Investigation on micromechanism of ferrite hardening after pre-straining with different strain rates of dual-phase steel

Chen, Yongnan; Wu, Zhigang; Wu, Gang; Wang, Nan; Zhao, Qinyang; Luo, Jun

doi:10.1016/j.msea.2020.140657

Cited by 22 publications

(5 citation statements)

References 36 publications

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“…Apparently, the deflections occur when the crack encounters GBs, due to the misalignment of slip systems between neighboring grains for both LR and RL specimens. 47 Kernel average misorientation (KAM) maps are performed on the same area, which could be used to analyze the localized strain 48 in Figure 8B,D. The results are consistent with the records from the replicas that show large amounts of localized strain bands are emerging from the main crack for the LR specimen.…”

Section: The Effects Of Microstructural Features On Crack Propagation...supporting

confidence: 70%

The behavior of anisotropic fatigue short crack initiation and propagation for a directionally solidified superalloy CM247LC at room temperature

Tan

Octaviani

Gao

et al. 2023

Fatigue Fract Eng Mat Struct

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The effects of mechanical and microstructural anisotropy on short fatigue crack initiation and propagation behaviors of a directionally solidified superalloy have been studied. An unusual result was found where the fatigue lives of specimens with grains longitudinally aligned along the loading direction fail at lower lifetimes than specimens with transversely loaded grains when the applied stress is close to the yield stress. This is mainly attributed to the lower Young's modulus of the longitudinal specimen, which induces more local plastic strain (at stress concentration features) leading to earlier crack initiation and faster crack propagation under the applied test stress.

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Section: The Effects Of Microstructural Features On Crack Propagation...supporting

confidence: 70%

The behavior of anisotropic fatigue short crack initiation and propagation for a directionally solidified superalloy CM247LC at room temperature

Tan

Octaviani

Gao

et al. 2023

Fatigue Fract Eng Mat Struct

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show abstract

“…The excellent properties of dual-phase (DP) steels, including high ultimate tensile strengths, reasonable elongation, continuous yielding, acceptable strain hardening, and good weldability and formability, have resulted in their increasing demand. [1][2][3] These steels contain the soft phase of ferrite and the hard phase of martensite. In this regard, several researches have been conducted to study the effect of volume fraction, morphology, and the carbon content of each phase, [4][5][6] which, in turn, depend on the initial microstructure and heat treatment parameters, including heating/cooling rate and annealing time and temperature.…”

Section: Introductionmentioning

confidence: 99%

Micromechanical Modeling of Strain‐Hardening Behavior in Dual‐Phase Steels

Rezayat

Rahron

Allafi

2023

steel research int.

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A mathematical model is developed to consider the impact of microstructural parameters, including the volume fraction and the average particle size of martensite, on the flow stress and strain‐hardening behavior of dual‐phase microstructure. In this regard, the micromechanical approach is applied for partitioning the stress and strain in ferrite and martensite. Martensite carbon content and geometrically necessary dislocations, generated from austenite‐to‐martensite transformation, and strain accommodation at the ferrite–martensite interface, are involved to modify the partitioned stress of martensite and ferrite, respectively. Having partitioned stress in each phase, the global stress is estimated as the function of steel chemical composition, ferrite grain size, martensite particle size, aspect ratio, and volume fraction. To evaluate the applicability of the proposed model, four dual‐phase steels containing 12, 25, 34, and 48% volume fractions of martensite are prepared from the intermediate quenching process, and then after the strain‐hardening stages are investigated. Comparing the experimental result and model output reveals that the presented model shows good predictive capabilities to identify strain‐hardening stages and estimate the inverse of the strain‐hardening exponent.

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“…Chen has studied the hardening mechanism of dual-phase steel at different strain rates and found that with the increase in strain rate, GNDs and LAGBs in ferrite increase, and the average KAM value and nano-hardness increase, correspondingly. Moreover, strain localisation has been observed in ferrite grains at low strain rate, while considerable strain localisation appeared at ferrite/bainite (F/B) interfaces at high strain rate [16]. The research shows that it is of great significance to study the fracture mechanism of dual-phase steel at different tensile rates.…”

Section: Introductionmentioning

confidence: 99%

Study on uniaxial tensile deformation of bainite/ferrite dual phase steel

Liu

Long

et al. 2023

Materials Science and Technology

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The microstructure evolution of a ferrite/bainite dual-phase steel during uniaxial tension was observed in-situ technology. The effects of tensile rates on microstructure, mechanical properties and fracture mechanism were studied. The result shows that stress concentration is easy to form cracks at the interfaces between ferrite and bainite. The sample exhibits high uniform elongation and strength at low-strain rate, which is attributed to the effective interaction between dislocations. The microstructure undergoes orderly and continuous high hardening rate under ‘harmonious’ conditions. Dislocations are rapidly entangled at high-strain rate and dislocation cells forms. The increased strength of the ferrite brings a reduction in its ability to coordinate more plastic deformation, which eventually leads to local plastic instability and early fracture.

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Investigation on micromechanism of ferrite hardening after pre-straining with different strain rates of dual-phase steel

Cited by 22 publications

References 36 publications

The behavior of anisotropic fatigue short crack initiation and propagation for a directionally solidified superalloy CM247LC at room temperature

The behavior of anisotropic fatigue short crack initiation and propagation for a directionally solidified superalloy CM247LC at room temperature

Micromechanical Modeling of Strain‐Hardening Behavior in Dual‐Phase Steels

Study on uniaxial tensile deformation of bainite/ferrite dual phase steel

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