The role of second phase particles and grain boundaries on recrystallization: Quasi-in situ experiments and modeling in U-10Mo alloy system

Reeve, Jacqueline I.; Schuessler, Benjamin; Frazier, William E.; Field, David P.; Joshi, Vineet V.

doi:10.1016/j.jnucmat.2021.153445

Cited by 7 publications

(3 citation statements)

References 33 publications

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“…Furthermore, orientation gradients can be seen in many grains, such as the G1-G8 grains in Figure 5g, as inhomogeneous distributions of colors were within these grains in the OIM map. Moreover, these grains with inhomogeneous orientations presented larger GOS values and grain sizes, as revealed in Figure 5h, implying that the specimen was mostly, but not completely, recrystallized after the hot forging and some deformed grains were reserved [48], i.e., pre-existing nonnegligible strains reserved in the initial material. Furthermore, the remaining deformation and unfinished recrystallization can be reinforced by the tangled low-angle grain boundaries (LAGB) in the grains with larger GOS, as indexed by the arrows in Figure 5g.…”

Section: The Origin Of Abnormal Grain Growth and Its Correlation With...mentioning

confidence: 96%

“…The grain orientation spread (GOS) measures the orientation deviation between all the points within a grain relative to the average orientation for that grain and is commonly used to characterize recrystallization [45]. A critical of GOS < 2 • for recrystallization is commonly used [45][46][47][48]. As a result, the GOS can be used as a credible index for identifying grain inhomogeneous deformation.…”

Section: The Origin Of Abnormal Grain Growth and Its Correlation With...mentioning

confidence: 99%

“…When the bonding process was modified, the hot forging alloy acted as the initial material before being bonded. The large primary γ and smaller secondary ones in the BM can provide a pinning force for the grain boundary migration [48,59,60]. Although the γ can solubilize at the supersolvus temperature (1140 • C for 1 h) in the bonding process, the solution at this condition is a time-consuming process, and the primary γ perhaps can partly remain, since the solution treatment of FGH96 was carried out at 1150 • C for 2 h in general operation.…”

Section: The Origin Of Abnormal Grain Growth and Its Correlation With...mentioning

confidence: 99%

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Effect of Abnormal Grains on the Mechanical Properties of FGH96 Solid-State Diffusion Bonding Joint

et al. 2022

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The hollow twin-web disk is designed to improve the thrust-to-weight ratio of the aero engine, where the welding joint microstructures determine the disk’s mechanical properties. This study aimed to elucidate the effect of abnormal grains formed in the welding region on the mechanical properties of FGH96 solid-state diffusion bonding joints. Digital image correlation using images captured by scanning electron microscopy (SEM-DIC) and electron backscattering diffraction (EBSD) technologies were applied. The results show that abnormally large grains (2.5 times that of the matrix), with preferred orientation in the bonding region, were detrimental to the joint mechanical properties. The yield and tensile strengths were 995.85 MPa and 1456.67 MPa, respectively, and the corresponding relative (ratio to the matrix) ones were 92.54% and 88.81%. After modifying the bonding process, the grain size in the bonding region was tailored to close to that of the matrix, and considerable twin boundaries (TBs) formed, leading to the relative tensile and yield strength reaching 98.86% and 99.37%. Furthermore, the failure mode changed to intragranular type from intergranular type. It demonstrates that tailoring the newborn grain size, introducing TBs inside, and eliminating preferred orientation during the welding process can be an efficient way to improve the joint mechanical properties.

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Section: The Origin Of Abnormal Grain Growth and Its Correlation With...mentioning

confidence: 96%

Section: The Origin Of Abnormal Grain Growth and Its Correlation With...mentioning

confidence: 99%

Section: The Origin Of Abnormal Grain Growth and Its Correlation With...mentioning

confidence: 99%

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Effect of Abnormal Grains on the Mechanical Properties of FGH96 Solid-State Diffusion Bonding Joint

et al. 2022

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An Integrated Simulation of Multiple-Pass U-10Mo Alloy Hot Rolling and Static Recrystallization

Frazier

Kalia

Wang

et al. 2023

Metall Mater Trans A

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To achieve a desired microstructure and minimize the thickness variation in rolled foils, researchers must understand the effects of foil fabrication process variables on microstructure evolution. We developed an integrated simulation of deformation and recrystallization that employs the finite element method (FEM) and the kinetic Monte Carlo (KMC) Potts model, respectively, to investigate microstructure evolution during multiple-pass hot rolling and heat treatment in polycrystalline U-10Mo fuel. Scanning electron microscopy and electron backscatter diffraction images of microstructures were directly used as input in FEM calculation of deformation, and the calculated strains were used to determine the driving force of nucleation and growth of recrystallized grains in the Potts model. Grain structures predicted by the Potts model were used to update the grain structure and material properties for FEM. Simulation alternated between FEM and the Potts model to simulate grain structure evolution during multiple rolling and heat treatments. The initial model parameters were determined by benchmarking the recrystallization kinetics against experimental data. Then, the model was applied to predict the grain structure evolution. Results showed that our model can capture the coupling between deformation and recrystallization and can quantitatively reproduce the observed U-10Mo recrystallization and grain growth kinetics. The simulation results demonstrated that the developed model can predict U-10Mo grain structures as a function of initial microstructure and foil fabrication parameters.

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Microstructure-process relationships in monolithic U-10Mo fuel foil single-pass rolling: A parametric simulation study

Frazier

Choi

et al. 2023

Journal of Nuclear Materials

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The role of second phase particles and grain boundaries on recrystallization: Quasi-in situ experiments and modeling in U-10Mo alloy system

Cited by 7 publications

References 33 publications

Effect of Abnormal Grains on the Mechanical Properties of FGH96 Solid-State Diffusion Bonding Joint

Effect of Abnormal Grains on the Mechanical Properties of FGH96 Solid-State Diffusion Bonding Joint

An Integrated Simulation of Multiple-Pass U-10Mo Alloy Hot Rolling and Static Recrystallization

Microstructure-process relationships in monolithic U-10Mo fuel foil single-pass rolling: A parametric simulation study

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