A physically-based constitutive model for a nitrogen alloyed ultralow carbon stainless steel

He, Anrui; Xie, Ganlin; Yang, Xiaoya; Wang, Xitao; Zhang, Hailong

doi:10.1016/j.commatsci.2014.10.044

Cited by 60 publications

(17 citation statements)

References 16 publications

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“…Furthermore, an appropriate constitutive model also extremely significant for designers to understand the flow behaviors of alloys at high temperature, which determines the parameters of hot deformation process. As an important tool, constitutive models are also used to describe how flow behavior responds to the deformation conditions [1][2][3][4][5].…”

Section: Introductionmentioning

confidence: 99%

Hot compression deformation behavior and a modified physically-based constitutive model of Cu-6 %Ag alloy

et al. 2016

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In order to reveal the flow characteristics of Cu-6 %Ag alloy on the condition of hot deformation, the isothermal compression experiments are carried out at the temperatures of 973-1123 K under strain rates of 0.01-10 s -1 . The effects of deformation condition on the hot compression deformation behavior are investigated. The low instability strain (e i ) behavior at high strain rate (10 s -1 ) is discussed in this paper. According to the experiment results and analyses, the deformation twinning and inhomogeneous grains are thought to be the possible reasons for low strain cracking. Then, a modified physically based constitutive model is established. The strain for maximum softening rate ðe Ã Þ is quoted in the constitutive equation which is proved that there is a nearly linear relationship between lne Ã and lnZ. What's more, the correlation coefficient (R) and the average absolute relative error (AARE) are used to evaluate the accuracy of the established constitutive model. The values of R and AARE are 0.99612 and 3.47 %, respectively, which show that the modified constitutive model can exactly reveal the flow stress of Cu-6 %Ag alloy.

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Section: Introductionmentioning

confidence: 99%

Hot compression deformation behavior and a modified physically-based constitutive model of Cu-6 %Ag alloy

et al. 2016

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“…2, when the deformation temperature is fixed, the flow stress increases with increasing strain rate; when the strain rate is fixed, the flow stress increases with decreasing temperature. 13 The constitutive models are often used to predict the strain-stress relationship of metallic materials during deformation, and can be used in FEM software to simulate mechanical response of material under prevailing loading conditions. [14][15][16][17][18][19] According to the microstructure evolution mechanism during hot deformation, the true strain-true stress curves can be divided into two stages: first, work hardening and dynamic recovery stage and second, dynamic recrystallisation stage.…”

Section: Materials Model Used In Finite Element Analysis Constitutive mentioning

confidence: 99%

Finite element analysis and experimental study of microstructure evolution of nitrogen alloyed ultralow carbon stainless steel during hot deformation

Yang

Xie

et al. 2014

Materials at High Temperatures

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Hot compression experiments of a nitrogen alloyed ultralow carbon stainless steel were performed in the temperature range of 1223-1423 K, at strain rates of 0?001-1 s 21 , and with deformation amounts of 30-70% on a Gleeble-3500 thermal-simulator. Based on the results from thermo-physical simulation experiments and metallographic analyses, a physically-based constitutive model and a dynamic recrystallisation (DRX) model of the studied steel were derived, and the developed models were further embedded into a finite element method (FEM) software. The microstructure evolution of the studied steel under various hot deformation conditions was simulated by FEM, and the effects of deformation amount, strain rate and temperature on the microstructure evolution were clarified. The results obtained from the finite element analysis were verified by the experiments. The finding confirms that the thermalmechanical FEM coupled with the developed constitutive model and DRX model can be used to accurately predict the microstructure evolution of the studied steel during hot deformation.

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“…The relationship between dθ/dσ and σ can be obtained from Equation (13). When Equation (13) has a maximum value, the corresponding stress in the highest point of the Figure 9 is the critical stress, and σc = 762.4 MPa is obtained.…”

Section: Determination Of the Critical Strainmentioning

confidence: 99%

“…Figure 11 is a general schematic of stress-strain curves during the occurrence of recrystallization and the only occurrence of recovery in the deformation process of alloy [12]. In what follows, the constitutive model of flow stress for the nickel-based superalloy will be divided into two parts [13,14] Considering the work hardening and DRV, the evolution of the dislocation density with strain is generally controlled by the competition between the multiplication and annihilation of dislocation, and the dislocation density are depended on strain, which can be expressed by [ Figure 11. Schematic of stress-strain curves.…”

Section: Constitutive Model Of Flow Stressmentioning

confidence: 99%

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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A physically-based constitutive model for a nitrogen alloyed ultralow carbon stainless steel

Cited by 60 publications

References 16 publications

Hot compression deformation behavior and a modified physically-based constitutive model of Cu-6 %Ag alloy

Hot compression deformation behavior and a modified physically-based constitutive model of Cu-6 %Ag alloy

Finite element analysis and experimental study of microstructure evolution of nitrogen alloyed ultralow carbon stainless steel during hot deformation

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

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