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Nano-scale simulation of directional solidification in TWIP stainless steels: a focus on plastic deformation mechanisms

Bahramyan, Mehran, Taherzadeh Mousavian, Reza ORCID: 0000-0002-2274-3636, Carton, James ORCID: 0000-0002-8498-2544 and Brabazon, Dermot ORCID: 0000-0003-3214-6381 (2021) Nano-scale simulation of directional solidification in TWIP stainless steels: a focus on plastic deformation mechanisms. Materials Science and Engineering A, 821 . ISSN 0921-5093

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Abstract

In this study, in order to understand the nanostructure of FeCrNi steels in the laser powder bed fusion (LPBF) process, directional solidification was simulated using largescale molecular dynamics simulation (LSMDS). For this purpose, an atomic box with a dimension of including random dispersion of Fe, Cr and Ni was created. Then, two different fixed temperatures were considered for the left and right side of the box during cooling from the liquid molten state. For evaluation of the uniformity in mechanical properties, uniaxial tensile tests were performed in the parallel and perpendicular directions. Extensive twinning induced plasticity (TWIP) occurred alongside Shockley partial dislocations (DLs) evolution in both directions, while different ultimate tensile strengths (UTS) were obtained as a sign of nonuniform tensile behavior. Different plastic deformation mechanisms at the nano-scale including stacking faults (SFs) interaction with each other/grain boundaries (GBs)/twin boundaries (TBs), formation of defective coherent twins (DCTs), dynamic Hall-Petch, shear stress gradient (back stress), and a new mechanism for dynamic recrystallization at room temperature are discussed in detail.

Item Type:Article (Published)
Refereed:Yes
Additional Information:Article number: 140999
Uncontrolled Keywords:TWIP Stainless steel; Directional solidification; Plastic deformation; dynamics simulation
Subjects:UNSPECIFIED
DCU Faculties and Centres:DCU Faculties and Schools > Faculty of Engineering and Computing > School of Electronic Engineering
Research Initiatives and Centres > I-Form
Publisher:Elsevier
Official URL:https://dx.doi.org/10.1016/j.msea.2021.140999
Copyright Information:© 2021 The Authors. Open Access (CC-BY-4.0)
Funders:Science Foundation Ireland under Grant number 16/RC/3872
ID Code:26015
Deposited On:24 Jun 2021 15:36 by Thomas Murtagh . Last Modified 01 Mar 2022 15:16

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