Hot compression deformation and constitutive modeling of GH4698 alloy

Zhang, Peng; Hu, Chao; Zhu, Qiang; Ding, Chaogang; Qin, Heyong

doi:10.1016/j.matdes.2014.08.045

Cited by 65 publications

(19 citation statements)

References 29 publications

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“…This is because at a faster strain rate, it was more difficult for the dynamic recovery to fully occur, leading to a higher average dislocation density and a greater deformation resistance. It is worth noting that the peak flow stress shown in Figure 2 agreed well with the results of Zhang et al [22], but the curve shapes were different, which may be attributed to differences in the composition of as-received material. As mentioned in Section 2.1, the carbon content of the material used in this research, 0.08%, was obviously higher than that in the literature [22], 0.048%.…”

Section: Flow Behaviorssupporting

confidence: 85%

“…It is worth noting that the peak flow stress shown in Figure 2 agreed well with the results of Zhang et al [22], but the curve shapes were different, which may be attributed to differences in the composition of as-received material. As mentioned in Section 2.1, the carbon content of the material used in this research, 0.08%, was obviously higher than that in the literature [22], 0.048%. For nickel-based alloys, Chen et al [4] and Lin et al [7] proved that dynamic recrystallization occurred during hot compressions.…”

Section: Flow Behaviorssupporting

confidence: 85%

“…It was shown by the result of Chen et al [4] that the optimal hot working parameters of GH4169 were located at areas whose dissipative efficiencies were 30-35%. Specifically, for the GH4698 alloy, the flow behaviors were investigated by Zhang et al [22], and a flow stress model was established. Nevertheless, hot working maps of GH4698 have not been established, forming a barrier for hot working parameter optimization in large forging production.…”

Section: Introductionmentioning

confidence: 99%

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Flow Behavior and Hot Processing Map of GH4698 for Isothermal Compression Process

et al. 2019

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An in-depth understanding of the flow behaviors of materials deformed at high temperatures is of paramount significance. However, insufficient research on the nickel-based GH4698 alloy has resulted in inaccurate material flow prediction or even cracking in the practical billet opening of GH4698 large forgings. In this study, hot compressions were performed at 950–1150 °C and 0.001–3 s−1. Single-peaked strain-stress curves were obtained under various conditions, owing to dislocation motions in dynamic recrystallizations. The Arrhenius model was formulated to accurately describe the flow stress evolutions and the mean prediction error of the flow stress was 5.90%. Processing maps were constructed at various hot working conditions. It was found that the hot working ability of GH4698 markedly decreased under lower temperatures (950–1080 °C) and higher strain rates (0.1–3 s−1). Optimal thermal processing parameters were suggested. In sum, this study systematically investigated the flow behaviors and hot working ability of GH4698 in isothermal compressions.

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Section: Flow Behaviorssupporting

confidence: 85%

Section: Flow Behaviorssupporting

confidence: 85%

Section: Introductionmentioning

confidence: 99%

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Flow Behavior and Hot Processing Map of GH4698 for Isothermal Compression Process

et al. 2019

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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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“…Constitutive equation was used to analyze plastic flow behavior of hot deformed steels, which could be expressed in terms of Arrhenius equation [9,18]. In the present work, this equation was used to identify hot deformation activation energy and material constants from 0.05-0.69 true strain of hot deformed metal.…”

Section: Constitutive Equation Analysismentioning

confidence: 99%

Critical condition parameters and kinetics of dynamic recrystallization for hot deformed 1 wt%Cr-1 wt%Mo rotor steel

Kumar

Nath

2020

Mater. Res. Express

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Isothermal hot compression tests of low alloy 1 wt%Cr-1 wt%Mo medium carbon rotor steel were carried out over the temperature range from 850°C-1050°C under three strain rates e ( )  varying from 0.001 s −1 -0.1 .1 s −1 . The hot deformation behavior, activation energy and material constants were determined by constitutive analysis. Onset of critical condition parameters for dynamic recrystallization (DRX) of the present steel were determined with the help of mathematical models developed by Poliak and Jonas. DRX kinetics were studied to determine the fraction of dynamic recrystallization with the help of Avrami type model. Also, the values of Avrami power exponent n ( ) and material constant K ( )were calculated for Avrami equation in each deformation condition. Optical and scanning electron (SEM) micrographs of the as-received and the deformed specimens were analyzed to understand the flow stress behavior of this steel.

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Hot compression deformation and constitutive modeling of GH4698 alloy

Cited by 65 publications

References 29 publications

Flow Behavior and Hot Processing Map of GH4698 for Isothermal Compression Process

Flow Behavior and Hot Processing Map of GH4698 for Isothermal Compression Process

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

Critical condition parameters and kinetics of dynamic recrystallization for hot deformed 1 wt%Cr-1 wt%Mo rotor steel

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