Thermal deformation and dynamic recrystallization of a novel HEXed P/M nickel-based superalloy

Li, Huizhong; Yang, Lei; Wang, Yan; Tan, Gang; Qiao, Shi-chang; Huang, Zhengqin; Liu, Min-xue

doi:10.1016/j.matchar.2020.110285

Cited by 28 publications

(5 citation statements)

References 44 publications

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“…It is also observed that the work hardening rate θ decreases quickly to zero, and corresponding peak stress σ p is shown in this curve. Then the θ returns to zero and fluctuates around zero, which indicates that the dynamic softening mechanisms are principally characterised by CDRX at the single pass deformation [23,24]. For common metal materials, the critical strain is 80% of the peak strain (0.08 in this study).…”

Section: Resultsmentioning

confidence: 82%

Effect of deformation pass on softening mechanism and microstructure of 7085 alloy

Zhao

Zhang

et al. 2023

Materials Science and Technology

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Thermal deformation plays a key role in improving the comprehensive performance of 7085 aluminium alloy. We simulated the thermal deformation with a Gleeble-3800 thermal simulator under various deformation passes. The results showed that the softening mechanism in every deformation pass is principally recovery, and recrystallisation is relatively low. The sample compression by the single pass deformation at 673 K has the maximum recrystallisation fraction of 27.4%. The recrystallisation fraction of the sample compressed by three passes at 673 K and holding time of 120s reaches 23.2% due to the activation of meta-dynamic recrystallisation. Meanwhile, static recovery is more sufficient and more regular sub-grains (73.8%) are observed. Additionally, multi-pass deformation process is adopted to decrease the texture intensity and grain anisotropy.

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Section: Resultsmentioning

confidence: 82%

Effect of deformation pass on softening mechanism and microstructure of 7085 alloy

Zhao

Zhang

et al. 2023

Materials Science and Technology

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“…The value of Q is within the range of observations of the previous researches such as Inconel 718 (443.2 kJ mol −1 ), [ 30 ] René 41 (598.28 kJ mol −1 ), [ 31 ] Udimet 520 (780 kJ mol −1 ), [ 32 ] FGH100 (866.73 kJ mol −1 ), [ 33 ] PM‐0001(903.58 kJ mol −1 ), [ 34 ] FGH96 (983.6 kJ mol −1 ), [ 35 ] and HEXed P/M nickel‐based superalloy (1175.1 kJ mol −1 ). [ 22 ] The value of Q can be served as an indicator of deformation difficulty degree during plasticity deformation, which was related to many factors, such as chemistry, precipitate, etc. [ 22,34 ] The higher value of Q in GH4065 alloy is mainly related to chemistry and γ′ precipitates.…”

Section: Resultsmentioning

confidence: 99%

“…[22] The value of Q can be served as an indicator of deformation difficulty degree during plasticity deformation, which was related to many factors, such as chemistry, precipitate, etc. [22,34] The higher value of Q in GH4065 alloy is mainly related to chemistry and γ 0 precipitates. On one hand, the Q represents the energy barrier required to overcome for the atomic transition.…”

Section: Arrhenius-type Constitutive Modelingmentioning

confidence: 99%

“…In previous studies, the hot deformation behavior and microstructure evolution of nickel-based superalloys have been done. [15][16][17][18][19][20][21][22] Azarbarmas et al [23] observed the hot deformation characteristics of an IN718 superalloy by isothermal compression experiments, and found that discontinuous dynamic recrystallization (DDRX), characterized by grain boundary bulging, is the dominant nucleation mechanism at small strain. Jiang et al [24] investigated the deformation characteristics of 618B alloy by hot compression tests, and concluded that DDRX is the dominant nucleation mechanism of DRX.…”

Section: Introductionmentioning

confidence: 99%

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Hot Deformation Characteristics and Dynamic Recrystallization Mechanisms of a Novel Nickel‐Based Superalloy

Jia

et al. 2020

Adv Eng Mater

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The hot deformation characteristics of a novel nickel‐based superalloy is investigated via the isothermal compression test in temperature range of 1000–1150 °C and strain rate of 0.001–10 s−1 under the true strain of 0.8. The hot deformation characteristics of GH4065 alloy are studied here for the first time. Based on the flow stress data, it is observed the typical features of flow curves exhibit the occurrence of dynamic recrystallization (DRX) during the hot deformation process. The constitutive equation in the Arrhenius‐type model is established, and activation energy (Q) is determined as 844.787 kJ mol−1. The microstructure evolution and DRX mechanism are investigated by electron backscatter diffraction (EBSD) and transmission electron microscopy (TEM) technique. The results reveal that the fraction of low angle grain boundaries (LAGBs) decrease gradually with the increase in deformation temperature, whereas the fraction of Σ3 boundaries increase first and then decrease. For γ + γ′ dual‐phase region, the particle‐induced DRX (PIDRX), characterized by the generation of sub‐grains accelerated by γ′ precipitates pinning dislocations, and discontinuous dynamic recrystallization (DDRX) are the dominant nucleation mechanism of DRX. For γ quasi‐phase region and γ single‐phase region, the occurrence of bulged grain boundaries with twins further illustrates that DDRX plays a more significant role.

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“…Some scholars have also studied the microstructure evolution and recrystallization behavior of the alloy [ 21 , 22 , 23 ]. By combining T-EBSD with transmission electron microscopy (TEM), Sun Fei [ 24 ] accurately studied the microstructure evolution of recrystallization process of U720Li disc superalloy.…”

Section: Introductionmentioning

confidence: 99%

Thermal Processing Map and Microstructure Evolution of Inconel 625 Alloy Sheet Based on Plane Strain Compression Deformation

Song

Fan

et al. 2021

Materials

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Plane strain compression tests were used to study the deformation behavior of an Inconel 625 alloy sheet at various temperatures and strain rates. The peak stress was selected to establish the constitutive equation, and the processing maps under different strains were drawn. The results show that the effective stress–strain curve of Inconel 625 has typical dynamic recrystallization (DRX) characteristics. With the increasing deformation temperature and the decreasing strain rate, the softening effect is significantly enhanced. The parameters of the constitutive equation are calculated, and the average error of the constitutive equation is 5.68%. Through the analysis of the processing map, a deformation temperature of 950–960 °C with a strain rate of 0.007–0.05 s−1 were determined as the unstable region, and obvious local plastic-rheological zones were found in the unstable region. The optimum deformation condition was found to be 1020–1060 °C/0.005–0.03 s−1. Through electron backscattered diffraction (EBSD) characterization, it was found that both the increase of temperature and the decrease of strain rate significantly promote the recrystallization process. At a low strain rate, the main recrystallization mechanism is discontinuous dynamic recrystallization (DDRX). It is expected that the above results can provide references for the optimization of the rolling process and microstructure control of an Inconel 625 alloy sheet.

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Thermal deformation and dynamic recrystallization of a novel HEXed P/M nickel-based superalloy

Cited by 28 publications

References 44 publications

Effect of deformation pass on softening mechanism and microstructure of 7085 alloy

Effect of deformation pass on softening mechanism and microstructure of 7085 alloy

Hot Deformation Characteristics and Dynamic Recrystallization Mechanisms of a Novel Nickel‐Based Superalloy

Thermal Processing Map and Microstructure Evolution of Inconel 625 Alloy Sheet Based on Plane Strain Compression Deformation

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