Comparison Study of Hot Deformation Behavior and Microstructure Evolution of Rack Steels with and without Segregation

Wang, Qinghai; Ye, Qibin; Kan, Liye; Wang, Hongtao; Li, Geng; Tian, Yong; Wang, Zhaodong

doi:10.1002/srin.202200246

Cited by 2 publications

(2 citation statements)

References 32 publications

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“…Thus, The KAM maps can intuitively suggest the deformation energy. [37] Figure 9a-c showed the KAM value under different deformation conditions. The high KAM value at a temperature of 880 °C and a strain rate of 0.1 s À1 indicated that severe plastic deformation occurred within the crystal, leading to large lattice distortions and complex dislocation motions.…”

Section: Microstructure Observation Of Stable Regionsmentioning

confidence: 99%

Constitutive Modeling for Flow Stress and Processing Maps of a 0.2C–2.0Mn–0.5Cr Microalloyed Steel

Feng,

Zhang,

Zhang

et al. 2023

steel research int.

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Low‐carbon microalloyed steel with the microstructure of bainite is frequently utilized to produce automotive parts. The systematic investigation of the hot deformation behavior can serve as a reference for the optimization of deformation process parameters. The hot deformation of 0.2C–2.0Mn–0.5Cr microalloyed steel is studied. Based on the stress–strain curve, an Arrhenius model with strain compensation is established. The correlation coefficient R2 and the average absolute relative error calculated according to this model are 0.962 and 4.871%. The microstructure evolution at the strain of 0.90 is studied. In the stable region with substantial power dissipation, the microstructure is uniformly fine. The strain rate is high in the stable region with low‐power dissipation, and the room‐temperature microstructure after deformation retains a large amount of deformation storage energy and fine substructures. During deformation, the banded structures are formed in the instable region. The difference in dislocation density between the band structure and the nearby regions promotes the formation of necklace microstructures. Therefore, the 0.2C–2.0Mn–0.5Cr microalloyed steel has an ideal deformation process window in the range of a hot deformation temperature of 880–920 °C and a strain rate of 0.1–0.3 s−1.

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Section: Microstructure Observation Of Stable Regionsmentioning

confidence: 99%

Constitutive Modeling for Flow Stress and Processing Maps of a 0.2C–2.0Mn–0.5Cr Microalloyed Steel

Feng,

Zhang,

Zhang

et al. 2023

steel research int.

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show abstract

“…The Arrhenius model [10] and the Johnson-Cook (J-C) model [11] are two widely used phenomenological models, which have been successfully used to predict the flow behavior of a variety of materials. [12][13][14] However, these models are of little metallurgical significance and cannot reflect the evolution of microstructure. Therefore, different types of physical constitutive models have been proposed, including Zerilli-Armstrong (Z-A) model, [15] model based on dynamic recovery (DRV) and DRX mechanisms, [16,17] model based on dislocation mechanism, [18] and so on; these physical models are proposed with consideration of micromechanisms but have a large number of material constants.…”

Section: Introductionmentioning

confidence: 99%

Study on Hot Flow Behaviors and Deformation/Diffusion Mechanisms of V and V–Ti Microalloyed Steels by Physical Constitutive Modeling

Wei

Deng

Chen

et al. 2023

steel research int.

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The hot compression tests of medium carbon V and V–Ti microalloyed steels are carried out at the temperature of 900–1100 °C and strain rate of 0.01–10 s−1. Three physical constitutive models based on creep theory are studied, the prediction accuracy is compared and analyzed by employing the correlation coefficient (R) and average absolute relative error (AARE), and the deformation/diffusion mechanisms are discussed. The results show that Ti has obvious hardening effect in V microalloyed steel and retards the onset of dynamic recrystallization. The physical constitutive model containing the theoretical value of creep exponent 5 can accurately describe the hot flow behavior of both steels, the prediction accuracy of which is comparable to that of the model containing exponent n, reflecting that the dominant deformation mechanism of both steels is dislocation climbing. Furthermore, a modified physical constitutive model combining diffusion mechanisms of lattice diffusion and grain boundary diffusion shows higher accuracy (R = 0.996, AARE = 3.81% of V steel and R = 0.994, AARE = 4.52% of V–Ti steel), indicating that the diffusion mechanism is controlled not only by lattice diffusion but also by grain boundary diffusion.

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Comparison Study of Hot Deformation Behavior and Microstructure Evolution of Rack Steels with and without Segregation

Cited by 2 publications

References 32 publications

Constitutive Modeling for Flow Stress and Processing Maps of a 0.2C–2.0Mn–0.5Cr Microalloyed Steel

Constitutive Modeling for Flow Stress and Processing Maps of a 0.2C–2.0Mn–0.5Cr Microalloyed Steel

Study on Hot Flow Behaviors and Deformation/Diffusion Mechanisms of V and V–Ti Microalloyed Steels by Physical Constitutive Modeling

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