Strain-Induced Selective Growth in 1.5% Temper-Rolled Fe∼1%Si

Bennett, Tricia A.; Kalu, Peter N.; Rollett, Anthony D.

doi:10.1017/s1431927611000377

Cited by 30 publications

(5 citation statements)

References 27 publications

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“…It could therefore also be described properly as a secondary recrystallization process. Similar phenomena have been reported in other materials as well, and referred to as "strain-induced selective grain growth" [7]. The reason for this is strain induced grain boundary migration across secondary phase particles, which occurs in low strain microstructures.…”

Section: Discussionsupporting

confidence: 77%

Strain Induced Abnormal Grain Growth in Nickel Base Superalloys

Bozzolo

Agnoli

Souaï

et al. 2013

MSF

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Under certain circumstances abnormal grain growth occurs in Nickel base superalloys during thermomechanical forming. Second phase particles are involved in the phenomenon, since they obviously do not hinder the motion of some boundaries, but the key parameter is here the stored energy difference between adjacent grains. It induces an additional driving force for grain boundary migration that may be large enough to overcome the Zener pinning pressure. In addition, the abnormal grains have a high density of twins, which is likely due to the increased growth rate.

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Section: Discussionsupporting

confidence: 77%

Strain Induced Abnormal Grain Growth in Nickel Base Superalloys

Bozzolo

Agnoli

Souaï

et al. 2013

MSF

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“…These three possible origins of the phenomenon were tested but no evidence was found for any of them: details will be presented in a forthcoming publication. On the contrary, the microstructure evolution in the strained sample appears to be a case of strain- [4]. This phenomenon leads to inhomogeneous grain growth after annealing of critically strained materials, where low dislocation density microstructures are formed and then few strain-free (low stored energy) grains can grow at the expanse of strained grains (high stored energy) during annealing.…”

Section: Resultsmentioning

confidence: 99%

Understanding and Modeling of Grain Boundary Pinning in Inconel 718

Agnoli¹,

Bernacki

Logé

et al. 2012

Superalloys 2012

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The microstructure stability during δ sub-solvus annealing was investigated in Inconel 718 alloy. A reference dynamically recrystallized microstructure was produced through thermomechanical processing (torsion). The reference microstructure evolution during annealing was analyzed by EBSD (grain size, intragranular misorientation) and SEM (δ phase particles). Results confirm that, in the absence of stored energy, the grain structure is controlled by the δ phase particles, as predicted by the Zener equation. If the reference microstructure is strained (ε < 0.1) before annealing, then stored energy gradients between grains will induce selective grain growth leading to coarsening. The phenomenon is controlled by the balance of three forces (acting on boundaries migration) having the same order of magnitude: capillarity, stored-energy and pinning forces. All these forces could be modeled in a single framework by the level set method. The first numerical results demonstrate the capability of the method to simulate 2D Zener pinning.

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“…For example, few bigger grains due to broad initial grain size distributions, [11] higher mobility boundaries due to texture, [12] or lower energy boundaries [13] can give rise to the phenomenon. Moreover, several studies [14][15][16] have reported that also small prior strains (e < 0.1) can produce abnormal grain growth during annealing both in single-phase materials and in alloys containing second-phase particles. In fact, it remains questionable if in this case the phenomenon can still be considered a case of abnormal grain growth (driven by capillarity).…”

Section: Factors Contributing To the Selective Grain Growth Processmentioning

confidence: 99%

Selective Growth of Low Stored Energy Grains During δ Sub-solvus Annealing in the Inconel 718 Nickel-Based Superalloy

Agnoli¹,

Bernacki

Logé

et al. 2015

Metall Mater Trans A

110

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The microstructure stability during d sub-solvus annealing in Inconel 718 was investigated, focusing on the conditions that may lead to the development of very large grains (about 100 lm) in a recrystallized fine grained matrix (4 to 5 lm) despite the presence of second-phase particles. Microstructure evolution was analyzed by EBSD (grain size, intragranular misorientation) and SEM (d phase particles). Results confirm that, in the absence of stored energy, the grain structure is controlled by the d phase particles, as predicted by the Smith-Zener equation. If the initial microstructure is strained (e < 0.1) before annealing, then low stored energy grains grow to a large extent, despite the Zener pinning forces exerted by the second-phase particles on the grain boundaries. Those selectively growing grains could be those of the initial microstructure that were the least deformed, or they could result from a nucleation process. The balance of three forces acting on boundary migration controls the growth process: if the sum of capillarity and stored energy driving forces exceeds the Zener pinning force, then selective grain growth occurs. Such phenomenon could be simulated, using a level set approach in a finite element context, by taking into account the three forces acting on boundary migration and by considering a realistic strain energy distribution (estimated from EBSD measurements).

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Strain-Induced Selective Growth in 1.5% Temper-Rolled Fe∼1%Si

Cited by 30 publications

References 27 publications

Strain Induced Abnormal Grain Growth in Nickel Base Superalloys

Strain Induced Abnormal Grain Growth in Nickel Base Superalloys

Understanding and Modeling of Grain Boundary Pinning in Inconel 718

Selective Growth of Low Stored Energy Grains During δ Sub-solvus Annealing in the Inconel 718 Nickel-Based Superalloy

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