Strain hardening behavior of DP 590 steel using dislocation density based Kock-Mecking model

Pandre, Sandeep; Mhatre, Varun; Kotkunde, Nitin; Singh, Swadesh Kumar

doi:10.1016/j.matpr.2020.02.810

Cited by 11 publications

(3 citation statements)

References 12 publications

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“…The strain rate used in the molecular dynamics simulations is always several orders of magnitude higher than that used in experiments, usually less than 10 4 s −1 [ 41 , 42 , 43 ]. To study the interface fracture behavior under the “low strain rate” situation, quasi-static fracture simulations under 0K were commonly used [ 38 , 44 , 45 ].…”

Section: Models and Methodsmentioning

confidence: 99%

Nanostructure, Plastic Deformation, and Influence of Strain Rate Concerning Ni/Al2O3 Interface System Using a Molecular Dynamic Study (LAMMPS)

2023

Nanomaterials

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The plastic deformation mechanisms of Ni/Al2O3 interface systems under tensile loading at high strain rates were investigated by the classical molecular dynamics (MD) method. A Rahman–Stillinger–Lemberg potential was used for modeling the interaction between Ni and Al atoms and between Ni and O atoms at the interface. To explore the dislocation nucleation and propagation mechanisms during interface tensile failure, two kinds of interface structures corresponding to the terminating Ni layer as buckling layer (Type I) and transition layer (Type II) were established. The fracture behaviors show a strong dependence on interface structure. For Type I interface samples, the formation of Lomer–Cottrell locks in metal causes strain hardening; for Type II interface samples, the yield strength is 40% higher than that of Type I due to more stable Ni-O bonds at the interface. At strain rates higher than 1×109 s−1, the formation of L-C locks in metal is suppressed (Type I), and the formation of Shockley dislocations at the interface is delayed (Type II). The present work provides the direct observation of nucleation, motion, and reaction of dislocations associated with the complex interface dislocation structures of Ni/Al2O3 interfaces and can help researchers better understand the deformation mechanisms of this interface at extreme conditions.

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Section: Models and Methodsmentioning

confidence: 99%

Nanostructure, Plastic Deformation, and Influence of Strain Rate Concerning Ni/Al2O3 Interface System Using a Molecular Dynamic Study (LAMMPS)

2023

Nanomaterials

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“…These results are in agreement with previous work dealing with the strain hardening behavior of ferrite-martensite dual phase steels. [32][33][34][35][36][37]. According to these studies, the rst stage is associated with the plastic deformation of the ferrite matrix, while the second stage involves the plastic deformation of both ferrite and martensite.…”

Section: Tensile Properties and Strain Hardening Behaviormentioning

confidence: 99%

Microstructural and mechanical properties of dissimilar SMAW process joints of DP Steels obtained by intercritical heat treatment from AISI 1010 steel

LAROUI,

Chegroune,

Hariti

et al. 2023

Preprint

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Dual phase steel is a kind of advanced high strength steel used in automotive industry to reduce a fuel consumption. The present study assesses the microstructural and mechanical behavior of a dissimilar butt-welded dual-phase steel by Shielded Metal Arc Welding process. The ferrite phase with variable martensite fraction from 27–70% was obtained by water quenching at different inter-critical temperatures from a plate carbon steel AISI 1010 having a microstructure consisting of ferrite and pearlite. The mechanical properties, strength and ductility of DP steels were influenced by martensite volume fraction (MVF). When MVF reached value of 70%, the strength was improved by 28% and the elongation was decreased by 25%. Additionally, the DP steels obey to the two-stage strain hardening behavior. The obtained DP steels were welded by a shield metal arc weld (SMAW) process in a single pass while maintaining a constant heat input. Systematic analysis of dissimilar welded joints, microstructure and microhardness, revealed that the fusion zones remain unchanged. Tensile test of weld joints showed lower ultimate tensile strength (UTS), elongation and strain hardening exponent compared to the dual phase (DP) steel. The DP700/DP900 welded joint have the highest ultimate tensile strength compared to the other welded joints due to its higher martensite volume fraction.

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“…where  is dislocation density. The equivalent stress of polycrystalline can be expressed by Talyor's equation [19]:…”

Section: Numerical Simulation and Experiments Arrangement 21 Dislocation Density-based Hardening Modelmentioning

confidence: 99%

Experimental and Numerical Study of Cold Helical Rolling of Small-Diameter Steel Balls

Liu

et al. 2021

Preprint

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Cold helical rolling (CHR) is one of the most effective ways to produce small-diameter steel balls. In this study, one kind of work hardening model was established and implemented into Simufact 15.0 to investigate the work hardening phenomenon in the cold forming process. Firstly, based on the helical rolling theory, a set of finite element (FE) simulations was developed. The influence of CHR parameters, including the starting height of convex rib, forming area length, and rolling inclination angle, on the forming process was studied via simulation. Furtherly, the CHR process experiments and FE simulation were carried out , the results showed that the FE simulation was in good agreement with the experimental results, and consistent with the predicted value of the theoretical calculation. Finally, the evolution of effective strain, effective stress, rolling force, work hardening and microstructure during the cold helical rolling of Φ 5.12 mm steel balls was investigated via FE. As result, the evolution trend of hardness was consistent with that of dislocation density, indicating that the model is credible. Besides, the microstructure of the steel ball at different positions further verified this.

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Strain hardening behavior of DP 590 steel using dislocation density based Kock-Mecking model

Cited by 11 publications

References 12 publications

Nanostructure, Plastic Deformation, and Influence of Strain Rate Concerning Ni/Al2O3 Interface System Using a Molecular Dynamic Study (LAMMPS)

Nanostructure, Plastic Deformation, and Influence of Strain Rate Concerning Ni/Al2O3 Interface System Using a Molecular Dynamic Study (LAMMPS)

Microstructural and mechanical properties of dissimilar SMAW process joints of DP Steels obtained by intercritical heat treatment from AISI 1010 steel

Experimental and Numerical Study of Cold Helical Rolling of Small-Diameter Steel Balls

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