Effect of initial state on hot deformation and dynamic recrystallization of Ni-Fe based alloy GH984G for steam boiler applications

Wu, Yunsheng; Liu, Zhuang; Qin, Xin; Wang, Changshuai; Zhou, Lanzhang

doi:10.1016/j.jallcom.2019.05.022

Cited by 74 publications

(16 citation statements)

References 72 publications

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“…From the kernel average misorientation (KAM) maps, it can be seen that the average KAM value at 600 °C of 2.03 was higher than 1.467 at 900 °C, indicating the occurrence and coarsening of dynamic recrystallization [ 28 , 29 ]. Similarly, this phenomenon was also found in the Cu-Ni-Co-Si-Cr-Ce alloy, as shown in Figure 5 c,d respectively.…”

Section: Resultsmentioning

confidence: 99%

“…The migration of grain boundaries plays an important role in hot deformation, and the migration of grain boundaries is related to dislocations near the grain boundaries. From the kernel average misorientation (KAM) maps, it can be seen that the average KAM value at 600 °C of 2.03 was higher than 1.467 at 900 °C, indicating the occurrence and coarsening of dynamic From the kernel average misorientation (KAM) maps, it can be seen that the average KAM value at 600 • C of 2.03 was higher than 1.467 at 900 • C, indicating the occurrence and coarsening of dynamic recrystallization [28,29]. Similarly, this phenomenon was also found in the Cu-Ni-Co-Si-Cr-Ce alloy, as shown in Figure 5c,d respectively.…”

Section: Ebsdmentioning

confidence: 99%

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Microstructure Evolution in Cu-Ni-Co-Si-Cr Alloy During Hot Compression by Ce Addition

et al. 2020

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Cu-Ni-Si alloys are widely used in lead frames and vacuum devices due to their high electrical conductivity and strength. In this paper, a Cu-Ni-Co-Si-Cr-(Ce) alloy was prepared by vacuum induction melting. Hot compression tests of the Cu-Ni-Co-Si-Cr and Cu-Ni-Co-Si-Cr-Ce alloys were carried out using a Gleeble-1500 simulator at 500–900 °C deformation temperatures and 0.001–10 s−1 strain rates. The texture change was analyzed by electron backscatter diffraction. The <110> fiber component dominated the texture after compression, and the texture intensity was reduced during recrystallization. Moreover, the average misorientation angle φ for Cu-Ni-Co-Si-Cr-Ce (11°) was lower than that of Cu-Ni-Co-Si-Cr (16°) under the same conditions. Processing maps were developed to determine the optimal processing window. The microstructure and precipitates of the Cu-Ni-Co-Si-Cr and Cu-Ni-Co-Si-Cr-Ce alloys were also analyzed. The average grain size of the Cu-Ni-Co-Si-Cr-Ce alloy (48 μm) was finer than that of the Cu-Ni-Co-Si-Cr alloy (80 μm). The average size of precipitates in the Cu-Ni-Co-Si-Cr alloy was 73 nm, while that of the Cu-Ni-Co-Si-Cr-Ce alloy was 27 nm. The addition of Ce delayed the occurrence of dynamic recrystallization.

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Section: Resultsmentioning

confidence: 99%

Section: Ebsdmentioning

confidence: 99%

Microstructure Evolution in Cu-Ni-Co-Si-Cr Alloy During Hot Compression by Ce Addition

et al. 2020

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“…The strain rate and temperature have significant effects on flow stress during hot deformation, which can be summarized by Arrhenius equation [25][26][27][28][29] first proposed by Sellars and Tegart. [28] The establishment of the Arrhenius equation of the superalloy was described in the study by Wu et al [23] According to Equation. ( 6)-( 12) in the study by Wu et al, [23] the constitutive equation of investigated alloy was obtained as follows.…”

Section: Flow Characteristicsmentioning

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

Self Cite

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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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“…[1][2][3][4][5] Dynamic softening also plays a vital role in refining the grain and loading distribution when optimizing the rolling process. [6][7][8] In recent years, dynamic softening has been explored in several experimental and theoretical studies. The dynamic recrystallization (DRX) kinetics model was established by Sellars et al [9] In a follow-up study, Yada et al, [10] Kim et al, [11,12] and Kopp et al [13] modified the DRX kinetics model based on different deformation parameters.…”

Section: Introductionmentioning

confidence: 99%

“…[ 1–5 ] Dynamic softening also plays a vital role in refining the grain and loading distribution when optimizing the rolling process. [ 6–8 ]…”

Section: Introductionmentioning

confidence: 99%

Dynamic Recrystallization Behavior of Low‐Carbon Steel during the Flexible Rolling Process: Modeling and Characterization

Liu

Mapelli

Peng

et al. 2021

steel research int.

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Dynamic recrystallization (DRX) is the predominant softening mechanism under high‐temperature large‐plastic deformation and determines the microstructure evolution of steel. Herein, an equivalent substitution method is proposed to investigate the coupling effect of deformation conditions on microstructural evolution during the flexible rolling process. Low‐carbon steel is compressed using a Gleeble 3800‐GTC thermal–mechanical physical simulation system at temperatures ranging from 900 to 1100 °C and strain rates ranging from 0.01 to 10 s−1. The flow stress behaviors under different deformation conditions are discussed. Accordingly, the relationship between strain rate and temperature is established using the Zener–Hollomon equation. Further, a new DRX model is proposed by combining the theoretical implications of previous models. The effectiveness of the experimental model and predicted model is statistically evaluated to accurately determine the DRX volume fraction of the experimental steel. Based on the dynamic material model, a hot processing map of the experimental steel is also developed to evaluate the steel's hot workability. Finally, the microstructure of the experimental steel is analyzed under specific deformation parameters. The results demonstrate that DRX behavior decreases as the upper roller is raised and the lower roller is lowered during the flexible rolling process.

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Effect of initial state on hot deformation and dynamic recrystallization of Ni-Fe based alloy GH984G for steam boiler applications

Cited by 74 publications

References 72 publications

Microstructure Evolution in Cu-Ni-Co-Si-Cr Alloy During Hot Compression by Ce Addition

Microstructure Evolution in Cu-Ni-Co-Si-Cr Alloy During Hot Compression by Ce Addition

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

Dynamic Recrystallization Behavior of Low‐Carbon Steel during the Flexible Rolling Process: Modeling and Characterization

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