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Knut Marthinsen - One of the best experts on this subject based on the ideXlab platform.
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microstructural evolution during isothermal annealing of a cold rolled al mn fe si alloy with different microchemistry states
Materials Science Forum, 2014Co-Authors: Ke Huang, Yanjun Li, Knut MarthinsenAbstract:In this paper, investigation of the Softening Behaviour of a supersaturated Al-Mn-Fe-Si alloy during annealing after cold rolling has been carried out. Two different homogenization conditions were considered, of which one gives a condition of a large amount of small pre-existing dispersoids, i.e. providing a significant static Zener drag, while the other gives a condition where both concurrent precipitation and dispersoid drag effects are limited. The homogenized samples with different microchemistry states were then cold-rolled to different strains before subsequent annealing at 300 degrees C. The Softening and concurrent precipitation Behaviours have been monitored by hardness and electrical conductivity measurements respectively, and the microstructural evolution has been characterized by EBSD. It is clearly demonstrated that the actual microchemistry state, i.e. amount of solutes and second-phase particle structures as determined by the homogenization procedure strongly influence the Softening Behaviour where a fine dispersion of pre-existing dispersoids together with concurrent precipitation slow down the recrystallization kinetics considerably and give a very coarse and elongated grain structure.
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the influence of microchemistry on the Softening Behaviour of two cold rolled al mn fe si alloys
Materials Science and Engineering A-structural Materials Properties Microstructure and Processing, 2014Co-Authors: Ke Huang, Ning Wang, Knut MarthinsenAbstract:Abstract The influence of microchemistry on the Softening Behaviour of two cold-rolled Al–Mn–Fe–Si alloys with different initial amounts of Mn (0.4 and 1.0 wt%) is studied. In addition to their as-cast conditions, the supersaturated Al–Mn–Fe-Si alloys were appropriately homogenized at two different conditions, which together produce three different states of microchemistry for each alloy, i.e. solutes and second-phase particles. Samples with different microchemistry states were then cold-rolled before subsequent back-annealing at different temperatures for the two alloys. The Softening and concurrent precipitation Behaviours of the samples have been monitored by hardness and electrical conductivity measurements ,respectively, and the final microstructure in terms of grain structure and texture has been characterized by EBSD. It is clearly demonstrated that the amount of Mn and the actual microchemistry state as determined by the homogenization procedure strongly influence the Softening Behaviour. Both a fine dispersion of pre-existing dispersoids and strong concurrent precipitation may slow down the recrystallization kinetics considerably and give a very coarse grain structure and textures commonly associated with dispersoids effects, although some are slightly atypical.
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modelling the Softening Behaviour of commercial almn alloys
Materials Science Forum, 2004Co-Authors: Knut Sjolstad, Knut Marthinsen, Erik NesAbstract:In the present work a detailed characterisation of a cold rolled and annealed AA3103- alloy has been carried out. The effect of different concentrations of Mn in supersaturated solid solution on the deformation and subsequent annealing Behaviour has been studied in detail. A physically based microstructure model has been used to predict the evolution in microstructure and flow stress during annealing of the given alloy, with particular focus on the effect of concurrent precipitation on the Softening Behaviour.
Ke Huang - One of the best experts on this subject based on the ideXlab platform.
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microstructural evolution during isothermal annealing of a cold rolled al mn fe si alloy with different microchemistry states
Materials Science Forum, 2014Co-Authors: Ke Huang, Yanjun Li, Knut MarthinsenAbstract:In this paper, investigation of the Softening Behaviour of a supersaturated Al-Mn-Fe-Si alloy during annealing after cold rolling has been carried out. Two different homogenization conditions were considered, of which one gives a condition of a large amount of small pre-existing dispersoids, i.e. providing a significant static Zener drag, while the other gives a condition where both concurrent precipitation and dispersoid drag effects are limited. The homogenized samples with different microchemistry states were then cold-rolled to different strains before subsequent annealing at 300 degrees C. The Softening and concurrent precipitation Behaviours have been monitored by hardness and electrical conductivity measurements respectively, and the microstructural evolution has been characterized by EBSD. It is clearly demonstrated that the actual microchemistry state, i.e. amount of solutes and second-phase particle structures as determined by the homogenization procedure strongly influence the Softening Behaviour where a fine dispersion of pre-existing dispersoids together with concurrent precipitation slow down the recrystallization kinetics considerably and give a very coarse and elongated grain structure.
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the influence of microchemistry on the Softening Behaviour of two cold rolled al mn fe si alloys
Materials Science and Engineering A-structural Materials Properties Microstructure and Processing, 2014Co-Authors: Ke Huang, Ning Wang, Knut MarthinsenAbstract:Abstract The influence of microchemistry on the Softening Behaviour of two cold-rolled Al–Mn–Fe–Si alloys with different initial amounts of Mn (0.4 and 1.0 wt%) is studied. In addition to their as-cast conditions, the supersaturated Al–Mn–Fe-Si alloys were appropriately homogenized at two different conditions, which together produce three different states of microchemistry for each alloy, i.e. solutes and second-phase particles. Samples with different microchemistry states were then cold-rolled before subsequent back-annealing at different temperatures for the two alloys. The Softening and concurrent precipitation Behaviours of the samples have been monitored by hardness and electrical conductivity measurements ,respectively, and the final microstructure in terms of grain structure and texture has been characterized by EBSD. It is clearly demonstrated that the amount of Mn and the actual microchemistry state as determined by the homogenization procedure strongly influence the Softening Behaviour. Both a fine dispersion of pre-existing dispersoids and strong concurrent precipitation may slow down the recrystallization kinetics considerably and give a very coarse grain structure and textures commonly associated with dispersoids effects, although some are slightly atypical.
