 44221 Dortmund, Germany, ou_persistent22              
4Material Mechanics, Faculty of Georesources and Materials Engineering, RWTH Aachen University, Schinkelstraße 2, D-52062 Aachen, Germany, ou_persistent22              
5Microstructure Physics and Alloy Design, Max-Planck-Institut für Eisenforschung GmbH, Max Planck Society, ou_1863381              

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Free keywords: Anisotropic hardening; Phase change; Rate dependence; Sheet steel; Thermomechanical process chain
 Abstract: The purpose of this work is the development, identification and validation of a model for the simulation of a thermomechanical multistage production process chain for sheet steels. The process of interest consists of forming (in particular deep-drawing) followed by cutting and heat treatment. For the forming and cutting stages, the complete model is based in particular on a model for thermoelastic, viscoplastic (i.e., rate-dependent) material behavior in sheet steels accounting for isotropic and anisotropic (i.e., kinematic and cross) hardening. This is combined with a model for thermally induced phase transformations in order to model heat treatment. The particular material modeled here is the sheet steel LH800 (R). This steel has an initially ferritic microstructure which is maintained during forming and cutting. Heating of the workpiece after forming and cutting during heat treatment phase results in transformation of ferrite to austenite. Subsequent air-cooling back to room temperature is accompanied by a second transformation from austenite to martensite. Model predictions for the workpiece behavior during forming and cutting show quite good agreement with corresponding experimental results. In contrast, small discrepancies between the model predictions and experimental results for the change in workpiece geometry during cooling imply that the phase transformation from austenite to martensite in LH800 (R) is not purely volumetric in nature as assumed in the model. Rather, it results in change in the deviatoric state of stress in the material and a corresponding change in shape of the workpiece. (C) 2013 Elsevier Ltd. All rights reserved.

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Language(s): eng - English
 Dates: 2013-09
 Publication Status: Published in print
 Pages: 9
 Publishing info: -
 Table of Contents: -
 Rev. Method: -
 Degree: -

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Title: International Journal of Mechanical Sciences
  Other : IJMS
  Abbreviation : Int. J. Mech. Sci.
Source Genre: Journal
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Publ. Info: Oxford, England : Elsevier Limited
Pages: - Volume / Issue: 74 Sequence Number: - Start / End Page: 46 - 54 Identifier: ISSN: 0020-7403
CoNE: /journals/resource/0020-7403