FEM Simulation of microstructure refinement during severe deformation

Olga Bylya, M K Sarangi, N V Ovchinnikova, R A Vasin, E B Yakushina, P L Blackwell

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

The majority of methods of severe plastic deformation (SPD) used for producing ultra-fine grained (UFG) and nano materials involve the non-uniform distribution of strains in the workpiece. To make the refinement of grains uniform, interlinked operations are used in which either the orientation of the workpiece or the type of SPD is changed in some sequence. Each operation has its own set of control parameters affecting the output result. As a result, the optimization of the total chain of operations becomes very difficult, especially taking into account that each stage of material processing comes from the previous one with a certain non-uniformity of the structure. To deal with such types of problems the capability of tracing the transformation of the microstructure and accounting for its effect on mechanical properties in finite element modeling (FEM) is required. There are a number of detailed physical models of grain refinement and texture formation, but very often they are too complicated for practical engineering simulations. The mechanics of SPD are also studied and simulated in many works, but normally it is assumed that material is uniform, isotropic and its properties don't change during deformation. In this paper a microstructurally-coupled FE model of the SPD process is proposed. The question of selection and verification of macroscopic and microscopic constitutive relations is discussed. The results of a simulation made in QForm are analyzed and compared with some initial experimental data.
LanguageEnglish
Article number012033
Number of pages10
JournalIOP Conference Series: Materials Science and Engineering
Volume63
Early online date8 Aug 2014
DOIs
Publication statusPublished - 2014

Fingerprint

plastic deformation
Plastic deformation
microstructure
Microstructure
Computer simulation
simulation
Grain refinement
tracing
nonuniformity
Mechanics
textures
Textures
engineering
mechanical properties
Mechanical properties
optimization
output
Processing

Keywords

  • severe plastic deformation
  • ultra fine grained nanomaterials
  • nanomaterial
  • finite element modeling
  • tempering
  • cold working

Cite this

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title = "FEM Simulation of microstructure refinement during severe deformation",
abstract = "The majority of methods of severe plastic deformation (SPD) used for producing ultra-fine grained (UFG) and nano materials involve the non-uniform distribution of strains in the workpiece. To make the refinement of grains uniform, interlinked operations are used in which either the orientation of the workpiece or the type of SPD is changed in some sequence. Each operation has its own set of control parameters affecting the output result. As a result, the optimization of the total chain of operations becomes very difficult, especially taking into account that each stage of material processing comes from the previous one with a certain non-uniformity of the structure. To deal with such types of problems the capability of tracing the transformation of the microstructure and accounting for its effect on mechanical properties in finite element modeling (FEM) is required. There are a number of detailed physical models of grain refinement and texture formation, but very often they are too complicated for practical engineering simulations. The mechanics of SPD are also studied and simulated in many works, but normally it is assumed that material is uniform, isotropic and its properties don't change during deformation. In this paper a microstructurally-coupled FE model of the SPD process is proposed. The question of selection and verification of macroscopic and microscopic constitutive relations is discussed. The results of a simulation made in QForm are analyzed and compared with some initial experimental data.",
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FEM Simulation of microstructure refinement during severe deformation. / Bylya, Olga; Sarangi, M K; Ovchinnikova, N V; Vasin, R A ; Yakushina, E B; Blackwell, P L.

In: IOP Conference Series: Materials Science and Engineering, Vol. 63, 012033, 2014.

Research output: Contribution to journalArticle

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T1 - FEM Simulation of microstructure refinement during severe deformation

AU - Bylya, Olga

AU - Sarangi, M K

AU - Ovchinnikova, N V

AU - Vasin, R A

AU - Yakushina, E B

AU - Blackwell, P L

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AB - The majority of methods of severe plastic deformation (SPD) used for producing ultra-fine grained (UFG) and nano materials involve the non-uniform distribution of strains in the workpiece. To make the refinement of grains uniform, interlinked operations are used in which either the orientation of the workpiece or the type of SPD is changed in some sequence. Each operation has its own set of control parameters affecting the output result. As a result, the optimization of the total chain of operations becomes very difficult, especially taking into account that each stage of material processing comes from the previous one with a certain non-uniformity of the structure. To deal with such types of problems the capability of tracing the transformation of the microstructure and accounting for its effect on mechanical properties in finite element modeling (FEM) is required. There are a number of detailed physical models of grain refinement and texture formation, but very often they are too complicated for practical engineering simulations. The mechanics of SPD are also studied and simulated in many works, but normally it is assumed that material is uniform, isotropic and its properties don't change during deformation. In this paper a microstructurally-coupled FE model of the SPD process is proposed. The question of selection and verification of macroscopic and microscopic constitutive relations is discussed. The results of a simulation made in QForm are analyzed and compared with some initial experimental data.

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