A novel unified dislocation density-based model for hot deformation behavior of a nickel-based superalloy under dynamic recrystallization conditions

In this study, a novel unified dislocation density-based model is presented for characterizing hot deformation behaviors in a nickel-based superalloy under dynamic recrystallization (DRX) conditions. In the Kocks–Mecking model, a new softening item is proposed to represent the impacts of DRX behavio...

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Published inApplied physics. A, Materials science & processing Vol. 122; no. 9; pp. 1 - 16
Main Authors Lin, Y. C., Wen, Dong-Xu, Chen, Ming-Song, Chen, Xiao-Min
Format Journal Article
LanguageEnglish
Published Berlin/Heidelberg Springer Berlin Heidelberg 01.09.2016
Springer Nature B.V
Subjects
Applied physics
Characterization and Evaluation of Materials
Condensed Matter Physics
Deformation
Dislocation density
Dynamic recrystallization
Evolution
Grain size
Kinetics
Machines
Manufacturing
Materials science
Mathematical models
Nanotechnology
Nickel
Nickel base alloys
Optical and Electronic Materials
Physics
Physics and Astronomy
Processes
Strain rate
Superalloys
Surfaces and Interfaces
Thin Films
Dynamic Recrystallization
Deformation Temperature
Phenomenological Constitutive Model
Dislocation Density Evolution
Dislocation Density
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Summary:In this study, a novel unified dislocation density-based model is presented for characterizing hot deformation behaviors in a nickel-based superalloy under dynamic recrystallization (DRX) conditions. In the Kocks–Mecking model, a new softening item is proposed to represent the impacts of DRX behavior on dislocation density evolution. The grain size evolution and DRX kinetics are incorporated into the developed model. Material parameters of the developed model are calibrated by a derivative-free method of MATLAB software. Comparisons between experimental and predicted results confirm that the developed unified dislocation density-based model can nicely reproduce hot deformation behavior, DRX kinetics, and grain size evolution in wide scope of initial grain size, strain rate, and deformation temperature. Moreover, the developed unified dislocation density-based model is well employed to analyze the time-variant forming processes of the studied superalloy.
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ISSN:0947-8396
1432-0630
DOI:10.1007/s00339-016-0333-z