Deformation Behavior and Microstructural Evolution of Inconel 625 Superalloy during the Hot Compression Process

Chen, Fulong; Li, Kaidi; Tang, Bin; Liu, Degui; Zhong, Hong; Li, Jinshan

doi:10.3390/met11050824

Cited by 8 publications

(8 citation statements)

References 30 publications

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“…4d). Similar values for activation energy were reported for IN625 alloy (i.e., * 394 kJ mol -1 ) for a range of temperatures and strain rates, similar to those implemented in this study, suggesting the occurrence of significant dynamic recrystallisation [20].…”

Section: Activation Energy For Deformationsupporting

confidence: 86%

“…[21] has reported a transition in the microstructural evolution mechanisms from DDRX to continuous dynamic recrystallisation (CDRX) with an increase in temperature and reduction in strain rate. An increase in DRX and reduction in texture intensity with an increase in the deformation temperature has also been reported [20]. A study on the mechanical properties of a solution treated and aged IN625 alloy showed a substantial increase in work-hardening (WH) at lower temperatures and under high strain rates when tested at a range of temperatures and strain rates comprising of 920-1040 °C and 0.001-1 s -1 .…”

Section: Graphical Abstract Introductionmentioning

confidence: 73%

“…Typically, variations in temperature (e.g., due to temperature gradient), strain and strain rate due to non-uniform plastic deformation result in microstructural heterogeneity such as variation in grain size and localised carbide precipitation, and even surface cracks. Many investigations were carried out to explore the effects of process parameters on deformation behaviour in IN625 alloy [19][20][21][22][23]. These studies have mainly reported the dependency of the material's flow behaviour on strain rate and temperature.…”

Section: Graphical Abstract Introductionmentioning

confidence: 99%

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An innovative constitutive material model for predicting high temperature flow behaviour of inconel 625 alloy

et al. 2022

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Inconel 625 nickel alloy with its attractive high-temperature strength, excellent corrosion and oxidation resistance is mainly used for critical applications in demanding environments, in both as-cast and wrought conditions. Hot processing of this alloy is crucial for achieving its tailored mechanical properties due to the significant variation in microstructural changes with varying process parameters like temperature, strain, and strain rate. In this study, isothermal hot compression tests were carried out at temperatures ranging from 900 to 1100 °C, and under strain rates ranging from 0.01 to 1 s−1. The flow curves revealed three stages of deformation, including a substantial work-hardening stage followed by dynamic recovery and flow softening. Microstructural observations showed the occurrence of discontinuous dynamic recrystallisation (DDRX) as the dominant recrystallisation mechanism during the flow softening. Microstructural analysis suggested that the DRX was more sensitive to the test temperature as compared to the strain rate. An innovative material's constitutive model was developed, by combining Johnson–Cook (JC) and Avrami approaches, to predict work-hardening, dynamic recovery, and flow softening stages of deformation. The predicted flow behavior was in a good agreement with the experimentally measured data. The developed material model was integrated into DEFORM® 3D finite element (FE) simulation software as a user subroutine for the prediction of deformation behaviour in a double truncated cone (DTC) sample. Comparison between the experimentally measured data and the results of FE simulation on the DTC sample showed a very good convergence, indicating the suitability of the proposed material’s constitutive model for large scale simulations. Graphical Abstract

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Section: Activation Energy For Deformationsupporting

confidence: 86%

Section: Graphical Abstract Introductionmentioning

confidence: 73%

Section: Graphical Abstract Introductionmentioning

confidence: 99%

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An innovative constitutive material model for predicting high temperature flow behaviour of inconel 625 alloy

et al. 2022

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“…Alloying is an effective approach to enhancing the ductility of Mg alloys. Generally, the axial ratio c/a of Mg alloys is 1.6236, which makes the critical resolved shear stress (CRSS) of the basal plane much lower than that of prismatic and pyramidal planes [5,6]. The Li element is found to be effective in decreasing the axial ratio <c/a> of the Mg lattice, which would activate more slip systems, and hence, improve the ductility of the magnesium alloy as well [7,8].…”

Section: Introductionmentioning

confidence: 99%

Deformation Behavior and Dynamic Recrystallization of Mg-1Li-1Al Alloy

Feng

Pang

et al. 2021

Metals

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In this paper, the hot workability of Mg-1Li-1Al (LA11) alloy is assessed through a uniaxial compression test in a temperature range from 200 to 400 °C and a strain rate, έ, of 1–0.01 s−1. The present study reveals that flow stress increases when the strain rate increases and deformation temperature decreases. Based on the hyperbolic sine equation, the flow stress constitutive equation of this alloy under high-temperature deformation is established. The average activation energy was 116.5 kJ/mol. Avrami equation was employed to investigate the dynamic recrystallization (DRX). The DRX mechanism affected by the deformation conditions and Zener–Hollomon parameters is revealed. Finally, the relationship between DRX volume fraction and deformation parameter is verified based on microstructure evolution, which is consistent with the theoretical prediction.

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“…In order to solve various problems in processing, some scholars have studied the deformation behavior of Ni-based superalloys recently [9][10][11][12]. Chen et al [13] studied the hot-deformation behavior of GH4169 under different strain modes.…”

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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Deformation Behavior and Microstructural Evolution of Inconel 625 Superalloy during the Hot Compression Process

Cited by 8 publications

References 30 publications

An innovative constitutive material model for predicting high temperature flow behaviour of inconel 625 alloy

An innovative constitutive material model for predicting high temperature flow behaviour of inconel 625 alloy

Deformation Behavior and Dynamic Recrystallization of Mg-1Li-1Al Alloy

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

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