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Revealing per-grain and neighbourhood stress interactions of a deforming ferritic steel via three-dimensional X-ray diffraction

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jats:titleAbstract</jats:title>jats:pThe structural performance of polycrystalline alloys is strongly controlled by the characteristics of individual grains and their interactions, motivating this study to understand the dynamic micromechanical response within the microstructure. Here, a high ductility single-phase ferritic steel during uniaxial deformation is explored using three-dimensional X-ray diffraction. Grains well aligned for dislocation slip are shown to possess a wide intergranular stress range, controlled by per-grain dependent hardening activity. Contrariwise, grains orientated poorly for slip have a narrow stress range. A grain neighbourhood effect is observed of statistical significance: the Schmid factor of serial adjoining grains influences the stress state of a grain of interest, whereas parallel neighbours are less influential. This phenomenon is strongest at low plastic strains, with the effect diminishing as grains rotate during plasticity to eliminate any orientation dependent load shedding. The ability of the ferrite to eliminate such neighbourhood interactions is considered key to the high ductility possessed by these materials.</jats:p>


Acknowledgements: This work was supported by Diamond Light Source, instrument I12 [NT26376] and the Engineering and Physical Sciences Research Council [EP/R030537/1]. J.A.D.B. would like to thank the Diamond Light Source and the University of Birmingham for jointly funding his PhD program, as well as Anastasia Vrettou and Neal Parkes for their help with the sample preparation process, and Younes El-Hachi and Jon Wright for their assistance with the bootstrap method of grain parameter error determination.


40 Engineering, 3403 Macromolecular and Materials Chemistry, 4016 Materials Engineering, 34 Chemical Sciences

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Communications Materials

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Springer Science and Business Media LLC
RCUK | Engineering and Physical Sciences Research Council (EPSRC) (EP/R030537/1)
Diamond Light Source (NT26376)