A multiscale approach for the deformation mechanism in pearlite microstructure: Numerical evaluation of elasto-plastic deformation in fine lamellar structures

Ohashi, Tetsuya; Roslan, Lidyana; Takahashi, Kohsuke; Shimokawa, Tomotsugu; Tanaka, Masaki; Higashida, Kenji

doi:10.1016/j.msea.2013.09.032

Cited by 37 publications

(31 citation statements)

References 21 publications

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“…Especially, the strain hardening rate is most important factor. 8) In this analysis, the strain hardening rate of the α-layer with Bagaryatsky relationship is the same or more than that of ferrite5 when lamellar thickness is 50 nm. On the other hand, the strain hardening rate of the α-layer with Pitsch-Petch relationship is inferior to that with Bagaryatsky relationship.…”

Section: Resultsmentioning

confidence: 81%

“…5,6) Dislocations needed for the plastic deformation of cementite layer are supplied from the ferrite layers 7) and the stable plastic deformation of cementite layer is realized when yield stress and strain hardening rate of the ferrite layers are increased. 8) Thickness of ferrite layer decreases with reduction of cross-section area of pearlite wire by drawing. 1,2,4) Thereby, dislocation density in the ferrite layer increases 1) and subgrain boundary forms in the ferrite layer for heavy drawing.…”

Section: Introductionmentioning

confidence: 98%

“…10,11) Annealing decreases yield stress while increases strain hardening rate. The increase of strain hardening rate of ferrite layer is especially effective for stabilization of plastic deformation in cementite layer 8) and considered to be one of the reasons for recovery of ductility in annealed pearlite. 9) Therefore, to clarify the scale effect caused by the dislocations' behavior in the ferrite layer is practically useful for fabrication of pearlite with high strength and good ductility.…”

Section: Introductionmentioning

confidence: 99%

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Crystal Plasticity Analyses of Scale Dependent Mechanical Properties of Ferrite/Cementite Lamellar Structure Model in Pearlite Steel Wire with Bagaryatsky or Pitsch-Petch Orientation Relationship

Yasuda

Ohashi

2016

ISIJ Int.

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Mechanical properties of simplified model of ferrite/cementite lamellar structure in pearlite steel wire are examined by a strain gradient crystal plasticity analysis. Bagaryatsky and Pitsch-Petch relationships are used to determine crystallographic orientations of ferrite and cementite phases. Obtained results show that yield stress and strain hardening rate increase with reduction of lamellar thickness of ferrite layer and this increase is larger in the model with Bagaryatsky relationship than that with Pitsch-Petch one. Detailed mechanism that leads to this significant change in macroscopic mechanical response is discussed from the view point of dislocations' behavior. Strain incompatibility effect between phases on the mechanical response is shown to be relatively small.

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Section: Resultsmentioning

confidence: 81%

Section: Introductionmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

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Crystal Plasticity Analyses of Scale Dependent Mechanical Properties of Ferrite/Cementite Lamellar Structure Model in Pearlite Steel Wire with Bagaryatsky or Pitsch-Petch Orientation Relationship

Yasuda

Ohashi

2016

ISIJ Int.

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“…Monolithic cementite is a brittle material, but in pearlite the lamellar structure stabilizes the cementite allowing it to deform plastically [37,38]. Because of the computational methods used in this study, it is assumed that cementite deforms by slip.…”

Section: Pearlitementioning

confidence: 99%

Developing constitutive model parameters via a multi-scale approach

Anglin

Gockel

Rollett

2016

Integr Mater Manuf Innov

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Computing the mechanical response of materials requires accurate constitutive descriptions, especially their plastic behavior. Furthermore, the ability of a model to be used as a predictive, rather than a descriptive, tool motivates the development of physically based constitutive models. This work investigates combining a homogenized viscoplastic self-consistent (VPSC) approach to reduce the development time for a high-resolution viscoplastic model based on the fast Fourier transform (FFT). An optimization scheme based on a least-squares algorithm is presented. The constitutive responses of copper, interstitial-free steel, and pearlite are investigated, and the model parameters are presented. Optimized parameters from the low-fidelity model provide close agreement (<2 MPa,~1 % error) with stress-strain data at low strains (<10 %) in the high-fidelity FFT model. Simple adjustments to constitutive law parameters bring the FFT stress-strain curve in alignment with experimental data at strains greater than 10 %. A two-phase constitutive law is developed for a pearlitic steel using a single stress-strain curve, supplemented by data for the constituent phases. Sources of error and methods of using material information are discussed that lead to optimal estimates of initial parameter values.

