A 3D Polycrystalline Plasticity Model for Isotropic Linear Evolution of Intragranular Misorientation with Mesoscopic Plastic Strain in Stretched or Cyclically Deformed Metals

Two-dimensional electron back-scattered diffraction (2D-EBSD) mapping has been widely used for indicating the polycrystalline plasticity through intragranular misorientation parameters KAM and GROD, based on the empirically linear relationship between their average values and the mesoscopic plastic...

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Bibliographic Details
Published in:Metals (Basel ) 2022-12, Vol.12 (12), p.2159
Main Authors: Rui, Shao-Shi, Su, Yue, Zhao, Jia-Min, Shang, Zhi-Hao, Shi, Hui-Ji
Format: Article
Language:English
Subjects:
2D-EBSD mapping
3D polycrystalline plasticity model
Alloys
Chemical elements
Comparative analysis
Deformation
Evolution
Grain boundaries
Hypotheses
intragranular misorientation
isotropic linear evolution
KAM and GROD
Low alloy steels
mesoscopic plastic strain
Misalignment
Plastic deformation
Plastic properties
Polycrystals
Specialty steels
Strain
Three dimensional models
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Summary:Two-dimensional electron back-scattered diffraction (2D-EBSD) mapping has been widely used for indicating the polycrystalline plasticity through intragranular misorientation parameters KAM and GROD, based on the empirically linear relationship between their average values and the mesoscopic plastic strain, in both stretched and cyclically deformed metals. However, whether the intragranular misorientation measured on the 2D-EBSD observational plane objectively reflects the 3D polycrystalline plasticity or not is a rarely reported issue. In this research, we firstly compared the KAM and GROD values measured on 2D-EBSD observational planes with different angles to loading axis of a specimen in both undeformed clamp sections and deformed gauge section, to verify whether their average values increase isotropically or not with mesoscopic plastic strain. Then, we proposed six fundamental assumptions and developed a modified 3D polycrystalline plasticity model based on the 2D polycrystalline plasticity model in our previous work. This 3D polycrystalline plasticity model can explain the isotropic linear evolution of intragranular misorientation in deformed low alloy steel with uniform equiaxial grains.
ISSN:2075-4701
2075-4701
DOI:10.3390/met12122159