Effects of Solute Carbon on the Work Hardening Behavior of Lath Martensite in Low-Carbon Steel

Niino, Taku; Inoue, Junya; Ojima, Masahiro; Nambu, Shoichi; Koseki, Takafumi

doi:10.2355/isijinternational.isijint-2016-430

Cited by 16 publications

(5 citation statements)

References 26 publications

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“…For the martensite phase, an increased amount of carbon is assumed to affect the dislocation storage in low-carbon lath martensite [51]. Due to carbon's strong interaction with dislocations, the dislocation mean free path L m is assumed to be inversely proportional to the carbon content in the phase: where c m L is the proportionality constant for lath martensitic steel, which is determined by fitting to experimental data and C m C is wt.% of carbon in the martensite phase.…”

Section: Single-phase Model Of Ferrite and Martensitementioning

confidence: 99%

“…This assumption is consistent with microstructural observations of the effects of carbon solute on dislocation motion in lath martensite. Niino et al [51] reported that the carbon solute reduces the mobility of dislocations and increases their multiplication during deformation. The annihilation parameter of martensite k m is assumed to be constant independent on the carbon content.…”

Section: Single-phase Model Of Ferrite and Martensitementioning

confidence: 99%

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A numerical study on the effects of DP steel microstructure on the yield locus and the stress–strain response under strain path change

et al. 2023

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The mechanical response of dual phase (DP) steel exhibits a complex dependence on the microstructure. The chemical composition and microstructure characteristics of the phases have significant effects on the contrast between the response of the phases, which affects, not only the strength and ductility, but also the anisotropic response of DP steel under strain path changes. In this work, extended dislocation-based models of the ferrite and martensite phases of DP steel are proposed and used in a finite element based representative volume element approach to account for the contrast between the local response of the phases. The flow stress of each phase is computed as a function of the amount of substitutional and interstitial solute elements and the microstructural characteristics of the phase. Particular attention is paid to the phase model of the martensite phase. The model parameter controlling the storage of dislocations is related to the carbon content, which appears to be the most important parameter affecting the strength of martensite and its contrast with the local response of the ferrite phase. The model predicts a significant effect of the contrast between the local responses of the phases and the microstructure characteristics of each phase on the yield locus after prestraining and on the stress–strain behaviour after strain path change, i.e., forward-reverse shear loading and cyclic uniaxial tension–compression loading.

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Section: Single-phase Model Of Ferrite and Martensitementioning

confidence: 99%

Section: Single-phase Model Of Ferrite and Martensitementioning

confidence: 99%

A numerical study on the effects of DP steel microstructure on the yield locus and the stress–strain response under strain path change

et al. 2023

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“…2d). The high dislocation density and the presence of internal twins in martensite may result in its high strength, hardness and poor plasticity [20,21] . For the intermediate zone, the FC area has a noticeable effect on the middle part so that its cooling rate is much higher than the normal air cooling.…”

Section: Discussionmentioning

confidence: 99%

A new preparation technology of structural-gradient materials without a brittle transition zone in a Mn-Si-Cr-B bainitic cast steel

Zhao

Wang

et al. 2018

China Foundry

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S tructural-gradient-materials (SGMs), because of their characteristic of different positions with different mechanical properties, have been paid more and more attention for special features requested by some certain applications. With the development of materials science, many manufacturing techniques for gradient materials have been developed, including powder metallurgy [1] , chemical vapor deposition [2] , diff usion bonding [3] and laser smelting deposition [4] , etc. As is k now n, in vestiga tion on designing & manufacturing technology for automobile components has always been a fundamental and critical issue. Especially, the complicated parts may need to meet different requirements of performance in different positions. For example, the rear axle, on the one hand, is required to provide high strength and rigidity at both

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“…They, having a dislocation density of up to 10 15 /m 2 , are typically manufactured by quickly cooling austenite to room temperature with diffusion-free shear [3e7]. Lath martensite is typically tempered to improve the balance of strength and toughness for practical applications [8]. The residual stresses and the dislocation density of lath martensite induced by the shearing process can be decreased by tempering, leading to excellent strength-toughness combinations [9,10].…”

Section: Introductionsmentioning

confidence: 99%

Significant Efficiency Improvement of Conventional Tempering by a Novel Flash Tempering Technique

Ding

Niu

Wang

et al. 2023

Preprint

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Effects of Solute Carbon on the Work Hardening Behavior of Lath Martensite in Low-Carbon Steel

Cited by 16 publications

References 26 publications

A numerical study on the effects of DP steel microstructure on the yield locus and the stress–strain response under strain path change

A numerical study on the effects of DP steel microstructure on the yield locus and the stress–strain response under strain path change

A new preparation technology of structural-gradient materials without a brittle transition zone in a Mn-Si-Cr-B bainitic cast steel

Significant Efficiency Improvement of Conventional Tempering by a Novel Flash Tempering Technique

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