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“…For instance, an elastoplastic model is adopted in Ref. [7] to investi gate the macroscopic hardening behavior by using a modified Swift equation describing the stress-strain relationship. Such a model, however, does not have a direct reference to the inhomo geneous deformation fields on gain levels.…”

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confidence: 99%

Crystal Plasticity Analysis of Stress Partitioning Mechanisms and Their Microstructural Dependence in Advanced Steels

Chen

Gao

2015

Journal of Applied Mechanics

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Two-phase advanced steels have an optimized combination o f high yield strength and large elongation strain at failure, as a result o f stress partitioning between a hard phase (martensite) and a ductile phase (ferrite or austenite). Provided with strong interfaces between the constituent phases, the failure in the brittle martensite phase will be delayed by the surrounding geometric constraints, while the rule o f mixture will dictate a targe strength of the composite. To this end, the microstructural design o f these composites is imperative especially in terms o f the stress partitioning mechanisms among the constitu ent phases. Based on the characteristic microstructures o f dual phase and multilayered steels, two polycrystalline aggregate models are constructed to simulate the microscopic lattice strain evolution o f these materials during uniaxial tensile tests. By comparing the lattice strain evolution from crystal plasticity finite element simulations with advanced in situ diffraction measurements in literature, this study investigates the correlations between the material microstructure and the micromechanical interactions on the inter granular and interphase levels. It is found that although the applied stress will be ulti mately accommodated by the hard phase and hard grain families, the sequence o f the stress partitioning on grain and phase levels can be altered by microstructural designs. Implications o f these findings on delaying localized failure are also discussed. Keywords: dual phase steel, multilayered steel, lattice strain, crystal plasticity finite element methodDemands from automotive and aerospace industries have stimulated the investigations of multiphase steels that can achieve both high strength and high ductility and thus have tremendous applications in vehicle and aircraft body structures. In advanced high strength steels (AHSS) [1] that are broadly used in these applications, two phases are introduced, including a hard phase that provides high strength and the other phase that is capable of large elongation prior to failure. As a result of complex intergra nular and interphase interactions, a good balance of strength and elongation strain can be achieved. One example is the dual phase (DP) steel, consisting of low-carbon, hard martensite phase (about 5-30 vol. %) dispersed in the ferrite matrix [2-4], An alternative design beyond AHSS is the multilayered steel as processed by rolling bonding of stacked, alternating martensite and austenite layers [1,5,6], On the so-called "banana curves" plotting the ten sile strength against fracture elongation (i.e., a ductility measure) in Ret.[1], DP steel shows a better combination of strength and ductility than conventional steels. However, the multilayered steel has the potential to even outperform than the DP steel as shown in Ref.[1] and as reviewed in Ref.[6], Provided with strong interfaces between the constituent phases, the failure strain in the brittle martensite phase will be delayed by the surrounding geometric constraints, while the...

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A multiscale approach for the deformation mechanism in pearlite microstructure: Numerical evaluation of elasto-plastic deformation in fine lamellar structures

Cited by 37 publications

References 21 publications

Crystal Plasticity Analyses of Scale Dependent Mechanical Properties of Ferrite/Cementite Lamellar Structure Model in Pearlite Steel Wire with Bagaryatsky or Pitsch-Petch Orientation Relationship

Crystal Plasticity Analyses of Scale Dependent Mechanical Properties of Ferrite/Cementite Lamellar Structure Model in Pearlite Steel Wire with Bagaryatsky or Pitsch-Petch Orientation Relationship

Developing constitutive model parameters via a multi-scale approach

Crystal Plasticity Analysis of Stress Partitioning Mechanisms and Their Microstructural Dependence in Advanced Steels

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