Recrystallization and aging effects associated with the high temperature deformation of waspaloy and inconel 718

Guimarães, A.A.; Jonas, John J.

doi:10.1007/bf02643571

Cited by 114 publications

(50 citation statements)

References 19 publications

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“…The classic interdependence of the flow stress and deformation parameters can be seen, namely: the flow stress increased with decreasing deformation temperature and increasing strain rate. This behavior is similar to the results obtained by Guimaraes and Jonas [21]. One must notice two distinguishable regions on the flow stress curves of the solution treated samples of Inconel alloy deformed at relatively low temperature, namely: 720, 800 and 850°C and with strain rate of 10 -4 s -1 (see Fig.…”

Section: Methodssupporting

confidence: 76%

Effect of Thermomechanical Working on the Microstructure and Mechanical Properties of Hot Pressed Superalloy Inconel 718

Nowotnik¹,

Sieniawski²

2010

7th International Symposium on Superalloy 718 and Derivatives (2010)

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Experimental results on hot deformation and dynamic structural processes of nickel based alloy Inconel 718 are reviewed. The focus is the analysis of dynamic precipitation processes which operate during hot deformation of these materials at elevated temperatures. Hot compression tests were performed on the solution treated precipitation hardenable nickel based superalloy Inconel 718 at 720-1150°C with a constant true strain rates of 10 -4 and 4x10 -4 s -1 . True stresstrue strain curves and microstructure analysis of the deformed nickel based superalloy is presented. The properties and dynamic behaviour are explained through observation of the microstructure using standard optical, scanning and transmission electron microscopy. Structural observations of solution treated Inconel 718 deformed at high temperatures, reveal non uniform deformation effects. The distribution of niobium-rich carbides were affected by localized flow within the strain range investigated at relatively low deformation temperatures 720 -850°C.

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Section: Methodssupporting

confidence: 76%

Effect of Thermomechanical Working on the Microstructure and Mechanical Properties of Hot Pressed Superalloy Inconel 718

Nowotnik¹,

Sieniawski²

2010

7th International Symposium on Superalloy 718 and Derivatives (2010)

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“…2a, b. The overall behavior is in broad agreement with that usually observed for IN718: A distinct peak stress, tending to be more pronounced at higher strain rates, is followed by significant post-peak flow softening that is generally attributed to recrystallization and/or adiabatic heating [6][7][8][9][10]. Since all the flow curves presented here have been corrected for the effect of deformation heating, the observed flow softening must, in this case, be due to the evolving microstructural state of the material.…”

Section: Deformation Behaviorsupporting

confidence: 71%

“…Significant research has been directed toward characterizing the precipitation and dissolution kinetics of the d phase in IN718 during heat treatment and aging, e.g., [1][2][3][4][5], and several experimental investigations have explored recrystallization associated with high-temperature compressive flow in solution-treated material, e.g., [6][7][8][9][10], but there has been rather less focus on the specific role of d precipitates during hot deformation. However, it is known that prior aging in the d stability field can have a significant effect on stress-strain response [11,12] and recent studies have highlighted the complexity of the mechanisms involved, including dynamic dissolution and reprecipitation [13], sub-grain formation [14], and platelet spheroidization [15].…”

Section: Introductionmentioning

confidence: 99%

Hot Forging of IN718 with Solution-Treated and Delta-Containing Initial Microstructures

Lalvani

Brooks

2016

Metallogr. Microstruct. Anal.

