Microstructural homogenization and high-temperature cyclic oxidation behavior of a Ni-based superalloy with high-Cr content

Zhang, Heng; Liu, Yuan; Chen, Xiang; Zhang, Huawei; Li, Yanxiang

doi:10.1016/j.jallcom.2017.08.137

Cited by 26 publications

(8 citation statements)

References 27 publications

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“…7 ). Generally, in the oxidation of nichrome alloys, loose NiO and Cr 2 O 3 are preferentially formed and finally transformed into NiCr 2 O 4 spinel in the case of prolonged oxidation 63 . It is interesting that, with the ENP processing, a dense chromium oxide nanocoating with triple hierarchical structure on alloy exterior surface can be obtained after eight consecutive pulses are released.…”

Section: Resultsmentioning

confidence: 99%

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Quasi-instantaneous materials processing technology via high-intensity electrical nano pulsing

Olevsky,

Jiang,

et al. 2024

Sci Rep

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Despite many efforts, the outcomes obtained with field-assisted processing of materials still rely on long-term coupling with other electroless processes. This conceals the efficacy and the intrinsic contributions of electric current. A new device utilizing electrical nano pulsing (ENP) has been designed and constructed to bring quasi-instantaneous modifications to the micro- and nano-structure in materials. Featuring ultra-high intensity (~ 1011 A/m2) and ultra-short duration (< 1 μs), the ENP technology activates non-equilibrium structural evolutions at nanometer spatial scale and nanosecond temporal scale. Several examples are provided to demonstrate its utility far outpacing any conventional materials processing technology. The ENP technology gives a practical tool for exploring the intrinsic mechanism of electric-field effects and a pathway towards the rapid industrial manufacturing of materials with unique properties.

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Section: Resultsmentioning

confidence: 99%

“…13 ). Studies find that long-time thermal heating, even at lower temperatures, can generate the surface mixed oxides and the matrix intergranular oxides 63 , 66 . However, as shown in Fig.…”

Section: Resultsmentioning

confidence: 99%

Quasi-instantaneous materials processing technology via high-intensity electrical nano pulsing

Olevsky,

Jiang,

et al. 2024

Sci Rep

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“…This double constitution of the external oxide scale, which was clearly seen here when the scale remained on the alloy despite the tendency to spallation during cooling, was earlier observed in other oxidized superalloys containing titanium. [34][35][36] Whatever it happened during cooling, collecting the lost oxides and analyzing them with the X-ray diffractometer allowed seeing that TiO 2 was present in the external scale even for the alloys richer in cobalt than in nickel, despite the tendency of the latter ones to lose their outermost part of external oxide by shear rupture. The external TiO 2 layer tended to be thicker for the nickel-richest alloys: this suggests an easier outwards diffusion of titanium, which can be explained by the easy availability of the Ti atoms only present in solid solution in the matrix.…”

Section: Discussionmentioning

confidence: 99%

Influence of Ti and Co/Ni Ratio on the Oxidation at 1200 °C of Chromium-Containing {Ni, Co}-Based Cast Alloys

Berthod

Wora

2021

Metall Mater Trans A

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This work investigates the possible influence that titanium may have on the oxidation of {nickel and/or cobalt}-based chromium-rich alloys. It starts with the elaboration by casting of a series of alloys from pure elements, with a base element ranging from nickel only to cobalt only. To magnify these possible effects of titanium and reach the atomic equivalence with the carbon present (0.4 wt pct C) in the alloys, 1.6 wt pct Ti was introduced in the chemical composition. To amplify the oxidation process, the oxidation tests carried out in laboratory air were run at the constant temperature of 1200 °C for a rather long time (170 hours). The surface states and cross-sections were characterized by XRD, electron microscopy and EDS analyses. The results demonstrate that all the alloys (except the nickel-free cobalt-based one) resisted oxidation rather well without catastrophic evolution due to titanium. The tested Ti content led to significant internal oxidation and to an external selective oxidation producing a thin layer stick on the outer side of the chromia scale. It is supposed that this outermost TiO 2 layer may be beneficial for the oxidation behavior by the possible limitation of the deleterious over-consumption of chromium by chromia re-oxidation/volatilization. This will be later verified by further investigations combining thermogravimetry follow-up of the oxidation rate and analysis of chromium balance sheets.

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“…Moreover, Cl 2 (g) may penetrate into the substrate through the pores and cracks in the scale, and may reach the metal/scale interface [33,34]. Once the partial pressure of Cl 2 (g) increases at the interface between the metal and scale, the metal elements are unstable and can easily form the reaction by Equations (4) and (5) [35,36]:…”

Section: Discussionmentioning

confidence: 99%

Corrosion Behavior of GH4169 Alloy under Alternating Oxidation at 900 °C and Solution Immersion

Liu

et al. 2019

Materials

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In this paper, the corrosion behavior of GH4169 superalloy under alternating oxidation (at 900 °C) and solution immersion (in 3.5% NaCl solution, 30 ± 1 °C) has been studied by SEM, XRD, XPS, and electron probe microanalysis (EPMA). The results show that the alternating environment increases the corrosion rate of GH4169. The reaction of NaCl and Cr2O3 generates various volatile and soluble corrosion products, such as Na2Cr2O7, CrCl3, Cl2, and Na2CrO4, at a high temperature. The destruction of the protective Cr2O3 film leads to the increase of defects in the oxide scale, promoting the formation of oxides, such as NiO and Fe2O3, and changes the composition and structure of the oxide film. After repeated iterations, the mixed oxides will result in the spalling of the oxide film because they can reduce the fracture toughness of the corrosion scale. Therefore, the corrosion is comprehensively intensified.

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Microstructural homogenization and high-temperature cyclic oxidation behavior of a Ni-based superalloy with high-Cr content

Cited by 26 publications

References 27 publications

Quasi-instantaneous materials processing technology via high-intensity electrical nano pulsing

Quasi-instantaneous materials processing technology via high-intensity electrical nano pulsing

Influence of Ti and Co/Ni Ratio on the Oxidation at 1200 °C of Chromium-Containing {Ni, Co}-Based Cast Alloys

Corrosion Behavior of GH4169 Alloy under Alternating Oxidation at 900 °C and Solution Immersion

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