Print Email Facebook Twitter Strain partitioning and damage initiation in a continuously cooled carbide free bainitic steel Title Strain partitioning and damage initiation in a continuously cooled carbide free bainitic steel Author Hajizad, O. (TU Delft Railway Engineering) Kumar, A. (TU Delft (OLD) MSE-3) Petrov, R.H. (TU Delft Team Kevin Rossi; Universiteit Gent) Sietsma, J. (TU Delft Team Kevin Rossi; Universiteit Gent) Dollevoet, R.P.B.J. (TU Delft Railway Engineering) Li, Z. (TU Delft Railway Engineering) Date 2022 Abstract Microscopic stress and strain partitioning control the mechanical and damage behavior of multiphase steels. Using a combined numerical and experimental approach, local strain distributions and deformation localization are characterized in a carbide free bainitic steel produced by continuous cooling. The microstructure of the steel consists of bainite (aggregate of bainitic ferrite and thin film retained austenite), martensite and blocky retained austenite. Numerical simulations were done using a von Mises J2 plasticity flow rule and also a phenomenological crystal plasticity material model. The representative volume element (RVE) was created using a realistic 2D geometry captured through Electron Backscatter Diffraction (EBSD). These simulations describe the strain distribution and deformation localization in this steel. To validate the simulation results, local strain maps were obtained experimentally via in-situ tensile testing using micro digital image correlation (µDIC) in scanning electron microscopy (SEM). The information gained from numerical and experimental data gave valuable insight regarding the microstructural features responsible for strain partitioning and damage initiation in this carbide free bainitic steel. The results of the modelling show that martensite, martensite/bainitic ferrite interfaces, interface orientation with respect to tensile direction, bainitic ferrite size and phase composition influence the strain partitioning in this carbide free bainitic steel. Subject Carbide free bainitic steelCrystal plasticity fast Fourier transform (CPFFT)Crystal plasticity finite element method (CPFEM)Damage initiationMicrostructural modeling To reference this document use: http://resolver.tudelft.nl/uuid:b8661416-534c-46ca-8642-d43fde6adace DOI https://doi.org/10.1016/j.commatsci.2021.110965 ISSN 0927-0256 Source Computational Materials Science, 202 Part of collection Institutional Repository Document type journal article Rights © 2022 O. Hajizad, A. Kumar, R.H. Petrov, J. Sietsma, R.P.B.J. Dollevoet, Z. Li Files PDF 1_s2.0_S0927025621006601_main.pdf 12.76 MB Close viewer /islandora/object/uuid:b8661416-534c-46ca-8642-d43fde6adace/datastream/OBJ/view