Hot deformation characteristics and processing map analysis of a new designed nickel-based alloy for 700 °C A-USC power plant

Wu, Yunsheng; Zhang, Maicang; Xie, Xiangyu; Dong, Jie; Lin, Fanghua; Zhao, Shuangqun

doi:10.1016/j.jallcom.2015.09.219

Cited by 57 publications

(10 citation statements)

References 66 publications

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“…In present study, it is particularly noticeable that the subgrains bulge formed at the original grain boundaries, as presented in the Figure 10c,d. The observation is a typical characteristic of DDRX, which was reported in previous investigations [33,34,35,36]. Furthermore, the new grains are observed to nucleate in the triple junction, as shown in Figure 10e,f.…”

Section: Resultssupporting

confidence: 83%

Superplastic Deformation and Dynamic Recrystallization of a Novel Disc Superalloy GH4151

Jia

et al. 2019

Materials

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The superplastic deformation of a hot-extruded GH4151 billet was investigated by means of tensile tests with the strain rates of 10−4 s−1, 5 × 10−4 s−1 and 10−3 s−1 and at temperatures at 1060 °C, 1080 °C and 1100 °C. The superplastic deformation of the GH4151 alloy was reported here for the first time. The results reveal that the uniform fine-grained GH4151 alloy exhibited an excellent superplasticity and high strain rate sensitivity (exceeded 0.5) under all experimental conditions. It was found that the increase of strain rate resulted in an increased average activation energy for superplastic deformation. A maximum elongation of 760.4% was determined at a temperature of 1080 °C and strain rate of 10−3 s−1. The average activation energy under different conditions suggested that the superplastic deformation with 1 × 10−4 s−1 in this experiment is mainly deemed as the grain boundary sliding controlled by grain boundary diffusion. However, with a higher stain rate of 5 × 10−4 s−1 and 1 × 10−3 s−1, the superplastic deformation is considered to be grain boundary sliding controlled by lattice diffusion. Based on the systematically microstructural examination using optical microscope (OM), SEM, electron backscatter diffraction (EBSD) and TEM techniques, the failure and dynamic recrystallization (DRX) nucleation mechanisms were proposed. The dominant nucleation mechanism of dynamic recrystallization (DRX) is the bulging of original grain boundaries, which is the typical feature of discontinuous dynamic recrystallization (DDRX), and continuous dynamic recrystallization (CDRX) is merely an assistant mechanism of DRX. The main contributions of DRX on superplasticity elongation were derived from its grain refinement process.

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Section: Resultssupporting

confidence: 83%

Superplastic Deformation and Dynamic Recrystallization of a Novel Disc Superalloy GH4151

Jia

et al. 2019

Materials

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“…The effects of friction and adiabatic heating on flow stress curves have been eliminated according to the methods described in other studies. [21,22] It is identical with the expectation that the flow stress increases with the decreasing deformation temperature and the increasing strain rate. At low strain, the flow stress increases quickly to the peak stress due to strain hardening.…”

Section: Flow Characteristicssupporting

confidence: 80%

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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“…The value of ζ was negative when deformation instability occurred according to previous research [4,[12][13][14][15]. The value of σ could be obtained from the flow stress model.…”

Section: Processing Mapsmentioning

confidence: 86%

“…The processing maps of nickel-based alloys have also been investigated intensively in recent years. Hot working maps of a nickel-based alloy for power plant applications were established by Wu et al, and it was revealed that the different recrystallization mechanisms could be reflected by the hot working maps [12]. The microstructures on the different domains of the processing maps of the IN028 alloy were inspected by Wang et al [13], and the study showed that the deformation mechanism maps agreed well with the processing maps.…”

Section: Introductionmentioning

confidence: 98%

Flow Behavior and Hot Processing Map of GH4698 for Isothermal Compression Process

et al. 2019

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An in-depth understanding of the flow behaviors of materials deformed at high temperatures is of paramount significance. However, insufficient research on the nickel-based GH4698 alloy has resulted in inaccurate material flow prediction or even cracking in the practical billet opening of GH4698 large forgings. In this study, hot compressions were performed at 950–1150 °C and 0.001–3 s−1. Single-peaked strain-stress curves were obtained under various conditions, owing to dislocation motions in dynamic recrystallizations. The Arrhenius model was formulated to accurately describe the flow stress evolutions and the mean prediction error of the flow stress was 5.90%. Processing maps were constructed at various hot working conditions. It was found that the hot working ability of GH4698 markedly decreased under lower temperatures (950–1080 °C) and higher strain rates (0.1–3 s−1). Optimal thermal processing parameters were suggested. In sum, this study systematically investigated the flow behaviors and hot working ability of GH4698 in isothermal compressions.

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Hot deformation characteristics and processing map analysis of a new designed nickel-based alloy for 700 °C A-USC power plant

Cited by 57 publications

References 66 publications

Superplastic Deformation and Dynamic Recrystallization of a Novel Disc Superalloy GH4151

Superplastic Deformation and Dynamic Recrystallization of a Novel Disc Superalloy GH4151

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

Flow Behavior and Hot Processing Map of GH4698 for Isothermal Compression Process

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