Particle stimulated nucleation during dynamic and metadynamic recrystallisation of Ni-30%Fe-Nb-C alloy

Pereloma, Elena V.; Mannan, Parvez; Casillas, Gilberto; Saleh, Ahmed A.

doi:10.1016/j.matchar.2017.01.026

Cited by 30 publications

(8 citation statements)

References 13 publications

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“…Besides PSN during SRX, this nucleation mechanism is also found in DRX and MDRX experiments [291,295,296,297]. However, it was concluded that PSN will not be as effective during DRX and/or MDRX than during SRX due to the fact that dislocations may bypass particles without forming a deformation zone [298], or due to the development of a dislocation structure within the newly formed grains as a result of the concurrent deformation [299], or to the activation of other nucleation mechanisms such as nucleation at original grain boundaries [300].…”

Section: Mechanism Of Particle Stimulated Nucleation (Psn)supporting

confidence: 54%

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

498

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: Mechanism Of Particle Stimulated Nucleation (Psn)supporting

confidence: 54%

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

498

113

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“…For Ni-base superalloys PSN was reported to occur at carbides during hot working of extremely coarse grained Waspaloy [46], presumably due to limited nucleation possibilities at sparsely distributed grain boundaries. Limited PSN at carbides was also observed in a Ni-30%Fe-Nb-C alloy deformed at 1075 • C [47]. Nucleation of new grains during PSN is facilitated by the dislocation substructure associated with the sharp orientation gradients developed around large (≥2 µm) nondeformable particles [48,49].…”

Section: Particle-stimulated Nucleationmentioning

confidence: 84%

Dynamic and Post-Dynamic Recrystallization of Haynes 282 below the Secondary Carbide Solvus

Eriksson

Colliander

2021

Metals

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Thermomechanical processes, such as forging, are important steps during manufacturing of superalloy components. The microstructural development during processing, which controls the final component properties, is complex and depends on e.g., applied strain, strain rate and temperature. In this study, we investigate the effect of process parameters on the dynamic and post-dynamic recrystallization during hot compression of Ni-base superalloy Haynes 282. Specifically, we address the effect of deformation below the grain boundary carbide solvus temperature. During deformation, discontinuous and continuous dynamic recrystallization was observed at the grain boundaries, and particle-stimulated nucleation occurred at primary carbides. Strain rate was determined to be the governing factor controlling the recrystallization fraction for strain rates up to 0.5 s−1 above which adiabatic heating became the dominating factor. Careful examination of the temperature development during deformation showed that the response of the closed-loop temperature control system to adiabatic heating can have important effects on the interpretation of the observed behavior. During a 90 s post-deformation hold, grain growth and an increasing fraction of twin boundaries significantly changed the deformation-induced microstructure and texture. The microstructure developed during post-dynamic recrystallization was mainly controlled by the temperature and only weakly coupled to the prior deformation step.

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“…In Figure 7 d, the grain size of β-Li matrix is much bigger due to higher mobility of grain boundaries at 300 °C. Generally, owing to the physical properties differences of the β-Li matrix, α-Mg phases and the secondary particles, the dislocation piled up in the vicinity of hard phases and secondary particles, the complex dislocation arranging and storing energy increased in the local area, and the driving force for recrystallization increased, which can accelerate the recrystallization and increase the fraction of DRX via particle stimulated nucleation [ 22 , 23 ]. Thus, the fraction of DRX of this alloy increased sharply and reached the complete DRX during a short strain in crescent due to a mounting of α-Mg, Al 4 Sr and Al 2 Y phases.…”

Section: Resultsmentioning

confidence: 99%

Dynamic Recrystallization Behavior and Corrosion Resistance of a Dual-Phase Mg-Li Alloy

et al. 2018

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The hot deformation and dynamic recrystallization behavior of the dual-phase Mg-9Li-3Al-2Sr-2Y alloy had been investigated using a compression test. The typical dual-phase structure was observed, and average of grain size of as-homogenized alloy is about 110 µm. It mainly contains β-Li, α-Mg, Al4Sr and Al2Y phases. The dynamic recrystallization (DRX) kinetic was established based on an Avrami type equation. The onset of the DRX process occurred before the peak of the stress–strain flow curves. It shows that the DRX volume fraction increases with increasing deformation temperature or decreasing strain rate. The microstructure evolution during the hot compression at various temperatures and strain rates had been investigated. The DRX grain size became larger with the increasing testing temperature or decreasing strain rate because the higher temperature or lower strain rate can improve the migration of DRX grain boundaries. The fully recrystallized microstructure can be achieved in a small strain due to the dispersed island-shape α-Mg phases, continuous the Al4Sr phases and spheroidal Al2Y particles, which can accelerate the nucleation. The continuous Al4Sr phases along the grain boundaries are very helpful for enhancing the corrosion resistance of the duplex structured Mg-Li alloy, which can prevent the pitting corrosion and filiform corrosion.

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Particle stimulated nucleation during dynamic and metadynamic recrystallisation of Ni-30%Fe-Nb-C alloy

Cited by 30 publications

References 13 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

Dynamic and Post-Dynamic Recrystallization of Haynes 282 below the Secondary Carbide Solvus

Dynamic Recrystallization Behavior and Corrosion Resistance of a Dual-Phase Mg-Li Alloy

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