Influence of Cr content on hot corrosion and a special tube sealing test of single crystal nickel base superalloy

Chen, Zehao; Dong, Tao; Qu, Weiwei; Ru, