2026-04-30T15:02:01Zhttps://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

Perez-Martin, Maria Jesus 2020-07-13T12:48:58Z 2020-07-13T12:48:58Z 2020 1996-1944 https://katalogoa.mondragon.edu/janium-bin/janium_login_opac.pl?find&ficha_no=159336 https://hdl.handle.net/20.500.11984/1789 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. eng Attribution 4.0 International http://creativecommons.org/licenses/by/4.0/ © 2020 by the authors. Licensee MDPI, Basel, Switzerland crystal plasticity nickel-base superalloy oligocrystal Finite element method high strain rates Crystal-plasticity-finite-element modeling of the dynamic response of a directionally solidified nickel-based superalloy http://purl.org/coar/resource_type/c_6501