On the kinetics of recrystallisation in cold worked metals

Hutchinson, Bevis; Jönsson, Stefan; Ryde, Lena

doi:10.1016/0036-9748(89)90510-3

Cited by 81 publications

(50 citation statements)

References 6 publications

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“…This behavior was attributed to the inhomogeneity of the stored energy distribution. 19) In dispersion-containing alloys, there are at least two factors, acting in opposition, that influence the growth speed of the recrystallized regions. At one side, there is the stored energy due to the elastic energy of stored dislocations, driving force for primary recrystallization, to which the growth rate is directly proportional.…”

Section: Recrystallization Kineticsmentioning

confidence: 99%

Cold Swaging, Recovery and Recrystallization of Oligocrystalline INCOLOY MA 956-Part II: Annealed State

Hupalo

Padilha

Sandim³

et al. 2004

ISIJ International

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The combination of a coarse-grained structure (oligocrystalline material), a strong initial texture, and the presence of fine particles make ODS superalloys like INCOLOY MA 956 very interesting materials for recrystallization studies. In the present paper, we have investigated the annealing behavior of the MA 956 alloy deformed by cold swaging to reductions of 20, 47, 61, and 72 % followed by annealing at temperatures ranging from 600 to 1 450°C. Light optical, scanning, and transmission electron microscopy were used to follow the microstructural changes upon annealing. Orientations of individual grains as well as microtexture were determined by electron backscatter diffraction (EBSD). Recrystallization texture was determined by Xray diffraction (XRD). The isothermal softening kinetics curves were determined for all samples. Discontinuous recrystallization and extended recovery are responsible for the softening of this alloy. The Johnson-Mehl-Avrami-Kolmogorov (JMAK) model was used to test our experimental data. The Avrami exponents (0.26ՅnՅ0.48) showed substantially smaller values than those predicted theoretically. This can be attributed to concurrent recovery and to a non-random distribution of recrystallization nuclei.

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Section: Recrystallization Kineticsmentioning

confidence: 99%

Cold Swaging, Recovery and Recrystallization of Oligocrystalline INCOLOY MA 956-Part II: Annealed State

Hupalo

Padilha

Sandim³

et al. 2004

ISIJ International

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“…4,5) In order to better understand recrystallization it is necessary to study the phenomenon of grain boundary kinetics on the local (micrometer) scale.…”

Section: Introductionmentioning

confidence: 99%

Direct Observation of Grain Boundary Migration during Recrystallization within the Bulk of a Moderately Deformed Aluminium Single Crystal

et al. 2014

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A single grain growing in the bulk of a mildly deformed (30% thickness reduction through cold rolling) aluminium single crystal with an f001gh100i orientation (Cube orientation), is monitored during recrystallization with synchrotron radiation using topo-tomography. The formation and migration of planar boundary segments (facets) are analyzed using a method that determines the displacements of local boundary segments along parallel lines perpendicular to the facet plane. Facets are observed to form after a certain annealing time. They migrate at a constant rate for extended periods of time and remain planar during their migration. A change in the migration rate for one facet has been observed which is not related to changes in the experimental conditions and is most likely to be driven by the changes in grain orientation and/or the local deformation microstructure. The crystallography of the analyzed facets is not closely related to any crystallographic {111} plane of neither the growing grain nor the disappearing deformed matrix.

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“…Static recrystallization is signi cantly stimulated with decreasing grain size 14) . Furthermore, temperature to onset static recrystallization is drastically lowered by UFG evolution by MDFing 15) .…”

Section: Mdfing Behavior and The Evolved Microstructurementioning

confidence: 99%

Effects of Strain Rate during Multi-Directional Forging on Grain Refinement and Mechanical Properties of AZ80Mg Alloy

2016

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Samples of AZ80Mg alloy were multi-directionally forged (MDFed) at various strain rates in the rage from 3.0 × 10 −3 s −1 to 3.0 × 10under decreasing temperature conditions. The MDFing pass temperatures employed were 653 K, 605 K and 553 K. These passes, each of 0.5 strain, were applied up to a cumulative strain of ΣΔε = 1.5 at maximum. The average grain size decreased with increasing cumulative strain and depended only weakly on the strain rate. Microstructures with average grain sizes of 0.84 μm, 0.88 μm and 1.2 μm were attained when MDFed at strain rates of 3.0 × 10 −1 s −1 , 3.0 × 10 −2 s −1 and 3.0 × 10 −3 s −1. The microstructure evolved at 3.0 × 10 −1 s −1 was less homogeneous. This difference is interpreted as being due to the higher stored energy causing static recrystallization in the latter MDFing condition. As a result, the best balance of the mechanical properties was attained by MDFing at 3.0 × 10 −2 s −1. In this case, ultimate tensile strength (UTS) of 445 MPa was achieved together with a fracture strain of 22%. By comparison, MDFing at 3.0 × 10 −1 s −1 led to lower UTS and ductility of 410 MPa and 15% while the yield stresses were comparable.

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On the kinetics of recrystallisation in cold worked metals

Cited by 81 publications

References 6 publications

Cold Swaging, Recovery and Recrystallization of Oligocrystalline INCOLOY MA 956-Part II: Annealed State

Cold Swaging, Recovery and Recrystallization of Oligocrystalline INCOLOY MA 956-Part II: Annealed State

Direct Observation of Grain Boundary Migration during Recrystallization within the Bulk of a Moderately Deformed Aluminium Single Crystal

Effects of Strain Rate during Multi-Directional Forging on Grain Refinement and Mechanical Properties of AZ80Mg Alloy

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