Flow stress characteristics and microstructural evolution of cast superalloy 625 during hot deformation

Godasu, Ashwin Kumar; Prakash, U.; Mula, Suhrit

doi:10.1016/j.jallcom.2020.156200

Cited by 33 publications

(3 citation statements)

References 30 publications

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“…The flow stress remains steady or decreases after reaching the peak stress at high strain rate and low temperature, which results from the DRX during hot deformation. [ 23,24 ] However, the flow stress decreases first and then increases at low strain rate and high temperature, such as 0.01 s −1 /1000–1170 °C, 0.1 s −1 /1100–1170 °C, and 1.0 s −1 /1150–1170 °C, as shown in Figure 3a–c.…”

Section: Resultsmentioning

confidence: 98%

“…The processing map based on the dynamic materials model (DMM) [30] is composed of power dissipation map and flow instability map. It has been successfully applied in many alloys [21,24,[31][32][33][34][35][36][37][38][39] and the establishment process was described in detail in the study by Wu et al [21] The processing maps of the Fe-Ni-Cr based alloy at the true strains of 0.36, 0.51, 0.69, 0.92, 1.05, and 1.20 (corresponding to the nominal strains of 30%, 40%, 50%, 60%, 65%, and 70%) are shown in according to the power dissipation efficiency and the instability parameter. The peaks of the power dissipation efficiency at medium and high temperature are indicated by blue squares and circles, respectively.…”

Section: Processing Mapmentioning

confidence: 99%

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The Role of Strain and Dynamic Recrystallization During Hot Deformation of a Fe–Ni–Cr‐Based Alloy

Wang

Qin

et al. 2022

Adv Eng Mater

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The fossil fuel power plant is the dominant method for the generation of electricity around the world at present. [1] However, the combustion of fossil fuels, especially coal combustion, emits a large amount of CO 2 , NO x , and SO x , which aggravates the greenhouse effect and environmental pollution. [2][3][4][5][6] The development of nuclear power is necessary to reduce the environmental pollution and alleviate fossil energy crisis. From the 1950s to the present, nuclear power technology has evolved to generation IV. As one of the six nuclear systems of generation IV, the sodium-cooled fast reactor (SFR) has attracted world attention due to its low nuclear waste, high security, and utilization efficiency of uranium. [1,[7][8][9][10] With the development of nuclear power technology, higher requirements for the materials used in SFR have been brought forward. For example, as one of the key components in SFR, the guide tube of the control rod should possess excellent nuclear performance, high strength and ductility, as well as great hot corrosion resistance under the service environment of neutron irradiation, continuous impact, and liquid sodium at 250-560 °C. [11] The solution-strengthening superalloy with good combination properties can fulfil the requirements of the guide tube. The microstructure of the guide tube should be fine and uniform to ensure the high security of the nuclear power plant. However, the various tube thicknesses leads to complicated processing technology (forging, punching, hot extrusion, and hot rolling) for guide tube. The investigated alloy in this article is a solutionstrengthening superalloy used in the nuclear power plant.The previous studies about materials used in nuclear power plants mainly focused on the irradiation damage. Zhang et al. [12] investigated the effects of irradiation dose on the microstructure damages, including lattice defects, cavities, and stability of precipitates, in Inconel X-750 at elevated temperatures. Jin et al. [13] and Wan et al. [14] studied the evolution of the precipitates (γ 0 and γ 00 ) and the dislocation-precipitates interaction in Inconel 718 alloy under irradiation conditions. The sizes of γ 0 and γ 00 were smaller and the structure of γ 0 and γ 00 became disordered with the increasing irradiation dose. The dislocation-precipitates (γ 00 ) interaction under irradiation conditions led to the appearance of dislocation cells composed of precipitates, trailing dislocations, and dislocation loops. Meanwhile, the stress corrosion damage of Inconel 718 alloy in pressurized water reactor service was investigated by Leonard. [15] In addition, Mathew et al. [16] and Bhaduri et al. [17] studied the mechanical properties (tensile, creep, fatigue, and creep-fatigue interaction) of 316 LN SS alloy used in SFR. Nevertheless, the hot working of the nuclear power plant materials has been ignored. Meanwhile, the superalloy possesses high deformation resistance due to the solid strengthening effect by Cr, Mo, and other elements. [18][19][20] It is difficult to ca...

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Section: Resultsmentioning

confidence: 98%

Section: Processing Mapmentioning

confidence: 99%

The Role of Strain and Dynamic Recrystallization During Hot Deformation of a Fe–Ni–Cr‐Based Alloy

Wang

Qin

et al. 2022

Adv Eng Mater

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“…A typical flow curve measured for the IN625 alloy consisted of an initial work-hardening stage followed by flow softening beyond a strain level corresponding to the peak stress (e p ). The flow softening characteristics depend on dominant microstructural deformation mechanisms operating during deformation [33]. The measured true-stress-true-strain curves exhibited work-hardening stage up to the peak stress then switched to a flow softening phase thereafter (Fig.…”

Section: Flow Behaviourmentioning

confidence: 98%

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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High-Strain Rate and High-Temperature Properties of Additively Manufactured Nickel-Based Alloy 718

Sankar,

Mallaiah,

McCarthy

et al. 2024

The Minerals, Metals &Amp; Materials Series

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Flow stress characteristics and microstructural evolution of cast superalloy 625 during hot deformation

Cited by 33 publications

References 30 publications

The Role of Strain and Dynamic Recrystallization During Hot Deformation of a Fe–Ni–Cr‐Based Alloy

The Role of Strain and Dynamic Recrystallization During Hot Deformation of a Fe–Ni–Cr‐Based Alloy

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

High-Strain Rate and High-Temperature Properties of Additively Manufactured Nickel-Based Alloy 718

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