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A systematic study of the effect of d phase precipitate morphology on the hot deformation behavior and microstructural evolution in nickel superalloy Inconel 718 is presented. Isothermal compression tests at fixed nominal strain rates and temperatures relevant to industrial forging (0.001-0.3 s -1 and 990-1040°C) were used. Three distinct initial microstructures have been examined: (I) solution treated, (II) a microstructure with finely dispersed particulate d precipitates, and (III) a microstructure containing dense network of intragranular and grain boundary d platelets. The peak flow stress associated with these various microstructures has been rationalized using a single, temperature-compensated power law. This clearly demonstrates opposition of the external applied stress by an internal back stress related to the initial d phase morphology and apparent delta solvus temperature. Post-peak flow softening is attributed to dynamic recrystallization, aided by the dissolution of finer precipitates in material containing particulate d phase, and to a certain degree of mechanical grain refinement caused by distortion and offsetting of grain segments where a dense d-platelet structure exists.

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“…The compression curves ( Figure 4) present an initial stress peak for the first pass (SP, MPQ and MPD) as well as for the second pass (MPQ and MPD). According to a previous study [5], these peak stresses result from the competition between the dislocation mobility and solute atoms. It should be noted that the three first pass curves are similar.…”

Section: Mechanical Behaviourmentioning

confidence: 73%

“…The number of parameters is reduced when isothermal hot forging is performed. The literature gives many results for INCONEL 718 behaviour during a single pass hot deformation in the super-δ-solvus domain [1][2][3][4][5][6][7]. In the case of the super-δ-solvus domain, two papers only refer to multipass hot deformation [8][9]: the first study [8] was realized with an initial grain size of 250 µm (1200°C / 7 hours) much larger than the present grain size.…”

Section: Figure 1: Forging Domain Of Inconel 718mentioning

confidence: 99%

INCONEL718 Single and Multipass Modelling of Hot Forging

Jaeger¹,

Solas²,

Baudin³

et al. 2012

Superalloys 2012 (Twelfth International Symposium)

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A better understanding of the competition between several mechanisms (dynamic recovery, dynamic recrystallization and plasticity hardening) is crucial for aircraft engine manufacturers. The aim of this paper is to improve the microstructure and therefore the mechanical properties of a nickel based superalloy used for rotating forged pieces. A nickel superalloy microstructure is the result of several successive hot forging processes: multipass processes, with intermediate dwell time and quenching. In this paper, an original three dimensional approach able to simulate these processes is proposed. The specific role of the different steps of the processes is analysed. In this approach, several forging thermo-mechanical parameters are taken into account: the working temperature, the strain rate, the final strain, the interpass time, etc. At high forging temperature, the studied INCONEL 718 presents an austenitic matrix γ (face centred cubic) assumed to be in a single phase.This approach proposes a sequential coupling of two models, one devoted to deformation and the other to recrystallization. Such a coupling enables the estimation of the effect of deformation and of different recrystallization types on mechanical behaviour and on micro-structural evolution. The approach is performed at the grain scale and takes into account the whole thermo-mechanical cycle with a focus on the dynamic behaviour.The first polycrystalline model is based on the plasticity mechanisms at the grains scale. The framework corresponds to finite transformations (large lattice rotations and small elastic strains). The model is implemented in ABAQUS and CAST3M finite element codes. The second model is based on the recrystallization theory and uses a 3D cellular automaton. It describes dynamic recrystallization phenomena such as nucleation-growth and static or postdynamic recrystallization. Such recrystallization mechanisms were observed during interpass time or during the successive heatings depending on the thermomechanical paths used in multipass forging. Dislocation densities are the internal variables common to the two models. The simulations are performed on a 3D Representative Elementary Volume (aggregate) obtained from Electron Back Scattering mapping. Numerical results are compared to experimental microstructures.

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Recrystallization and aging effects associated with the high temperature deformation of waspaloy and inconel 718

Cited by 114 publications

References 19 publications

Effect of Thermomechanical Working on the Microstructure and Mechanical Properties of Hot Pressed Superalloy Inconel 718

Effect of Thermomechanical Working on the Microstructure and Mechanical Properties of Hot Pressed Superalloy Inconel 718

Hot Forging of IN718 with Solution-Treated and Delta-Containing Initial Microstructures

INCONEL718 Single and Multipass Modelling of Hot Forging

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