A state parameter-based model for static recrystallization interacting with precipitation

Buken, Heinrich; Sherstnev, Pavel; Kozeschnik, Ernst

doi:10.1088/0965-0393/24/3/035006

Cited by 20 publications

(9 citation statements)

References 35 publications

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“…Based on the comprehensive thermokinetic simulation environment provided by MatCalc, precipitation kinetics at different temperatures, deformation conditions and alloy compositions were calculated in an almost parameter-free manner by Buken and Kozeschnik [250,388]. These authors introduced the concept of local precipitates coarsening at grain boundaries, which was experimentally observed in some microalloyed steels [e.g.…”

Section: Recrystallization With Concurrent Precipitationmentioning

confidence: 99%

The double-edge effect of second-phase particles on the recrystallization behaviour and associated mechanical properties of metallic materials

Huang

Marthinsen

Zhao

et al. 2018

Progress in Materials Science

542

113

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Most industrial alloys contain a matrix phase and dispersed second-phase particles. Several thermomechanical processing (TMP) steps are usually needed to produce a final product, during which recrystallization and its related phenomena may take place. Second-phase particles may retard or accelerate recrystallization, depending on their size and spatial distribution, the TMP conditions, among others. Besides their effect on recrystallization kinetics, the introduction of second-phase particles creates additional interfaces within the matrix, it also modifies the grain structure and crystallographic texture after recrystallization, which then either improves or deteriorates the associated mechanical properties of the investigated materials. The interactions between second-phase particles and recrystallization are further complicated when these particles are not stable. In addition to particle coarsening, they can also precipitate out or dissolve into the matrix before, simultaneously with or after recrystallization. This review article attempts to summarize the recent progresses on the complex interaction between second-phase particles and recrystallization and the science behind them. This double-edge effect of second-phase particles on recrystallization behaviour and mechanical properties of metallic materials is still far from being clear. A better understanding of this issue is of high academic and industrial interests, since it provides potential freedom for TMP design and microstructure control.

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Section: Recrystallization With Concurrent Precipitationmentioning

confidence: 99%

The double-edge effect of second-phase particles on the recrystallization behaviour and associated mechanical properties of metallic materials

Huang

Marthinsen

Zhao

et al. 2018

Progress in Materials Science

542

113

View full text Add to dashboard Cite

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“…Table II. In a recent contribution, [25] the basic functionality of the elaborated model has been demonstrated with similar input parameters. Both, the nucleation and growth behavior, showed reasonable agreement with experiment.…”

Section: Model Parametersmentioning

confidence: 99%

A Model for Static Recrystallization with Simultaneous Precipitation and Solute Drag

Buken

Kozeschnik

2016

Metall Mater Trans A

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In the present work, we introduce a state parameter-based microstructure evolution model, which incorporates the effect of solute atoms and precipitates on recrystallization kinetics. The model accounts for local precipitate coarsening at grain boundaries, which promotes an average grain boundary movement even if the Zener pinning force exceeds the driving force for recrystallization. The impact of solute drag on the grain boundary mobility as well as simultaneous precipitation is discussed in detail. The model is validated on experimental data on recrystallization in V-micro-alloyed steel, where excellent agreement is achieved.

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“…[30,39] The dislocation evolution in the material was approximated using a Kocks-Mecking-type approach to describe dislocation generation and annihilation, with rate equations describing dislocation generation, as well as dynamic and static recovery. [28,[40][41][42][43] The principle of similitude is applied to describe the subgrain evolution. [28,43] The grain size was described using the MatCalc multi-class model, with the grain size development described in References 44.…”

Section: Microstructural Characterizationmentioning

confidence: 99%

Investigation and Simulation of the Effects of nm-Scale γ′ Precipitates on the Recrystallization of Ni-based Superalloys

Buerstmayr

Theska

Kozeschnik

et al. 2023

Metall Mater Trans A

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Superalloys are critical materials for the hottest sections of stationary gas turbines and aircraft engines. Homogeneously fine-grained microstructures are essential to unlock their superior high-temperature strength but are challenging to achieve in γ′-containing Ni-based superalloys. Such microstructures are achieved by recrystallization through hot working and grain boundary pinning viaμm-scale second phase particles. Discontinuous dynamic recrystallization is the predominant restoration mechanism, where grain growth is restricted by Zener pinning. Nanometer-scale γ′ precipitates may exercise similar pinning during the nucleation stage and thus delay recrystallization. While the effects of coarse, μm-scale, precipitates during recrystallization and grain growth are well-known, descriptions for fine coherent precipitates are currently lacking. To address this scarcity of knowledge, both γ′-rich and -lean microstructures of the γ′-containing Ni-base superalloy René 41 underwent identical uniaxial hot compression tests. Flow stress and microstructural analyses reveal the inhibition of recrystallization by nm-scale γ′ precipitates during both nucleation and growth stages. This effect is successfully described using thermo-kinetic modeling through application of a driving-force based model. These unique insights provide a novel pathway to unlock homogeneously fine-grained microstructures in γ′-containing Ni-based superalloys via advanced thermo-mechanical processing routes, required for applications in future generations of gas turbines and aircraft engines.

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A state parameter-based model for static recrystallization interacting with precipitation

Cited by 20 publications

References 35 publications

The double-edge effect of second-phase particles on the recrystallization behaviour and associated mechanical properties of metallic materials

The double-edge effect of second-phase particles on the recrystallization behaviour and associated mechanical properties of metallic materials

A Model for Static Recrystallization with Simultaneous Precipitation and Solute Drag

Investigation and Simulation of the Effects of nm-Scale γ′ Precipitates on the Recrystallization of Ni-based Superalloys

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