A Model for Static Recrystallization with Simultaneous Precipitation and Solute Drag

Buken, Heinrich; Kozeschnik, Ernst

doi:10.1007/s11661-016-3524-5

Cited by 59 publications

(29 citation statements)

References 36 publications

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“…This was associated with the higher stability of V-containing precipitates against coarsening, coagulation, or dissolution during high-temperature deformation as compared to Cr-based particles. The pinning effect of V (C, N) precipitates on the moving grain boundaries during recrystallization was noted in [34]. The authors showed that with increasing in V-carbonitride fraction, the plateau on the recrystallization fraction vs. recrystallization time started in earlier times and at higher testing temperatures [34].…”

Section: Resultsmentioning

confidence: 99%

“…The pinning effect of V (C, N) precipitates on the moving grain boundaries during recrystallization was noted in [34]. The authors showed that with increasing in V-carbonitride fraction, the plateau on the recrystallization fraction vs. recrystallization time started in earlier times and at higher testing temperatures [34]. The positive effect of stable disperse particles was also associated with the fact that they could act as recrystallization nuclei and promote grain refinement [1].…”

Section: Resultsmentioning

confidence: 99%

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On the Superplastic Deformation in Vanadium-Alloyed High-Nitrogen Steel

Астафурова¹,

Moskvina²,

Panchenko³

et al. 2019

Metals

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The experimental evidence for the realization of a superplastic behavior with 900% elongation in V-alloyed high-nitrogen austenitic Fe-19Cr-22Mn-1.5V-0.3C-0.6N steel was proposed. Using thermomechanical processing, a misoriented grain/subgrain austenitic microstructure with a high density of deformation-assisted defects and precipitates was developed in the steel. During high-temperature tensile deformation in a temperature interval from 850 to 1000 • C and strain-rate range from 4 × 10 −4 s −1 to 6 × 10 −3 s −1 , this microstructure demonstrated the characteristics of superplastic flow: elongation in the interval 400-900%, strain-rate sensitivity exponent m = 0.40-0.49, grain boundary sliding mechanism. The maximum elongation to failure (900%) was reached at deformation temperature 950 • C and strain rate 4 × 10 −4 s −1 .precipitation hardening [24][25][26][27]. Despite the visible advantages of the high-nitrogen austenitic steels as a construction material, there is limited data related to the possibility of realization of superplastic flow in them. Padmanabhan [1] mentioned a result of N. Narkevich, who reported 239% elongation in Fe-20Cr-20Mn-4.7V-1.14N (mass.%) steel tested at temperature 950 • C and strain-rate 4.6 × 10 −4 s −1 . Such relatively high elongation was obtained for the steel after a solid-solution treatment followed by 50% cold-rolling and age-hardening at 700 • C for 1 h. The microstructure of the steel during high-temperature tests, probably, was not strictly single-phase austenitic but also contained Cr-based and V-based nitrides. This result lied in line with those for single-phase austenitic stainless steels, in which the superplastic-assisted elongation does not exceed 280% [1,28]. Mineura [29] reported much higher elongation (527%) for Fe-20Cr-10Ni-0.7N (mass.%) steel at temperature 800 • C and strain rate 8 × 10 −4 s −1 . They used two-step cold rolling with intermediate anneal at 1000 • C for obtaining fine-grained austenitic structure stabilized by fine chromium nitrides. Vanadium-alloying promotes a homogeneous (continuous) reaction of precipitate hardening in austenitic CrMn steels [24], and this fact could provide higher stability of the fine-grained structure during high-temperature tests as compared to chromium nitrides. Therefore, there is a potential for improvement of the values for the superplastic elongation obtained by Mineura [29].This paper aimed to find out the superplastic characteristics in high-nitrogen V-alloyed austenitic steel Fe-19Cr-22Mn-1.5V-0.3C-0.6N (mass.%).

