Crystal plasticity modeling and characterization of the deformation twinning and strain hardening in Hadfield steels

Matti Lindroos (Corresponding Author), Georges Cailletaud, Anssi Laukkanen, Veli Tapani Kuokkala

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9 Citations (Scopus)

Abstract

The deformation and strain hardening due to dislocation slip and twinning in Hadfield steels is investigated with a crystal plasticity model. A phenomenological interaction and hardening formulation is incorporated to the numerical model based on the microscopic characterization and deformation behavior. Single and polycrystal simulations on a Hadfield steel are conducted to prove the soundness of the model in describing the deformation and hardening behavior of the steel. The competition between dislocation slip and twin dominated deformation plays an essential role in the asymmetry between tension-compression as well as in the strain hardening behavior of the steel. The simulations performed on another Hadfield alloy verifies the model's capability to represent the strain rate sensitivity of the material, when a positive strain rate dependence exists. The use of realistic 3D polycrystalline aggregates imitating the microstructure of the Hadfield steels provides new insight into the inter-grain and intra-grain behavior of austenitic microstructures exhibiting twinning, particularly revealing the nature of local stress and twin concentrations. The strain rate sensitivity of the alloyed Hadfield steel is observed also at the grain scale, intensifying twinning at higher strain rates depending on the loading direction. The local gradients were found to arise from the neighbouring grains and from the intra-grain reorientation, explaining the experimental observations of only partially twinned grains. The simulation results and the 3D aggregate approach used in this paper provide information for the validation of crystal plasticity model as well as about the local deformation behavior of Hadfield steels.

Original languageEnglish
Pages (from-to)145-159
Number of pages15
JournalMaterials Science & Engineering A: Structural Materials: Properties, Microstructure and Processing
Volume720
DOIs
Publication statusPublished - 21 Mar 2018
MoE publication typeA1 Journal article-refereed

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strain hardening
Steel
Twinning
twinning
Strain hardening
plastic properties
hardening
Plasticity
steels
Crystals
strain rate
Strain rate
crystals
Hardening
slip
microstructure
Microstructure
simulation
stress concentration
Polycrystals

Keywords

  • Aggregate plasticity
  • Crystal plasticity
  • Deformation twinning
  • High strain rate
  • Microstructures

Cite this

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abstract = "The deformation and strain hardening due to dislocation slip and twinning in Hadfield steels is investigated with a crystal plasticity model. A phenomenological interaction and hardening formulation is incorporated to the numerical model based on the microscopic characterization and deformation behavior. Single and polycrystal simulations on a Hadfield steel are conducted to prove the soundness of the model in describing the deformation and hardening behavior of the steel. The competition between dislocation slip and twin dominated deformation plays an essential role in the asymmetry between tension-compression as well as in the strain hardening behavior of the steel. The simulations performed on another Hadfield alloy verifies the model's capability to represent the strain rate sensitivity of the material, when a positive strain rate dependence exists. The use of realistic 3D polycrystalline aggregates imitating the microstructure of the Hadfield steels provides new insight into the inter-grain and intra-grain behavior of austenitic microstructures exhibiting twinning, particularly revealing the nature of local stress and twin concentrations. The strain rate sensitivity of the alloyed Hadfield steel is observed also at the grain scale, intensifying twinning at higher strain rates depending on the loading direction. The local gradients were found to arise from the neighbouring grains and from the intra-grain reorientation, explaining the experimental observations of only partially twinned grains. The simulation results and the 3D aggregate approach used in this paper provide information for the validation of crystal plasticity model as well as about the local deformation behavior of Hadfield steels.",
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T1 - Crystal plasticity modeling and characterization of the deformation twinning and strain hardening in Hadfield steels

AU - Lindroos, Matti

AU - Cailletaud, Georges

AU - Laukkanen, Anssi

AU - Kuokkala, Veli Tapani

PY - 2018/3/21

Y1 - 2018/3/21

N2 - The deformation and strain hardening due to dislocation slip and twinning in Hadfield steels is investigated with a crystal plasticity model. A phenomenological interaction and hardening formulation is incorporated to the numerical model based on the microscopic characterization and deformation behavior. Single and polycrystal simulations on a Hadfield steel are conducted to prove the soundness of the model in describing the deformation and hardening behavior of the steel. The competition between dislocation slip and twin dominated deformation plays an essential role in the asymmetry between tension-compression as well as in the strain hardening behavior of the steel. The simulations performed on another Hadfield alloy verifies the model's capability to represent the strain rate sensitivity of the material, when a positive strain rate dependence exists. The use of realistic 3D polycrystalline aggregates imitating the microstructure of the Hadfield steels provides new insight into the inter-grain and intra-grain behavior of austenitic microstructures exhibiting twinning, particularly revealing the nature of local stress and twin concentrations. The strain rate sensitivity of the alloyed Hadfield steel is observed also at the grain scale, intensifying twinning at higher strain rates depending on the loading direction. The local gradients were found to arise from the neighbouring grains and from the intra-grain reorientation, explaining the experimental observations of only partially twinned grains. The simulation results and the 3D aggregate approach used in this paper provide information for the validation of crystal plasticity model as well as about the local deformation behavior of Hadfield steels.

AB - The deformation and strain hardening due to dislocation slip and twinning in Hadfield steels is investigated with a crystal plasticity model. A phenomenological interaction and hardening formulation is incorporated to the numerical model based on the microscopic characterization and deformation behavior. Single and polycrystal simulations on a Hadfield steel are conducted to prove the soundness of the model in describing the deformation and hardening behavior of the steel. The competition between dislocation slip and twin dominated deformation plays an essential role in the asymmetry between tension-compression as well as in the strain hardening behavior of the steel. The simulations performed on another Hadfield alloy verifies the model's capability to represent the strain rate sensitivity of the material, when a positive strain rate dependence exists. The use of realistic 3D polycrystalline aggregates imitating the microstructure of the Hadfield steels provides new insight into the inter-grain and intra-grain behavior of austenitic microstructures exhibiting twinning, particularly revealing the nature of local stress and twin concentrations. The strain rate sensitivity of the alloyed Hadfield steel is observed also at the grain scale, intensifying twinning at higher strain rates depending on the loading direction. The local gradients were found to arise from the neighbouring grains and from the intra-grain reorientation, explaining the experimental observations of only partially twinned grains. The simulation results and the 3D aggregate approach used in this paper provide information for the validation of crystal plasticity model as well as about the local deformation behavior of Hadfield steels.

KW - Aggregate plasticity

KW - Crystal plasticity

KW - Deformation twinning

KW - High strain rate

KW - Microstructures

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