Hot deformation behavior and DRX mechanism in a γ-γ/ cobalt-based superalloy

Sani, Saeed Aliakbari; Arabi, H.; Ebrahimi, Ghanbar

doi:10.1016/j.msea.2019.138165

Cited by 35 publications

(11 citation statements)

References 56 publications

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“…As strain increases, stress first increases and then decreases, where the increase is due to severe work hardening cause by high dislocation density in the initial stage of deformation, whereas the decrease is due to the softening caused by the DRX process. As shown in Figure , the stress level in the high temperature and low strain rate regime is significantly lower than in the low temperature and high strain rate region . High deformation temperature and low strain rate can provide a long enough incubation period for DRX and enhance the nucleation and growth of recrystallized grains .…”

Section: Resultsmentioning

confidence: 95%

“…As shown in Figure a, many tiny DRX grains are interspersed with some bulged GBs. The bulging GBs usually possess high local orientation or strain gradients, and, thus, are potential sites for DDRX nucleation . The maximum grain size in this area is about 105 μm, which is defined by the area of the largest grain, and the grain orientation is nearly random .…”

Section: Resultsmentioning

confidence: 99%

“…As shown in Figure 2, the stress level in the high temperature and low strain rate regime is significantly lower than in the low temperature and high strain rate region. [11] High deformation temperature and low strain rate can provide a long enough incubation period for DRX and enhance the nucleation and growth of recrystallized grains. [51] In addition, at strain rates of 10 and 1 s À1 , there is a sharper drop in the flow stress after the peak point than with any other condition, as shown in Figure 2a.…”

Section: Flow Behaviors and Adiabatic Heating Effectmentioning

confidence: 99%

“…Some reports have been conducted on the mechanisms of DRX, where two mechanisms are generally accepted: discontinuous dynamic recrystallization (DDRX) and continuous dynamic recrystallization (CDRX). [10][11][12][13][14][15] Previous research [16][17][18][19][20][21][22] demonstrated that DDRX via grain boundary (GB) bulging dominates the DRX process during the deformation of several nickel-based superalloys, such as Allvac 718Plus, Udimet 720Li, FGH4096, Inconel 718, and so on. DDRX strongly depends on preexisting GBs, which are potential nucleation sites of DDRX.…”

Section: Introductionmentioning

confidence: 99%

“…Reports on the DRX behavior of superalloys have been studied in detail. Some reports have been conducted on the mechanisms of DRX, where two mechanisms are generally accepted: discontinuous dynamic recrystallization (DDRX) and continuous dynamic recrystallization (CDRX) . Previous research demonstrated that DDRX via grain boundary (GB) bulging dominates the DRX process during the deformation of several nickel‐based superalloys, such as Allvac 718Plus, Udimet 720Li, FGH4096, Inconel 718, and so on.…”

Section: Introductionmentioning

confidence: 99%

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A Mechanism for the Evolution of Hot Compression Cracking in Inconel 625 Alloy Ingot With Respect to Grain Growth

Jia

Gao

Ji³

2020

Adv Eng Mater

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Hot compression cracking of as‐cast Inconel 625 alloy is investigated utilizing high temperature and high strain rate compression tests. The formation mechanism of the hot crack is systematically investigated based on grain growth and crystal slipping. Scanning electron microscopy (SEM) and electron backscattered diffraction (EBSD) analysis are used to characterize the crack morphology and microstructure. SEM results showed that the hot cracking during hot compression of Inconel 625 alloy is determined to be quasi‐cleavage fracture. The formation of carbide (NbC) plays a key role in the formation and propagation of the hot crack. The various slip systems activation strongly contributes to the overall growth of the dynamic recrystallization (DRX) grains. In addition, subgranular boundary formation within the grown grains is attribution to various slip systems activation in different local regions. The initiation and propagation of the hot compression cracks in Inconel 625 alloy depend on the development of the subgranular boundary within the grown grain.

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Section: Resultsmentioning

confidence: 95%

Section: Resultsmentioning

confidence: 99%

Section: Flow Behaviors and Adiabatic Heating Effectmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

A Mechanism for the Evolution of Hot Compression Cracking in Inconel 625 Alloy Ingot With Respect to Grain Growth

Jia

Gao

Ji³

2020

Adv Eng Mater

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Dynamic Softening Mechanism and an Improved Unified Constitutive Model for an Al–Cu–Mn–Fe–Zr Alloy during Warm Deformation

et al. 2021

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Deformation behavior of an Al–Cu–Mn–Fe–Zr alloy is investigated by plane strain compression tests at a warm deformation region. The flow stress first increases and then keeps steady, and the flow stress increases with reducing temperature or raising strain rate. However, the influence of strain rate on flow stress is weak at 100 and 150 °C. The dynamic recovery (DRV) mechanism is the dominant mechanism to balance the work hardening, and a larger number of dislocations are consumed at low strain rates. So, the deformed grains are difficult to reach the critical strain for dynamic recrystallization (DRX). When the strain rate is relatively high, the critical strain can be reached in a short time, which promotes the process of DRX. In addition, an improved unified constitutive model is built based on the evolution of dislocation density. The predicted flow stresses are in a close agreement with the measured results, proving that the built model can nicely reproduce the flow behavior.

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Hot deformation behavior and dynamic recrystallization of Ti−3Mo−6Cr−3Al−3Sn titanium alloy

Liu,

Zhang,

Wang

et al. 2024

Materialwissenschaft Werkst

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The hot compression experiments were performed at a deformation temperature of 720 °C to 870 °C and a strain rate of 0.0005 s−1 to 5 s−1. The strain‐compensated Arrhenius constitutive equation and the hot processing map at a strain of 0.6 were established, and the dynamic recrystallization behaviors of the alloy in different power dissipation (η) regions were studied. The results show that the correlation coefficient (R) and average relative errors (AARE) of the established constitutive equations are 0.999 % and 2.523 % in the β phase region, and 0.988 % and 7.709 % in the α+β phase region, respectively. The hot processing map shows that the deformation parameters in the high power dissipation regions range from 810 °C to 870 °C/0.0005 s−1 to 0.005 s−1, accompanied by a power dissipation factor of 0.41 to 0.55. These regions result from a combination of continuous and discontinuous recrystallization mechanisms. With the decrease in the power dissipation value, the appearance of deformation bands (DBs) and localized flow (FL) in the microstructure increased.

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Hot deformation behavior and DRX mechanism in a γ-γ/ cobalt-based superalloy

Cited by 35 publications

References 56 publications

A Mechanism for the Evolution of Hot Compression Cracking in Inconel 625 Alloy Ingot With Respect to Grain Growth

A Mechanism for the Evolution of Hot Compression Cracking in Inconel 625 Alloy Ingot With Respect to Grain Growth

Dynamic Softening Mechanism and an Improved Unified Constitutive Model for an Al–Cu–Mn–Fe–Zr Alloy during Warm Deformation

Hot deformation behavior and dynamic recrystallization of Ti−3Mo−6Cr−3Al−3Sn titanium alloy

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