Recent Advances in EBSD Characterization of Metals

Carneiro, Íris; Simões, Sónia

doi:10.3390/met10081097

Cited by 58 publications

(21 citation statements)

References 101 publications

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“…This relies on the hypothesis that all subgrains are free of energy and could become recrystallized grains. However, in recent experimental studies, recrystallized grains are generally identified based on some parameter quantifying internal disorientation or directly upon GND density [ 1 , 36 ]. To correctly evaluate the recrystallized fraction and to compare the experimental data to numerical data, several criteria are defined and compared.…”

Section: Resultsmentioning

confidence: 99%

Simulation of Continuous Dynamic Recrystallization Using a Level-Set Method

Grand

Flipon

Gaillac³

et al. 2022

Materials

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Dynamic recrystallization is one of the main phenomena responsible for microstructure evolution during hot forming. Consequently, obtaining a better understanding of dynamic recrystallization mechanisms and being able to predict them is crucial. This paper proposes a full-field numerical framework to predict the evolution of subgrain structures upon grain growth, continuous dynamic recrystallization, and post-dynamic recrystallization. To be able to consider a subgrain structure, two strategies are proposed. One relies on a two-step tessellation algorithm to generate a fully substructured microstructure. The second strategy enables for the simulation of the formation of new subgrains during hot deformation. Using these tools, the grain growth of a fully substructured microstructure is modeled. The influence of microstructure topology, subgrain parameters, and some remaining stored energy due to plastic deformation is discussed. The results highlight that the selective growth of a limited number of subgrains is observed only when mobility is a sigmoidal function of disorientation. The recrystallization kinetics predicted with different criteria for discrimination of recrystallized grains are quantitatively compared. Finally, the ability of the framework to model continuous dynamic and post-dynamic recrystallization is assessed upon a case study representative of the hot extrusion of a zircaloy-4 billet (T=650 °C;ε˙=1.0s−1;εf=1.35). The influence of grain boundary properties and nucleation rules are quantified to evaluate the model sensitivity and suitability. Application of these numerical tools to other thermomechanical conditions and microstructures will be presented in an upcoming article.

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Section: Resultsmentioning

confidence: 99%

Simulation of Continuous Dynamic Recrystallization Using a Level-Set Method

Grand

Flipon

Gaillac³

et al. 2022

Materials

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“…For LPBF Ni-based superalloys, it is reported that the process parameters such as the laser power, scanning speed, hatching distance coupled to the scanning strategy have a crucial role in developing the crystallographic texture. This derives from the change of the energy delivered to the material, thus influencing its thermal history, such as heat flow direction, cooling rate, and temperature gradient [31][32][33][34][35].…”

Section: Grain Structures Evolution Under Solution Annealingmentioning

confidence: 99%

Microstructure and Hardness Evolution of Solution Annealed Inconel 625/TiC Composite Processed by Laser Powder Bed Fusion

Marchese

Aversa

Bassini

2021

Metals

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This study deals with the Inconel 625 (IN625) alloy reinforced with micro-TiC particles processed by laser powder bed fusion. The microstructure and hardness in the as-built and solution-annealed states were investigated. The microstructures of the as-built IN625 and IN625/TiC states were primarily made up of columnar grains along the building direction. After the solution annealing at 1150 °C for 2 h, the IN625 alloy consisted of equiaxed grains due to recrystallization and grain growth. On the contrary, the solution-annealed IN625/TiC composite still presented columnar grains. Therefore, the TiC particles hinder the recrystallization, indicating higher microstructure stability for the composite. For the IN625/TiC composite, both the reduced alteration of the grains and the more intensive formation of carbides prevent a remarkable hardness reduction in the solution-annealed state.

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“…Since the EBSD has been attracting enormous interest in the microstructural characterization of metals in recent years, all its potentials were covered by Carneiro et al [5]. This characterization technique has several advantages over conventional ones, since it allows for obtaining a wide range of characterization possibilities in a single method, which is not possible in others.…”

Section: Contributionsmentioning

confidence: 99%