Annealing twin development during recrystallization and grain growth in pure nickel

Jin, Yuan; Bo, Lin; Bernacki, Marc; Rohrer, Gregory S.; Rollett, Anthony D.; Bozzolo, Nathalie

doi:10.1016/j.msea.2014.01.018

Cited by 202 publications

(73 citation statements)

References 33 publications

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“…This suggests that the development of annealing twins slows down as the recrystallized grains coarsen. Similar results were obtained in other studies on the annealing twin development [38][39][40]. A rapid increase in twin density was observed during the recrystallization development [40], whereas subsequent grain growth was accompanied by an apparent decrease in the twin density [39].…”

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confidence: 89%

Σ3 CSL boundary distributions in an austenitic stainless steel subjected to multidirectional forging followed by annealing

Tikhonova

Kuzminova

Fang

et al. 2014

Philosophical Magazine

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The effect of processing and annealing temperatures on the grain boundary characters in the ultrafine-grained structure of a 304-type austenitic stainless steel was studied. An S304H steel was subjected to multidirectional forging (MDF) at 500-800°C to total strains of~4, followed by annealing at 800-1,000°C for 30 min. The MDF resulted in the formation of ultrafine-grained microstructures with mean grain sizes of 0.28-0.85 μm depending on the processing temperature. The annealing behaviour of the ultrafine-grained steel was characterized by the development of continuous post-dynamic recrystallization including a rapid recovery followed by a gradual grain growth. The post-dynamically recrystallized grain size depended on both the deformation temperature and the annealing temperature. The recrystallization kinetics was reduced with an increase in the temperature of the preceding deformation. The grain growth during post-dynamic recrystallization was accompanied by an increase in the fraction of Σ3 n CSL boundaries, which was defined by a relative change in the grain size, i.e. a ratio of the annealed grain size to that evolved by preceding warm working (D/D 0 ). The fraction of Σ3 n CSL boundaries sharply rose to approximately 0.5 in the range of D/D 0 from 1 to 5, which can be considered as early stage of continuous post-dynamic recrystallization. Then, the rate of increase in the fraction of Σ3 n CSL boundaries slowed down significantly in the range of D/D 0 > 5. A fivefold increase in the grain size by annealing is a necessary condition to obtain approximately 50% Σ3 n CSL boundaries in the recrystallized microstructure.

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supporting

confidence: 89%

Σ3 CSL boundary distributions in an austenitic stainless steel subjected to multidirectional forging followed by annealing

Tikhonova

Kuzminova

Fang

et al. 2014

Philosophical Magazine

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“…Twin formation has been reported by Jin et al [34] as being consistent with the growth accident model [35][36][37] and as occurring mainly along with the migration of a recrystallization front. It is worth mentioning that twin formation may also play a role in the Inconel 718 recrystallization nucleation process and/or in the growth of the recrystallized grains as it may help in forming mobile high misorientation angle boundaries [15].…”

Section: Post-dynamic Evolution Of Twin Boundariessupporting

confidence: 72%

“…It is worth mentioning that twin formation may also play a role in the Inconel 718 recrystallization nucleation process and/or in the growth of the recrystallized grains as it may help in forming mobile high misorientation angle boundaries [15]. On the contrary, twin boundary density decreases within the grain growth regime, as big grains consume small ones and their twins without producing new ones [34,38]. Indeed, only few twin formation events occur during capillarity-driven grain boundary motion.…”

Section: Post-dynamic Evolution Of Twin Boundariesmentioning

confidence: 99%

In Situ Characterization of Inconel 718 Post-Dynamic Recrystallization within a Scanning Electron Microscope

Zouari

Logé

Bozzolo

2017

Metals

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Microstructure evolution within the post-dynamic regime following hot deformation was investigated in Inconel 718 samples with different dynamically recrystallized volume fractions and under conditions such that no δ-phase particles were present. In situ annealing treatments carried out to mimic post-dynamic conditions inside the Scanning Electron Microscope (SEM) chamber suggest the occurrence of both metadynamic and static recrystallization mechanisms. Static recrystallization was observed in addition to metadynamic recrystallization, only when the initial dynamically recrystallized volume fraction was very small. The initial volume fraction of dynamically recrystallized grains appears to be decisive for subsequent microstructural evolution mechanisms and kinetics. In addition, the formation of annealing twins is observed along with the growth of recrystallized grains, but then the twin density decreases as the material enters the capillarity-driven grain growth regime.

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“…This initial microstructure results from the prior recrystallization process. It has been established that the twin density after recrystallization is mainly controlled by the stored energy level [13,14] and that the twin formation event occurs more often when the grains are growing faster [9,15]. The migration rate of the recrystallization front decreases during the recrystallization process because the remaining stored energy level in the deformed matrix is decreasing.…”

Section: Experimental Results and Discussion Of The Underlying Mechanmentioning

confidence: 99%

Evolution of the Annealing Twin Density during δ-Supersolvus Grain Growth in the Nickel-Based Superalloy Inconel™ 718

Jin

Bernacki

Agnoli

et al. 2015

Metals

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Abstract:Grain growth experiments were performed on Inconel™ 718 to investigate the possible correlation of the annealing twin density with grain size and with annealing temperature. Those experiments were conducted at different temperatures in the δ supersolvus domain and under such conditions that only capillarity forces were involved in the grain boundary migration process. In the investigated range, there is a strong inverse correlation of the twin density with the average grain size. On the other hand, the twin density at a given average grain size is not sensitive to annealing temperature. Consistent with previous results for pure nickel, the twin density evolution in Inconel™ 718 is likely to be mainly controlled by the propagation of the pre-existing twins of the growing grains; i.e., the largest ones of the initial microstructure. Almost no new twin boundaries are created during the grain growth process itself. Therefore, the twin density at a given average grain size is mainly dependent on the twin density in the largest grains of the initial microstructure and independent of the temperature at which grains grow. Based on the observations, a mean field model is proposed to predict annealing twin density as a function of grain size during grain growth.

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Annealing twin development during recrystallization and grain growth in pure nickel

Cited by 202 publications

References 33 publications

Σ3 CSL boundary distributions in an austenitic stainless steel subjected to multidirectional forging followed by annealing

Σ3 CSL boundary distributions in an austenitic stainless steel subjected to multidirectional forging followed by annealing

In Situ Characterization of Inconel 718 Post-Dynamic Recrystallization within a Scanning Electron Microscope

Evolution of the Annealing Twin Density during δ-Supersolvus Grain Growth in the Nickel-Based Superalloy Inconel™ 718

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