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| Naji, M. |
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| Petrov, R. H. | Madrid |
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| Ali, M. A. |
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| Rančić, M. |
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| Azevedo, Nuno Monteiro |
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Terziyski, J.
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The Effect of Strain Reversal and Strain-Time Path on Constitutive Relationships for Metal Rolling/Forming Processes
Abstract
In this multi-partner, multinational project the overall aim was to obtain a greater understanding of metal deformation during rolling and other forming processes where changes in strain rate and temperature may occur and where the material is subjected to reversals in shear strain during deformation. The constitutive behaviour of CMn, CMn-Nb and 316 stainless steels were investigated experimentally by means of complex strain and temperature histories on both flow stress and microstructural evolution were investigated. Partial re-crystallization and post dynamic softening under the accumulated strain in the course of multi-pass deformation were investigated by means of hot torsion tests.<br/>Constitutive models with varying degrees of complexity were developed. These models ranged from simplified models for incorporation into analytical models of rolling to more complex viscoplastic models for incorporation into finite element (FE) models of rolling by means of a user defined material subroutine (UMAT). Even more complex constitutive models were developed utilizing dislocation density as a history parameter in order to predict the evolution of flow stress with complex thermomechanical history and taking account of microstructural influences such as recrystallization and grain growth.<br/>FE models of rolling utilizing the new constitutive laws were investigated in relation to schedules in a full-scale hot-strip mill. Also, the constitutive models for damage evolution in duplex stainless steels were incorporated into FE models of rolling and used to investigate the occurrence of edge cracks and sliver defects in full-scale hot-strip rolling