Study on the dynamic recrystallization mechanisms of Inconel 740 superalloy during hot deformation

Wang, M.J.; Sun, Chaoyang; Fu, Ming; Liu, Zhuofan; Qian, Lingyun

doi:10.1016/j.jallcom.2019.153325

Cited by 97 publications

(32 citation statements)

References 56 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…It is easily found that the average misorientation angles at 1030, 1090, and 1150 °C can be identified as 26.58°, 35.27° and 40.32°, respectively. The evolution characteristic of the average misorientation angle is quite similar to that of Inconel 740 superalloy reported by Wang et al, [ 38 ] which indicates that the fraction of DRX increases gradually with the increasing deformation temperature. Apparently, the fraction of high angle grain boundaries (HAGBs, >15°) increases as the deformation temperature increasing.…”

Section: Resultssupporting

confidence: 83%

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

Jia

et al. 2020

Adv Eng Mater

View full text Add to dashboard Cite

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.

show abstract

Section: Resultssupporting

confidence: 83%

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

Jia

et al. 2020

Adv Eng Mater

View full text Add to dashboard Cite

show abstract

“…The grain sizes under the holding temperatures of 1413 K, 1443 K, and 1473 K were 160 µm, 238 µm, and 299 µm, respectively. The movement of grain boundaries is a thermally activated process [34,35]. This makes the grain structure coarsen faster at higher holding temperatures.…”

Section: Resultsmentioning

confidence: 99%

Study of Grain Growth in a Ni-Based Superalloy by Experiments and Cellular Automaton Model

Liu

et al. 2021

Materials

View full text Add to dashboard Cite

The grain growth behavior in a typical Ni-based superalloy was investigated using isothermal heat treatment experiments over a holding temperature range of 1353–1473 K. The experimental results showed that the grain structure continuously coarsened as the holding time and holding temperature increased during heat treatment. A classical parabolic grain growth model was used to explore the mechanism of grain growth under experimental conditions. The grain growth exponent was found to be slightly above 2. This indicates that the current grain growth in the studied superalloy is mainly governed by grain boundary migration with a minor pinning effect from the precipitates. Then, the grain growth in the studied superalloy during isothermal heat treatment was modelled by a cellular automaton (CA) with deterministic state switch rules. The microscale kinetics of grain growth is described by the correlation between the moving velocity and curvature of the grain boundary. The local grain boundary curvature is well evaluated by a template disk method. The grain boundary mobility was found to increase with increasing temperature. The relationship between the grain boundary mobility and temperature has been established. The developed CA model is capable of capturing the dependence of the grain size on the holding time under different holding temperatures.

show abstract

“…Obviously, the average misorientation angle dose not vary monotonically as the true strain increasing. The evolution characteristic of the average misorientation angle is considered to be associated with the DRX grain growth and volume fraction [ 31 ]. This demonstrates the occurrence of the next round of the DRX process when the true strain increases to 0.7.…”

Section: Resultsmentioning

confidence: 99%

Investigation on Sub-Solvus Recrystallization Mechanisms in an Advanced γ-γ’ Nickel-Based Superalloy GH4151

Chen

et al. 2020

Materials

View full text Add to dashboard Cite

Sub-solvus dynamic recrystallization (DRX) mechanisms in an advanced γ-γ’ nickel-based superalloy GH4151 were investigated by isothermal compression experiments at 1040 °C with a strain rate of 0.1 s−1 and various true strain of 0.1, 0.3, 0.5, and 0.7, respectively. This has not been reported in literature before. The electron backscatter diffraction (EBSD) and transmission electron microscope (TEM) technology were used for the observation of microstructure evolution and the confirmation of DRX mechanisms. The results indicate that a new dynamic recrystallization mechanism occurs during hot deformation of the hot-extruded GH4151 alloy. The nucleation mechanism can be described as such a feature, that is a primary γ’ (Ni3(Al, Ti, Nb)) precipitate embedded in a recrystallized grain existed the same crystallographic orientation, which is defined as heteroepitaxial dynamic recrystallization (HDRX). Meanwhile, the conventional DRX mechanisms, such as the discontinuous dynamic recrystallization (DDRX) characterized by bulging grain boundary and continuous dynamic recrystallization (CDRX) operated through progressive sub-grain merging and rotation, also take place during the hot deformation of the hot-extruded GH4151 alloy. In addition, the step-shaped structures can be observed at grain boundaries, which ensure the low-energy surface state during the DRX process.

show abstract

Study on the dynamic recrystallization mechanisms of Inconel 740 superalloy during hot deformation

Cited by 97 publications

References 56 publications

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

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

Study of Grain Growth in a Ni-Based Superalloy by Experiments and Cellular Automaton Model

Investigation on Sub-Solvus Recrystallization Mechanisms in an Advanced γ-γ’ Nickel-Based Superalloy GH4151

Contact Info

Product

Resources

About