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Title: A New Modelling of Dynamic Recrystallization - Application to Blanking Process of Thin Sheet in Copper Alloy

Abstract

Blanking process is widely used by electronic and micromechanical industries to produce small and thin components in large quantities. To take into consideration the influence of strain rate and temperature on precision blanking of thin sheet in copper alloy, a thermo-elasto-visco-plastic modelling has been developed. Furthermore the blanking of thin sheet in Cual copper presents dynamic recrystallization. A new modelling of dynamic recrystallization based on the thermodynamics of irreversible processes is proposed. Blanking simulations of Cual copper sheet are performed to analyze the softening effect induced by dynamic recrystallization.

Authors:
; ; ;  [1]
  1. Universite de Franche-Comte, Institut FEMTO-ST - UMR 6174, Laboratoire de Mecanique Appliquee R. Chaleat, 24 rue de l'Epitaphe, 25000 Besancon (France)
Publication Date:
OSTI Identifier:
21057076
Resource Type:
Journal Article
Resource Relation:
Journal Name: AIP Conference Proceedings; Journal Volume: 907; Journal Issue: 1; Conference: 10. ESAFORM conference on material forming, Zaragoza (Spain), 18-20 Apr 2007; Other Information: DOI: 10.1063/1.2729595; (c) 2007 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; ACCURACY; COMPUTERIZED SIMULATION; COPPER; COPPER ALLOYS; IRREVERSIBLE PROCESSES; PLASTICITY; RECRYSTALLIZATION; SHEETS; STRAIN RATE; TEMPERATURE DEPENDENCE; THERMODYNAMICS; THERMOELASTICITY; VISCOSITY

Citation Formats

Thibaud, Sebastien, Touache, Abdelhamid, Chambert, Jerome, and Picart, Philippe. A New Modelling of Dynamic Recrystallization - Application to Blanking Process of Thin Sheet in Copper Alloy. United States: N. p., 2007. Web. doi:10.1063/1.2729595.
Thibaud, Sebastien, Touache, Abdelhamid, Chambert, Jerome, & Picart, Philippe. A New Modelling of Dynamic Recrystallization - Application to Blanking Process of Thin Sheet in Copper Alloy. United States. doi:10.1063/1.2729595.
Thibaud, Sebastien, Touache, Abdelhamid, Chambert, Jerome, and Picart, Philippe. Sat . "A New Modelling of Dynamic Recrystallization - Application to Blanking Process of Thin Sheet in Copper Alloy". United States. doi:10.1063/1.2729595.
@article{osti_21057076,
title = {A New Modelling of Dynamic Recrystallization - Application to Blanking Process of Thin Sheet in Copper Alloy},
author = {Thibaud, Sebastien and Touache, Abdelhamid and Chambert, Jerome and Picart, Philippe},
abstractNote = {Blanking process is widely used by electronic and micromechanical industries to produce small and thin components in large quantities. To take into consideration the influence of strain rate and temperature on precision blanking of thin sheet in copper alloy, a thermo-elasto-visco-plastic modelling has been developed. Furthermore the blanking of thin sheet in Cual copper presents dynamic recrystallization. A new modelling of dynamic recrystallization based on the thermodynamics of irreversible processes is proposed. Blanking simulations of Cual copper sheet are performed to analyze the softening effect induced by dynamic recrystallization.},
doi = {10.1063/1.2729595},
journal = {AIP Conference Proceedings},
number = 1,
volume = 907,
place = {United States},
year = {Sat Apr 07 00:00:00 EDT 2007},
month = {Sat Apr 07 00:00:00 EDT 2007}
}
  • Precision blanking process is widely used by electronic and micromechanical industries to produce small and thin components in large quantities. To take account of the influence of strain rate and temperature on precision blanking of thin sheet in copper alloys, we have proposed a thermo-elasto-visco-plastic modelling. In addition, dynamic recrystallization takes place in Cual copper alloy during the blanking process of thin sheet. A new modelling of dynamic recrystallization based on the thermodynamics of irreversible processes is presented. Blanking simulations of Cual copper sheet are carried out in order to analyze the softening effect induced by dynamic recrystallization.
  • Using torsional tests in the austenite phase, the dynamic recrystallization of a selection of low alloy and microalloyed steels was studied and Avrami`s equation was modelled. The model is based on the experimental determination of flow curves and their subsequent modelling, making it possible to calculate the recrystallized fraction (X{sub d}) as a function of all the variables which intervene in hot deformation: temperature, strain rate, austenite grain size and the chemical composition of the steel. The influence of the first three variables is quantified using the Zener-Hollomon parameter where the activation energy is expressed as a function of themore » content of each alloy. The start of dynamic recrystallization was determined by regression, finding a value of 0.95{epsilon}{sub p}. In testing conditions all the elements were found in solution in the austenite, except Ti which was found partially precipitated. The results of these tests indicate that C, Si (low content), Mn and V have hardly any influence on the start of recrystallization while Mo, Ti and especially Nb delay it. Finally, the dynamic recrystallization kinetics are illustrated through the study of the microstructure during deformation.« less
  • The microstructure and texture evolution of Mg{sub 98.5}Y{sub 1}Zn{sub 0.5} and Mg{sub 92.5}Y{sub 5}Zn{sub 2.5} (atomic percent) alloys during hot extrusion were systematically investigated. The coarse LPSO phases with higher volume fraction (∼ 57%) suppressed the twinning generation in the initial stage of extrusion, and accelerated the dynamic recrystallization through the particle deformation zones. Therefore, the volume fraction of DRXed grains in as-extruded Mg{sub 92.5}Y{sub 5}Zn{sub 2.5} alloy was much higher than that of Mg{sub 98.5}Y{sub 1}Zn{sub 0.5} alloy. The intensive recrystallization process resulted in the conventional basal texture weakening, although the texture evolution was mainly dominated by flow behavior.more » The dynamic recrystallization behavior in Mg{sub 92.5}Y{sub 5}Zn{sub 2.5} alloy restricted the formation of deformation texture, and thus the more random texture was observed during the whole extrusion process. - Highlights: • The densely coarse LPSO phases suppressed the twinning deformation. • Coarse LPSO phases induced the particle stimulated nucleation effect. • Dynamic recrystallization resulted in the basal texture weakening effect.« less
  • The texture variations associated with the occurrence of dynamic recrystallization (DRX) during the high temperature torsion of a Ti interstitial-free steel were examined. Both texture formation mechanisms of DRX were considered: i.e., oriented nucleation as well as selective growth. These processes were simulated with the aid of a self-consistent polycrystal model that takes crystallographic glide and DRX into account and also allows for the grain shape changes that take place during deformation. To handle the variations in volume fraction associated with the different orientations caused by DRX, the so-called volume transfer scheme was employed. By comparing the texture predictions withmore » the experimental observations, it is shown that the self-consistent model reproduces the DRX textures more faithfully than previous relaxed constraint models. The results also indicate that the main texture formation mechanism during DRX is oriented nucleation followed by generalized growth. By contrast, selective growth, as modelled in terms of coincident site lattice rotations or plane matching, appears to be of little importance under the present conditions.« less