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

Zhang, Peng; Yi, Cen; Chen, Gang; Qin, Heyong; Wang, Chuanjie

doi:10.3390/met6070161

Cited by 40 publications

(17 citation statements)

References 43 publications

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“…The flow behaviors are very complex during hot deformation, and the parameters of hot deformation, such as temperature and strain rate, affect the flow stress significantly. Therefore, the control of deformation parameters is critical in optimizing the final mechanical properties [16][17][18][19][20]. Figure 4 indicates the true representative stress-stain curves of the studied alloy under various deformation conditions.…”

Section: Dynamic Softening Behaviormentioning

confidence: 99%

An Investigation on the Softening Mechanism of 5754 Aluminum Alloy during Multistage Hot Deformation

Deng

Wang

Liu

2017

Metals

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Abstract:Isothermal interrupted hot compression tests of 5754 aluminum were conducted on a Gleeble-3500 thermo-mechanical simulator at temperatures of 350 • C and 450 • C, and strain rates of 0.1 s −1 and 1 s −1 . To investigate the metadynamic recrystallization behavior, a range of inter-pass delay times (5-60 s) was employed. These tests simulated flat rolling to investigate how softening behaviors respond to controlled parameters, such as deformation temperature, strain rate, and delay times. These data allowed the parameters for the hot rolling process to be optimized. The dynamic softening at each pass and the effect of metadynamic recrystallization on flow properties and microstructural evolution were analyzed in detail. An offset yield strength of 0.2% was employed to calculate the softening fraction undergoing metadynamic recrystallization. A kinetic model was developed to describe the metadynamic recrystallization behaviors of the hot-deformed 5754 aluminum alloy. Furthermore, the time constant for 50% recrystallization was expressed as functions related to the temperature and the strain rate. The experimental and calculated results were found to be in close agreement, which verified the developed model.

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Section: Dynamic Softening Behaviormentioning

confidence: 99%

An Investigation on the Softening Mechanism of 5754 Aluminum Alloy during Multistage Hot Deformation

Deng

Wang

Liu

2017

Metals

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show abstract

“…The flow behaviors are very complex during hot deformation, and the parameters of hot deformation, such as temperature and strain rate, affect the flow stress significantly. Therefore, the control of deformation parameters is critical in optimizing the final mechanical properties [16][17][18][19][20]. Figure 2 indicates the true representative stress-stain curves of the studied alloy under various deformation conditions.…”

Section: Dynamic Softening Behaviormentioning

confidence: 99%

Investigation on Softening Mechanism of 5754 Aluminum Alloy during Multistage Hot Deformation

Deng¹,

Wang²,

Liu³

2017

Preprint

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Abstract:Isothermal interrupted hot compression tests of 5754 aluminum were conducted on a Gleeble-3500 thermo-mechanical simulator at temperatures of 350 °C and 450 °C, and strain rates of 0.1 s −1 and 1 s −1 . To investigate the metadynamic recrystallization behavior, a range of inter-pass delay times (5-60 s) was employed. These tests simulated flat rolling to investigate how softening behaviors respond to controlled parameters, such as deformation temperature, strain rate, and delay times. These data allowed the parameters for the hot rolling process to be optimized. The dynamic softening at each pass and the effect of metadynamic recrystallization on flow properties and microstructural evolution were analyzed in detail. An offset yield strength of 0.2% was employed to calculate the softening fraction undergoing metadynamic recrystallization. A kinetic model was developed to describe the metadynamic recrystallization behaviors of the hot-deformed 5754 aluminum alloy. Furthermore, the time constant for 50% recrystallization was expressed as functions related to the temperature and the strain rate. The experimental and calculated results were found to be in close agreement, which verified the developed model.

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“…As shown in Figure 11, the plots of εc-εp and lnεp-lnZ can determine the unknown parameters a and a1 of the Equations (10) and (11) In general, the critical strain model of DRX can be expressed by the following equation [11,24]:…”

Section: Critical Stress For Initiation Of Dynamic Recrystallization mentioning

confidence: 99%

“…As the temperature increases, the internal drive energy becomes larger and the dislocation motion occurs more easily, increasing the likelihood of DRX, so that the critical strain of DRX becomes smaller. In general, the critical strain model of DRX can be expressed by the following equation [11,24]:…”

Section: Critical Stress For Initiation Of Dynamic Recrystallization mentioning

confidence: 99%

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

Cited by 40 publications

References 43 publications

An Investigation on the Softening Mechanism of 5754 Aluminum Alloy during Multistage Hot Deformation

An Investigation on the Softening Mechanism of 5754 Aluminum Alloy during Multistage Hot Deformation

Investigation on Softening Mechanism of 5754 Aluminum Alloy during Multistage Hot Deformation

Critical Condition of Dynamic Recrystallization in 35CrMo Steel

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