Investigation on Dynamic Recrystallization Behavior in Hot Deformed Superalloy Inconel 718

Wang, Y.; Shao, Wen; Zhen, Liang; Li, Lin; Cui, Yan

doi:10.4028/www.scientific.net/msf.546-549.1297

Cited by 12 publications

(6 citation statements)

References 7 publications

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“…In general, the higher the strain rate and lower the temperature, the finer the recrystallized grains, in agreement with the literature for Inconel ® 718 [15]. Annealing twins were observed in all the recrystallized grains, as reported for Inconel ® 718 [48]. The results of the recrystallized grain sizes are shown in Figure 9.…”

Section: Microstructure After Deformation and Damagesupporting

confidence: 90%

Hot Deformation Behavior of a Ni-Based Superalloy with Suppressed Precipitation

Lizzi

Pradeep

Stanojević

et al. 2021

Metals

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Inconel®718 is a well-known nickel-based super-alloy used for high-temperature applications after thermomechanical processes followed by heat treatments. This work describes the evolution of the microstructure and the stresses during hot deformation of a prototype alloy named IN718WP produced by powder metallurgy with similar chemical composition to the matrix of Inconel®718. Compression tests were performed by the thermomechanical simulator Gleeble®3800 in a temperature range from 900 to 1025 °C, and strain rates scaled from 0.001 to 10 s−1. Flow curves of IN718WP showed similar features to those of Inconel®718. The relative stress softening of the IN718WP was comparable to standard alloy Inconel®718 for the highest strain rates. Large stress softening at low strain rates may be related to two phenomena: the fast recrystallization rate, and the coarsening of micropores driven by diffusion. Dynamic recrystallization grade and grain size were quantified using metallography. The recrystallization grade increased as the strain rate decreased, although showed less dependency on the temperature. Dynamic recrystallization occurred after the formation of deformation bands at strain rates above 0.1 s−1 and after the formation of subgrains when deforming at low strain rates. Recrystallized grains had a large number of sigma 3 boundaries, and their percentage increased with strain rate and temperature. The calculated apparent activation energy and strain rate exponent value were similar to those found for Inconel®718 when deforming above the solvus temperature.

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Section: Microstructure After Deformation and Damagesupporting

confidence: 90%

Hot Deformation Behavior of a Ni-Based Superalloy with Suppressed Precipitation

Lizzi

Pradeep

Stanojević

et al. 2021

Metals

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“…The abundance of twin boundaries has been pointed out by Wang et al 9 and Mitsche et al 10 ; however, 2D EBSD investigation cannot always show the existence of this relationship, especially at early stages where only a few of these grains can be observed in a 2D EBSD analysis. The 3D EBSD analysis includes the neighbouring grains from different layers and showed that most of the dynamically recrystallised grains were related by S3 boundaries, as shown in Fig.…”

Section: Orientations Of Dynamically Recrystallised Grainsmentioning

confidence: 95%

“…Dynamic recrystallisation generally originates at grain boundary bulges, which appear at relatively low strains and the process is usually assumed to be a form of strain induced boundary migration. Recent investigations into the nucleation of dynamic recrystallisation [7][8][9][10] have emphasised the role of twinning, and also deformation induced lattice rotation within the high angle grain boundary (HAGB) bulges. 11 The present investigation analyses material prepared and deformed in an earlier one 12,13 in which high resolution EBSD in 2D was used to study dynamic recrystallisation.…”

Section: Introductionmentioning

confidence: 99%

An investigation of dynamic recrystallisation on Cu–Sn bronze using 3D EBSD

Gholinia

Brough

Humphreys

et al. 2010

Materials Science and Technology

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A focused ion beam and electron backscatter diffraction were used to investigate the three-dimensional microstructure of small dynamically recrystallised grains in a deformed Cu–Sn alloy and to determine their orientation relationships. It was found that many of the grains, which form as thin sheets at the prior boundaries, are twin related. It is concluded that dynamical recrystallisation usually starts in regions where plastic deformation has resulted in significant lattice rotations beside the grain boundaries. Once such a new grain has formed, dynamic recrystallisation is propagated by successive twinning from the new grain, along the prior grain boundary, resulting in families of several hundred twin related dynamically recrystallised grains.

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“…The INCONEL718 (IN718) nickel-based superalloy is an aging strengthening superalloy that has been extensively used in the aerospace industry, energy industry, and mineral engineering owing to its high yield strength, good fatigue resistance, and good corrosion resistance [1][2][3]. This superalloy is often used to fabricate high-temperature structural parts, such as turbine blades, turbine disks, and high-temperature bolts [4][5][6].…”

Section: Introductionmentioning

confidence: 99%

Effect of Two-Stage Solution on Microstructure and Mechanical Property of IN718 alloy fabricated by selective laser melting

Tian

Cao

Wang

2023

Mater. Res. Express

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The substructure characteristics and mechanical properties of IN718 alloy prepared by selective laser melting (SLM) in the as-deposited state and different solid solution states were studied. The effects of the substructure characteristics, which include the precipitates and grain boundary features, on the microhardness of the IN718 alloy were discussed. It was found that the main substructure of the as-deposited alloy is the cellular structure that is formed owing to the segregation band of Nb and Ti elements with a thickness of 50 nm. The two-stage solution process and single-stage solution process can both correct the microsegregation of the as-deposited state, but the two-stage solution process can make the composition more uniform; at the same time, it leads to a large number of twin boundaries. The δ phase precipitates largely in the single-stage solution process at 980 ℃, but the two-stage solution process can effectively inhibit the precipitation of the δ phase.The hardness of the alloy after two-stage solution is lower than that of the single-stage solution alloy. The main strengthening mechanism of the as-deposited alloy is strain strengthening,The strengthening effect of δ precipitate is lower than the strain strengthening produced by the grain boundary of the alloy.

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Investigation on Dynamic Recrystallization Behavior in Hot Deformed Superalloy Inconel 718

Cited by 12 publications

References 7 publications

Hot Deformation Behavior of a Ni-Based Superalloy with Suppressed Precipitation

Hot Deformation Behavior of a Ni-Based Superalloy with Suppressed Precipitation

An investigation of dynamic recrystallisation on Cu–Sn bronze using 3D EBSD

Effect of Two-Stage Solution on Microstructure and Mechanical Property of IN718 alloy fabricated by selective laser melting

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