Prediction of the critical conditions for dynamic recrystallization in the austenitic steel 800H

Gottstein, Günter; Frommert, M.; Goerdeler, M.; Schäfer, Norbert

doi:10.1016/j.msea.2004.02.098

Cited by 81 publications

(29 citation statements)

References 17 publications

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“…The plots of θ~σ all show a turning point on the DRX softening stage, whether or not the stress peak appeared, as shown in Figure 7 [24]. Figure 7 illustrates work hardening rate versus flow stress variation.…”

Section: Determination Of the Critical Strainmentioning

confidence: 85%

“…According to the above method, the critical stress and corresponding critical strain can be obtained under other temperatures and strain rates. Generally, the critical strain model of the DRX can be written in the following form [24]:…”

Section: Determination Of the Critical Strainmentioning

confidence: 99%

“…In order to determine the unknown parameters of the Equations (14) Generally, the critical strain model of the DRX can be written in the following form [24]:…”

Section: Determination Of the Critical Strainmentioning

confidence: 99%

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Constitutive Model Based on Dynamic Recrystallization Behavior during Thermal Deformation of a Nickel-Based Superalloy

Zhang

Chen

et al. 2016

Metals

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Abstract:The thermal deformation and dynamic recrystallization (DRX) behavior of a nickel-based superalloy were investigated by the thermal compression test. The experimental results show that the process parameters have great influence on the flow stress of the superalloy. In addition, there is an inflection point on the DRX softening stage of the work-hardening rate versus stress curve. DRX under the conditions of higher temperatures and lower strain rates easily occurs when the strain reaches a critical level. Based on the classical dislocation density theory and the DRX kinetics models, a two-stage constitutive model considering the effect of work hardening-dynamic recovery and DRX is developed for the superalloy. Comparisons between the predicted and experimental data indicate that the values predicted by the proposed constitutive model are in good agreement with the experimental results.

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Section: Determination Of the Critical Strainmentioning

confidence: 85%

Section: Determination Of the Critical Strainmentioning

confidence: 99%

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Constitutive Model Based on Dynamic Recrystallization Behavior during Thermal Deformation of a Nickel-Based Superalloy

Zhang

Chen

et al. 2016

Metals

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“…Obtaining this point of inflection requires introduction of a stage V which can only be brought about by a change in microstructural mechanisms. Gottstein [17] proposes to associate this change with the mobility of sub-boundaries.…”

Section: Work Hardening Phenomenonmentioning

confidence: 99%

“…This introduces a new dynamic recovery mechanism and, compared to stage IV behavior, speeds up attainment of a steady-state with a dynamically stable and equiaxed sub grain structure. Also, it generates a stage V of the hardening behavior as a rapid transition to steady-state [17,21]. In …”

Section: Work Hardening Phenomenonmentioning

confidence: 99%

Critical Condition of Dynamic Recrystallization in 35CrMo Steel

Huang

Wang

Xiao

et al. 2017

Metals

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Abstract:The compression deformation behaviors of 35CrMo steel at different conditions was studied by using Gleeble-3810 thermo-simulation machine under large strain. The results indicate that the flow stress curves of 35CrMo steel is affected by strain rate and deformation temperature, showing the characteristics of dynamic recovery (DRV) and dynamic recrystallization (DRX), which is the main softening mechanism of 35CrMo steel. The activation energy (Q) and Zener-Hollomon parameter (Z parameter) expression for thermal deformation of this steel was calculated by linear regression. The inflection point on the curve of strain hardening rate and flow stress (θ-σ curve) corresponds to the beginning of DRX, and the critical strain of DRX increases with the decrease of deformation temperature and the increase of strain rate. Based on the inflection point criterion, the constitutive equation of the critical strain of DRX of 35CrMo steel was established: ε c = 0.000232Z 0.1673 , which reflects the variation of the critical strain of DRX with the Z parameter. In addition, through metallographic observation, the rationality of the inflection point criterion in determining the critical strain of DRX of 35CrMo steel was verified, and the DRX state diagram was established.

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Modeling the Flow Behavior of a High‐Manganese Steel Fe‐Mn23‐C0.6 in Consideration of Dynamic Recrystallization

Xiong

Wietbrock

Saeed-Akbari

et al. 2011

steel research int.

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In this paper, the hot deformation behavior of a high manganese (23wt. % Mn and 0.6wt. % C) austenitic steel is analyzed. This steel is a ternary Fe-Mn-C alloy that shows twinning induced plasticity (TWIP). Since strip production involves hot rolling, the hot deformation behavior of this steel is analyzed and modeled by a phenomenological material model. The model takes into account strain hardening and softening by dynamic recrystallization (DRX), which is modeled using Avrami type kinetics. The evolution of grain size during DRX is also taken into account. Hot compression tests were performed in a temperature range of 900 to 1200 8C and various strain rates from 0.1 s À1 to 10 s À1 to identify the model parameters. The material model was coupled with a finite element code and validated using selected parameter combinations of the compression tests that were not used for parameter identification.

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Prediction of the critical conditions for dynamic recrystallization in the austenitic steel 800H

Cited by 81 publications

References 17 publications

Constitutive Model Based on Dynamic Recrystallization Behavior during Thermal Deformation of a Nickel-Based Superalloy

Constitutive Model Based on Dynamic Recrystallization Behavior during Thermal Deformation of a Nickel-Based Superalloy

Critical Condition of Dynamic Recrystallization in 35CrMo Steel

Modeling the Flow Behavior of a High‐Manganese Steel Fe‐Mn23‐C0.6 in Consideration of Dynamic Recrystallization

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