E Smith - One of the best experts on this subject based on the ideXlab platform.
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the elastically equivalent Softening zone size for an elastic Softening material i power law Softening Behaviour
Mechanics of Materials, 1994Co-Authors: E SmithAbstract:Abstract The paper is concerned with the determination of the elastically equivalent Softening zone size (RE) associated with a semi-infinite crack in a remotely loaded infinite solid, with the material being of the elastic-Softening variety. RE plays a prominent role in size effect expressions that are used to correlate the failure loads for solids having different dimensions. RE is determined for a range of Softening Behaviours, characterised by a power law variation, and a comparison is made with the value RA: the actual Softening zone size. The ratio R E /R A increases from a value 0.333 for the case where the stress is constant with the zone, to a value of unity for the other limiting case where G F /P c δ c →0;G F is the specific fracture energy, while pc and δc, are respectively the maximum stress and displacement within the Softening zone.
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The elastically equivalent Softening zone size for an elastic-Softening material: I. Power law Softening Behaviour
Mechanics of Materials, 1994Co-Authors: E SmithAbstract:Abstract The paper is concerned with the determination of the elastically equivalent Softening zone size (RE) associated with a semi-infinite crack in a remotely loaded infinite solid, with the material being of the elastic-Softening variety. RE plays a prominent role in size effect expressions that are used to correlate the failure loads for solids having different dimensions. RE is determined for a range of Softening Behaviours, characterised by a power law variation, and a comparison is made with the value RA: the actual Softening zone size. The ratio R E /R A increases from a value 0.333 for the case where the stress is constant with the zone, to a value of unity for the other limiting case where G F /P c δ c →0;G F is the specific fracture energy, while pc and δc, are respectively the maximum stress and displacement within the Softening zone.
Ning Wang - One of the best experts on this subject based on the ideXlab platform.
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the influence of microchemistry on the Softening Behaviour of two cold rolled al mn fe si alloys
Materials Science and Engineering A-structural Materials Properties Microstructure and Processing, 2014Co-Authors: Ke Huang, Ning Wang, Knut MarthinsenAbstract:Abstract The influence of microchemistry on the Softening Behaviour of two cold-rolled Al–Mn–Fe–Si alloys with different initial amounts of Mn (0.4 and 1.0 wt%) is studied. In addition to their as-cast conditions, the supersaturated Al–Mn–Fe-Si alloys were appropriately homogenized at two different conditions, which together produce three different states of microchemistry for each alloy, i.e. solutes and second-phase particles. Samples with different microchemistry states were then cold-rolled before subsequent back-annealing at different temperatures for the two alloys. The Softening and concurrent precipitation Behaviours of the samples have been monitored by hardness and electrical conductivity measurements ,respectively, and the final microstructure in terms of grain structure and texture has been characterized by EBSD. It is clearly demonstrated that the amount of Mn and the actual microchemistry state as determined by the homogenization procedure strongly influence the Softening Behaviour. Both a fine dispersion of pre-existing dispersoids and strong concurrent precipitation may slow down the recrystallization kinetics considerably and give a very coarse grain structure and textures commonly associated with dispersoids effects, although some are slightly atypical.
E Aernoudt - One of the best experts on this subject based on the ideXlab platform.
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work hardening Softening Behaviour of b c c polycrystals during changing strain paths ii tem observations of dislocation sheets in an if steel during two stage strain paths and their representation in terms of dislocation densities
Acta Materialia, 2001Co-Authors: Bart Peeters, B Bacroix, Cristian Teodosiu, P Van Houtte, E AernoudtAbstract:Abstract The relationship between the developed intragranular microstructure and the deformation history of a grain in a low-carbon IF steel is comprehensively investigated during monotonic deformation and two-stage strain paths. TEM micrographs show that dislocation sheets are currently generated parallel to the active slip planes. In the extended Taylor model developed in Part 1 of this paper, such substructural features are modelled and updated dynamically for each strain increment. The actual structure bears some memory of the deformation history. This paper shows the capability of the extended Taylor model to reproduce several features of the substructural developments observed in transmission electron micrographs after monotonic deformation and two-stage strain paths. The evolution of the mesostructural features in stable and unstable crystals are discussed in the context of the work-hardening/Softening Behaviour of the IF steel. It is demonstrated that the model can be used to predict qualitatively the intensity and the polarity of the dislocation sheets in a grain during any deformation path.
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work hardening Softening Behaviour of b c c polycrystals during changing strain part ii tem observations of dislocation sheets in an if steel during two stage strain paths and their representation in terms of dislocation densities
Acta Materialia, 2001Co-Authors: Bart Peeters, B Bacroix, Cristian Teodosiu, P Van Houtte, E AernoudtAbstract:Abstract The relationship between the developed intragranular microstructure and the deformation history of a grain in a low-carbon IF steel is comprehensively investigated during monotonic deformation and two-stage strain paths. TEM micrographs show that dislocation sheets are currently generated parallel to the active slip planes. In the extended Taylor model developed in Part 1 of this paper, such substructural features are modelled and updated dynamically for each strain increment. The actual structure bears some memory of the deformation history. This paper shows the capability of the extended Taylor model to reproduce several features of the substructural developments observed in transmission electron micrographs after monotonic deformation and two-stage strain paths. The evolution of the mesostructural features in stable and unstable crystals are discussed in the context of the work-hardening/Softening Behaviour of the IF steel. It is demonstrated that the model can be used to predict qualitatively the intensity and the polarity of the dislocation sheets in a grain during any deformation path.