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

On the Superplastic Deformation in Vanadium-Alloyed High-Nitrogen Steel

Астафурова¹,

Moskvina²,

Panchenko³

et al. 2019

Metals

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“…The grain and subgrain boundary mobilities are most important input parameters determining the recrystallization kinetics. To model the HAGB mobility, the same approach is used, which has recently been successfully applied to recrystallization kinetics simulations in micro-alloyed steel [13] with…”

Section: Boundary Mobilitymentioning

confidence: 99%

“…The concentration of Mg, C GB , is assumed to be identical to the matrix concentration. [11,13,29] If the Mg content in the alloy increases, the grain boundary mobility decreases due to the increasing amount of atoms that must be dragged along with the moving boundary. In the limit of zero Mg, the calculated integral mobility approximates the free mobility since the solute drag mobility approaches infinity.…”

Section: Boundary Mobilitymentioning

confidence: 99%

Modeling Static Recrystallization in Al-Mg Alloys

Buken

Kozeschnik

2020

Metall Mater Trans A

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In the present work, the influence of Mg on recrystallization kinetics in Al is analyzed by computer simulation. A comprehensive state parameter-based microstructure model is developed, which describes recrystallization in terms of nucleation and growth. The mechanism of solute drag is fully incorporated, thus accounting for the decrease of grain boundary mobility in the presence of impurity atoms. On the basis of the present approach, the solute binding energy between Mg atoms and grain boundaries is assessed and compared to experimentally measured values. Furthermore, the influence of Mg on dislocation production during strain hardening is modeled. The simulations of the composition and temperature-dependent recrystallization kinetics are verified on experimental studies where excellent agreement is achieved. Both simulation and experiment show that increasing Mg content first decelerates and, later on, accelerates recrystallization kinetics.

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“…It should be noted that M 0 in Eq. [5] corresponds to an effective interface mobility, which accounts for the lattice reconstruction, solute drag effect due to substitutional alloying elements, [32] pinning effects of precipitates at the grain boundary, [33] and the direction of the transformation. [34] The local driving force DG depends on the solute concentrations at the interface.…”

Section: Ferrite Growthmentioning

confidence: 99%

Analysis of the Grain Size Evolution for Ferrite Formation in Fe-C-Mn Steels Using a 3D Model Under a Mixed-Mode Interface Condition

Fang

Mecozzi

Brück

et al. 2017

Metall Mater Trans A

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A 3D model has been developed to predict the average ferrite grain size and grain size distribution for an austenite-to-ferrite phase transformation during continuous cooling of an Fe-C-Mn steel. Using a Voronoi construction to represent the austenite grains, the ferrite is assumed to nucleate at the grain corners and to grow as spheres. Classical nucleation theory is used to estimate the density of ferrite nuclei. By assuming a negligible partition of manganese, the moving ferrite-austenite interface is treated with a mixed-mode model in which the soft impingement of the carbon diffusion fields is considered. The ferrite volume fraction, the average ferrite grain size, and the ferrite grain size distribution are derived as a function of temperature. The results of the present model are compared with those of a published phase-field model simulating the ferritic microstructure evolution during linear cooling of an Fe-0.10C-0.49Mn (wt pct) steel. It turns out that the present model can adequately reproduce the phase-field modeling results as well as the experimental dilatometry data. The model presented here provides a versatile tool to analyze the evolution of the ferrite grain size distribution at low computational costs.

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A Model for Static Recrystallization with Simultaneous Precipitation and Solute Drag

Cited by 59 publications

References 36 publications

On the Superplastic Deformation in Vanadium-Alloyed High-Nitrogen Steel

On the Superplastic Deformation in Vanadium-Alloyed High-Nitrogen Steel

Modeling Static Recrystallization in Al-Mg Alloys

Analysis of the Grain Size Evolution for Ferrite Formation in Fe-C-Mn Steels Using a 3D Model Under a Mixed-Mode Interface Condition

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