2026-04-30T12:07:11Zhttps://ebiltegia.mondragon.edu/oai/request

oai:ebiltegia.mondragon.edu:20.500.11984/17892024-03-05T12:14:29Zcom_20.500.11984_473col_20.500.11984_478

Crystal-plasticity-finite-element modeling of the dynamic response of a directionally solidified nickel-based superalloy Perez-Martin, Maria Jesus Sancho, Rafael Segurado, Javier Erice, Borja Gálvez, Francisco crystal plasticity nickel-base superalloy oligocrystal Finite element method high strain rates 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 andperpendicular orientation with respect to the columnar grains. The material showed low strain-ratesensitivity in all cases. Virtual samples were generated with DREAM3d and each grain orientation wasestablished according to the DS nature of the alloy. The elasto-visco-plastic response of each crystalis given by phenomenological-base equations, considering the dislocation–dislocation interactionsamong different slip systems. The hardening-function constants and the strain-rate sensitivityparameter were fitted with the information from tests parallel to the grain-growth direction and themodel 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 alsorevealed that in oligocrystalline structures of this type, the yield-strength value is controlled bythe 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 areprone to nucleate cavities since the stresses in these regions can be twice the external applied stress. 2020-07-13T12:48:58Z 2020-07-13T12:48:58Z 2020 http://purl.org/coar/resource_type/c_6501 1996-1944 https://katalogoa.mondragon.edu/janium-bin/janium_login_opac.pl?find&ficha_no=159336 https://hdl.handle.net/20.500.11984/1789 eng Attribution 4.0 International http://creativecommons.org/licenses/by/4.0/ © 2020 by the authors. Licensee MDPI, Basel, Switzerland