Modelling plastic deformation in a single-crystal nickel-based superalloy using discrete dislocation dynamics

Background: Nickel-based superalloys are usually exposed to high static or cyclic loads in non-ambient environment, so a reliable prediction of their mechanical properties, especially plastic deformation, at elevated temperature is essential for improved damage-tolerance assessment of components. Me...

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Main Authors:	Bing Lin, Minsheng Huang, Farukh Farukh, Anish Roy, Vadim Silberschmidt, Liguo Zhao
Format:	Default Article
Published:	2016
Subjects:	Mechanical engineering not elsewhere classified Discrete dislocation dynamics Representative volume element Crystal plasticity Monotonic loading Cyclic deformation Mechanical Engineering not elsewhere classified
Online Access:	https://hdl.handle.net/2134/23064
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id	rr-article-9564704
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spelling	rr-article-95647042016-11-15T00:00:00Z Modelling plastic deformation in a single-crystal nickel-based superalloy using discrete dislocation dynamics Bing Lin (1253790) Minsheng Huang (7212650) Farukh Farukh (7202507) Anish Roy (1256436) Vadim Silberschmidt (1248129) Liguo Zhao (1250343) Mechanical engineering not elsewhere classified Discrete dislocation dynamics Representative volume element Crystal plasticity Monotonic loading Cyclic deformation Mechanical Engineering not elsewhere classified Background: Nickel-based superalloys are usually exposed to high static or cyclic loads in non-ambient environment, so a reliable prediction of their mechanical properties, especially plastic deformation, at elevated temperature is essential for improved damage-tolerance assessment of components. Methods: In this paper, plastic deformation in a single-crystal nickel-based superalloy CMSX4 at elevated temperature was modelled using discrete dislocation dynamics (DDD). The DDD approach was implemented using a representative volume element with explicitly-introduced precipitate and periodic boundary condition. The DDD model was calibrated using stress-strain response predicted by a crystal plasticity model, validated against tensile and cyclic tests at 850°C for <001> and <111> crystallographic orientations, at a strain rate of 1/s. Results: The DDD model was capable to capture the global stress-strain response of the material under both monotonic and cyclic loading conditions. Considerably higher dislocation density was obtained for the <111> orientation, indicating more plastic deformation and much lower flow stress in the material, when compared to that for <001> orientation. Dislocation lines looped around the precipitate, and most dislocations were deposited on the surface of precipitate, forming a network of dislocation lines. Simple unloading resulted in a reduction of dislocation density. Conclusions: Plastic deformation in metallic materials is closely related to dynamics of dislocations, and the DDD approach can provide a more fundamental understanding of crystal plasticity and the evolution of heterogeneous dislocation networks, which is useful when considering such issues as the onset of damage in the material during plastic deformation. 2016-11-15T00:00:00Z Text Journal contribution 2134/23064 https://figshare.com/articles/journal_contribution/Modelling_plastic_deformation_in_a_single-crystal_nickel-based_superalloy_using_discrete_dislocation_dynamics/9564704 CC BY 4.0
institution	Loughborough University
collection	Figshare
topic	Mechanical engineering not elsewhere classified Discrete dislocation dynamics Representative volume element Crystal plasticity Monotonic loading Cyclic deformation Mechanical Engineering not elsewhere classified
spellingShingle	Mechanical engineering not elsewhere classified Discrete dislocation dynamics Representative volume element Crystal plasticity Monotonic loading Cyclic deformation Mechanical Engineering not elsewhere classified Bing Lin Minsheng Huang Farukh Farukh Anish Roy Vadim Silberschmidt Liguo Zhao Modelling plastic deformation in a single-crystal nickel-based superalloy using discrete dislocation dynamics
description	Background: Nickel-based superalloys are usually exposed to high static or cyclic loads in non-ambient environment, so a reliable prediction of their mechanical properties, especially plastic deformation, at elevated temperature is essential for improved damage-tolerance assessment of components. Methods: In this paper, plastic deformation in a single-crystal nickel-based superalloy CMSX4 at elevated temperature was modelled using discrete dislocation dynamics (DDD). The DDD approach was implemented using a representative volume element with explicitly-introduced precipitate and periodic boundary condition. The DDD model was calibrated using stress-strain response predicted by a crystal plasticity model, validated against tensile and cyclic tests at 850°C for and crystallographic orientations, at a strain rate of 1/s. Results: The DDD model was capable to capture the global stress-strain response of the material under both monotonic and cyclic loading conditions. Considerably higher dislocation density was obtained for the orientation, indicating more plastic deformation and much lower flow stress in the material, when compared to that for orientation. Dislocation lines looped around the precipitate, and most dislocations were deposited on the surface of precipitate, forming a network of dislocation lines. Simple unloading resulted in a reduction of dislocation density. Conclusions: Plastic deformation in metallic materials is closely related to dynamics of dislocations, and the DDD approach can provide a more fundamental understanding of crystal plasticity and the evolution of heterogeneous dislocation networks, which is useful when considering such issues as the onset of damage in the material during plastic deformation.
format	Default Article
author	Bing Lin Minsheng Huang Farukh Farukh Anish Roy Vadim Silberschmidt Liguo Zhao
author_facet	Bing Lin Minsheng Huang Farukh Farukh Anish Roy Vadim Silberschmidt Liguo Zhao
author_sort	Bing Lin (1253790)
title	Modelling plastic deformation in a single-crystal nickel-based superalloy using discrete dislocation dynamics
title_short	Modelling plastic deformation in a single-crystal nickel-based superalloy using discrete dislocation dynamics
title_full	Modelling plastic deformation in a single-crystal nickel-based superalloy using discrete dislocation dynamics
title_fullStr	Modelling plastic deformation in a single-crystal nickel-based superalloy using discrete dislocation dynamics
title_full_unstemmed	Modelling plastic deformation in a single-crystal nickel-based superalloy using discrete dislocation dynamics
title_sort	modelling plastic deformation in a single-crystal nickel-based superalloy using discrete dislocation dynamics
publishDate	2016
url	https://hdl.handle.net/2134/23064
_version_	1797551445682159616

Modelling plastic deformation in a single-crystal nickel-based superalloy using discrete dislocation dynamics

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