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A 2D and 3D microstructural descriptor approach to bainitic steels: Insights from phase-field simulations

D. Nerella, T. Jogi, Oguz Gulbay, M. Ali, O. Shchyglo, I. Steinbach

Acta Materialia, 314, 122340, (2026)

DOI: https://doi.org/10.1016/j.actamat.2026.122340

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Understanding the morphology and spatial orientation of microstructures is essential for predicting and optimizing the macroscopic behavior of advanced steels. In this study, we present a unified framework for microstructural characterization that combines experimental analysis with phase-field simulations. On the experimental side, two-point spatial correlation analysis of EBSD-derived microstructures was employed to quantify variant morphology, thickness and spacing, establishing a robust baseline for validating computational predictions. Complementing this, three-dimensional phase-field simulations were carried out under applied strains representative of press hardening conditions. Two-dimensional image analysis enabled the extraction of conventional morphological descriptors such as area, length, thickness, aspect ratio, compactness and eccentricity from cross-sections, while three-dimensional statistical measures based on 2-point statistics quantified spatial correlations, anisotropic growth and variant alignment across the simulated volume. The combination of conventional descriptors with statistical correlations provides a multiscale and multidimensional perspective on the evolution of bainitic microstructures. This integrated approach advances the understanding of complex morphological anisotropy, strengthens process–structure relationships and establishes a foundation for data-driven design of high-performance steels subjected to thermo-mechanical conditions.

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{"type":"article", "name":"d.nerella20268", "author":"D. Nerella and T. Jogi and Oguz Gulbay and M. Ali and O. Shchyglo and I. Steinbach", "title":"A 2D and 3D microstructural descriptor approach to bainitic steels: Insights from phasefield simulations", "journal":"Acta Materialia", "volume":"314", "OPTnumber":"", "OPTmonth":"8", "year":"2026", "OPTpages":"122340", "OPTnote":"", "OPTkey":"Bainite; Microstructure; 3D morphological features; Phase-field", "DOI":"https://doi.org/10.1016/j.actamat.2026.122340"}
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