Factors affecting dynamic recrystallization of metals and alloys

Ueki, Masaaki; Horie, Shiro; Nakamura, Tadahisa

doi:10.1179/026708387790122585

Cited by 33 publications

(23 citation statements)

References 9 publications

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“…Andrade et al 37) observed dynamically recrystallized grains as small as 100 nm in Cu at a strain rate of 10 4 s À1 and a total shear strain of $ 8. Even though their grain size is one order of magnitude smaller than the grain size reported in literature, [38][39][40][41][42][43] the result seems to be consistent with the trend extrapolated from the empirical equation of Blaz et al, 44) Fig. 14,…”

Section: Evolution Towards Nanostructures Upon Prolongedsupporting

confidence: 87%

Dynamic Processes for Nanostructure Development in Cu after Severe Cryogenic Rolling Deformation

Wang

Jiao

2003

Mater. Trans.

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The dynamic grain refinement behavior upon severe plastic deformation has been systematically studied in commercial purity copper that was heavily cold rolled to large deformations at cryogenic temperatures. The low-temperature rolling allows the accumulation of extraordinarily high densities of dislocations in Cu, enabling an investigation of the various dynamic recrystallization phenomena upon further deformation. The eventual steady-state grain sizes achieved, as well as the dynamic recrystallization mechanisms, are studied using controlled deformation tests combined with transmission electron microscopy. The dominant mechanisms observed to contribute to grain refinement in Cu include the classical migration dynamic recrystallization process, the deformation twinning, as well as the continuous dynamic recrystallization via progressive lattice rotation upon deformation to extremely large strains. The strain rate and deformation temperature have strong effects on the operative mechanisms and the grain sizes achieved in the ultrafine and nanocrystalline regimes.

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Section: Evolution Towards Nanostructures Upon Prolongedsupporting

confidence: 87%

Dynamic Processes for Nanostructure Development in Cu after Severe Cryogenic Rolling Deformation

Wang

Jiao

2003

Mater. Trans.

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“…However, at high stored energy, DRX begins by the growth of the high angle cell boundaries formed by dislocation accumulation. [34][35][36] The difference in dislocation density in front of and behind the boundary is the driving force for the growth of the DRX nuclei. 29,30,36) In single peak DRX, such as the case of Figs.…”

Section: Hot Working Behaviormentioning

confidence: 99%

Hot Deformation and Dynamic Recrystallization of 17-4 PH Stainless Steel

Mirzadeh

Najafizadeh

2013

ISIJ Int.

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The hot deformation behavior of a 17-4 PH stainless steel was investigated by compression tests. The typical single-peak dynamic recrystalization (DRX) behavior and also a transition state between single and multiple peak (cyclic) behaviors were seen in the resultant flow curves. The application of constitutive equations for determination of hot working constants was critically discussed. As a result, the deformation activation energy and the stress multiplier in the hyperbolic sine equation were determined as 337 kJ/mol and 0.011, respectively. The Zener-Hollomon parameter (Z) exponents for peak stress and peak strain based on the power relationships were determined as 0.18 and 0.11, respectively. The normalized critical stress and strain for initiation of DRX were respectively found to be 0.89 and 0.47. The prior austenite grain boundaries (PAGB) were revealed by electrolytic etching of the martensite in order to study the microstructure of hot deformed samples. Significant grain refinement occurred as a result of necklace DRX mechanism. The average dynamically recrystallized grain size was related to Z and peak stress by power equations with exponents of -0.25 and -1.24, respectively. A DRX map was developed to show the effect of deformation conditions on the occurrence of DRX and on the final grain size.

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“…[6][7][8][9][10] Although this structure is observed during hot deformation of many materials and under different deformation conditions, [11,12] there are still many issues regarding the progress of the DRX microstructure based on this phenomenon and especially the contribution from other DRX mechanisms, such as grain boundary sliding and continuous DRX.…”

Section: Introductionmentioning

confidence: 99%

Hot Deformation and Recrystallization of Austenitic Stainless Steel: Part I. Dynamic Recrystallization

Dehghan-Manshadi

Barnett

Hodgson

2008

Metall Mater Trans A

219

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The hot deformation behavior of a 304 austenitic stainless steel was investigated to characterize the evolution of the dynamically recrystallized structure as a starting point for studies of the postdeformation recrystallization behavior. The effect of different deformation parameters such as strain, strain rate, and temperature were investigated. The flow curves showed typical signs of dynamic recrystallization (DRX) over a wide range of temperatures and strain rates (i.e., different Zener-Hollomon (Z) values). However, under very high or very low Z values, the flow curves' shapes changed toward those of the dynamic recovery and multiple peaks, respectively. The results showed that while DRX starts at a strain as low as 60 pct of the peak strain, a fully DRX microstructure needs a high strain of almost 4.5 times the initiation strain. The DRX average grain size showed power-law functions with both the Zener-Hollomon parameter and the peak stress, although power-law breakdown was observed at high Z values.

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Factors affecting dynamic recrystallization of metals and alloys

Cited by 33 publications

References 9 publications

Dynamic Processes for Nanostructure Development in Cu after Severe Cryogenic Rolling Deformation

Dynamic Processes for Nanostructure Development in Cu after Severe Cryogenic Rolling Deformation

Hot Deformation and Dynamic Recrystallization of 17-4 PH Stainless Steel

Hot Deformation and Recrystallization of Austenitic Stainless Steel: Part I. Dynamic Recrystallization

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