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      Crystal-Plasticity-Finite-Element Modeling of the Quasi-Static and Dynamic Response of a Directionally Solidified Nickel-Base Superalloy

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          Abstract

          The flow stress behaviour of a directionally solidified nickel-base superalloy, MAR-M247, is presented through the combination of experiments and crystal-plasticity simulations. The experimental campaign encompassed quasi-static and dynamic testing in the parallel and perpendicular orientation with respect to the columnar grains. The material showed low strain-rate sensitivity in all cases. Virtual samples were generated with DREAM3d and each grain orientation was established according to the DS nature of the alloy. The elasto-visco-plastic response of each crystal is given by phenomenological-base equations, considering the dislocation–dislocation interactions among different slip systems. The hardening-function constants and the strain-rate sensitivity parameter were fitted with the information from tests parallel to the grain-growth direction and the model was able to predict with accuracy the experimental response in the perpendicular direction, confirming the suitability of the model to be used as a tool for virtual testing. Simulations also revealed that in oligocrystalline structures of this type, the yield-strength value is controlled by the grains with higher Schmid factor, while this influence decreases when plastic strain increases. Moreover, the analysis of the micro-fields confirmed that grains perpendicular to the loading axis are prone to nucleate cavities since the stresses in these regions can be twice the external applied stress.

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          Most cited references39

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          A Model for Boundary Diffusion Controlled Creep in Polycrystalline Materials

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            Diffusion-accommodated flow and superplasticity

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              Material rate dependence and localized deformation in crystalline solids

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                Author and article information

                Journal
                Materials (Basel)
                Materials (Basel)
                materials
                Materials
                MDPI
                1996-1944
                05 July 2020
                July 2020
                : 13
                : 13
                : 2990
                Affiliations
                [1 ]Department of Materials Science, E.T.S.I Caminos, Canales y Puertos, Universidad Politécnica de Madrid, 28040 Madrid, Spain; javier.segurado@ 123456upm.es (J.S.); f.galvez@ 123456upm.es (F.G.)
                [2 ]IMDEA Materials Institute, C/Eric Kandel 2, Getafe, 28906 Madrid, Spain
                [3 ]Department of Mechanics and Industrial Production, Mondragon Unibertsitatea, Loramendi 4, 20500 Mondragon, Spain; berice@ 123456mondragon.edu (B.E.); mjperez@ 123456mondragon.edu (M.-J.P.-M.)
                [4 ]IKERBASQUE, Basque Foundation for Science, 48013 Bilbao, Spain
                [5 ]Structural Impact Laboratory (SIMLab), Department of Structural Engineering, Norwegian University of Science and Technology (NTNU), NO-7491 Trondheim, Norway
                [6 ]Centre for Advanced Structural Analysis (CASA), NTNU, NO-7491 Trondheim, Norway
                Author notes
                [* ]Correspondence: rafael.sancho@ 123456upm.es
                Author information
                https://orcid.org/0000-0002-7635-0483
                https://orcid.org/0000-0003-0984-8449
                Article
                materials-13-02990
                10.3390/ma13132990
                7372437
                32635594
                6fd4663b-c6c1-4284-8579-f88e8cf730d0
                © 2020 by the authors.

                Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license ( http://creativecommons.org/licenses/by/4.0/).

                History
                : 05 June 2020
                : 29 June 2020
                Categories
                Article

                crystal plasticity,nickel-base superalloy,oligocrystal,finite element method,high strain rates

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