Microstructure evolution during dynamic recrystallization of hot deformed superalloy 718

Wang, Y.; Shao, Wen‐Zhu; Zhen, Liang; Zhang, X.M.

doi:10.1016/j.msea.2007.09.008

Cited by 195 publications

(77 citation statements)

References 28 publications

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“…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%

“…For INCONEL 718, the dynamic recrystallization mechanism was characterized as a discontinuous process (see for instance, Wang et al [2]). Some authors [3][4] report a necklace dynamic recrystallization process, depending on the deformation rate and the temperature compatible with a discontinuous behaviour of the dynamic recrystallization.…”

Section: Figure 1: Forging Domain Of Inconel 718mentioning

confidence: 99%

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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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Section: Figure 1: Forging Domain Of Inconel 718mentioning

confidence: 99%

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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“…Higher grain-boundary mobility results in the nucleation of the twins, which act as the main activate nucleation mechanism of DRX for nickelbased superalloys deformed at higher temperatures. This accelerates the bulging and the separation of bulged parts from the original grains 8 . The amount of twin boundaries increases with increased strain.…”

Section: Microstructurementioning

confidence: 99%

Microstructural evolution of Inconel 625 during hot rolling

Tehovnik¹,

Burja²,

...³

2015

Mater. Tehnol.

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This research provides an overview of the structural changes that occur during the hot rolling of the nickel superalloy Inconel 625. It is well known that microstructure control is of paramount importance concerning the mechanical properties of a material. The microstructure also plays an important role in processing materials at elevated temperature. In this work the hot-rolling behaviour of the Inconel 625 superalloy has been investigated. The specimens were hot rolled at a temperature of 1200°C using different numbers of passes. During the hot rolling the loads were measured and recorded. A light microscope and an electron microscope, employing the electron-backscatter-diffraction (EBSD) technique, were employed to investigate the microstructure evolution, revealing a necklace dynamic-recrystallization mechanism. Keywords: nickel superalloy, hot rolling, dynamic recrystallization, necklace mechanism Raziskava obsega pregled strukturnih sprememb, ki se pojavijo med vro~im valjanjem nikljeve superzlitine Inconel 625. Znano je, da je kontrola mikrostrukture odlo~ilnega pomena za mehanske lastnosti materiala. Mikrostruktura ima pomemben vpliv na predelavo materiala pri povi{anih temperaturah. Preu~evali smo superzlitino Inconel 625 med vro~im valjanjem. Vzorci so bili vro~e valjani pri temperaturi 1200°C z razli~nimi {tevili prevlekov, med poizkusi smo merili tudi sile valjanja. Vzorce smo preiskali s svetlobnim in elektronskim mikroskopom s tehniko difrakcije povratno sipanih elektronov (EBSD). Raziskali smo razvoj mikrostrukture in potrdili dinami~no rekristalizacijo preko "mehanizma ogrlice".

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“…A laminação a quente é um processo de deformação primária bastante eficiente, em que a variação de temperatura durante o procedimento pode intervir na distribuição de tensões e deformações alterando a microestrutura do material. A caracterização microestrutural e o comportamento recristalizado da liga 718 deformada a quente têm sido estudado para se obter um melhor controle do processamento termomecânico e desempenho do material [5]. Outra forma de processamento para melhorar as propriedades mecânicas da liga 718 é através da distribuição característica dos contornos de grão, conhecida como engenharia de contorno de grão.…”

Section: Introductionunclassified

“…Os CSLs gerados pelo processamento da engenharia de contorno de grão para ligas com baixa energia de falha de empilhamento são Ʃ3 n (Ʃ3, Ʃ9 e Ʃ27), com maclas de recozimento coerentes e incoerentes, sendo o Ʃ3 um contorno de grande contribuição para melhoria das propriedades devido a sua baixa energia [6,7]. Alguns autores [5,8] compararam o efeito de diferentes parâmetros de processamento termomecânico, na laminação a frio associada a engenharia de contorno grão da liga 718. Desta forma, o objetivo desse trabalho é investigar o efeito de duas diferentes rotas de processamento termomecânico, laminação a quente e engenharia de contorno de grão, a fim de melhorar as propriedades mecânicas do material.…”

Section: Introductionunclassified

O Efeito De Diferentes Rotas De Processamento Associadas a Engenharia De Contorno De Grão E Melhoria Das Propriedades Mecânicas

Medeiros¹,

Melo²,

Guimarães³

et al. 2017

Anais Do Congresso Anual Da ABM

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ResumoA liga de níquel 718 encontra aplicações variadas nas indústrias aeronáutica, aeroespacial, óleo e gás e nuclear em função da excelente combinação entre resistência e ductilidade. As diferentes formas de processamento utilizadas para sua elaboração tendem a unir processos de deformação com temperatura, a fim de melhorar as propriedades mecânicas do material. Sendo assim, o presente trabalho tem como objetivo a caracterização e investigação do efeito de rotas de processamento termomecânicos distintas, avaliando a repercussão na fração de contornos especiais, dos carbetos (Nb,Ti)C e nas propriedades mecânicas do material endurecido por precipitação. Palavras-chave: Liga 718; Engenharia de contorno de grão; Tratamento termomecânico; Carbetos. EFFECT OF DIFFERENT PROCESSING ROUTES ASSOCIATED WITH GRAIN BOUNDARY ENGINEERING AND IMPROVEMENT OF MECHANICAL PROPERTIES AbstractThe nickel alloy 718 are the most varied applications in the aerospace, oil and gas and nuclear industries in excellent combination of function between resistance and ductility. The different forms of mechanical process used for their preparation usually combine deformation processes and temperature in order to improve the mechanical properties of the material. Thus, this study aims to characterize and investigate the effect of different thermomechanical process routes, evaluating the impact on the special boundary fraction, the carbides (Nb,Ti)C and mechanical properties of a precipitation hardenend material.

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Microstructure evolution during dynamic recrystallization of hot deformed superalloy 718

Cited by 195 publications

References 28 publications

INCONEL718 Single and Multipass Modelling of Hot Forging

INCONEL718 Single and Multipass Modelling of Hot Forging

Microstructural evolution of Inconel 625 during hot rolling

O Efeito De Diferentes Rotas De Processamento Associadas a Engenharia De Contorno De Grão E Melhoria Das Propriedades Mecânicas

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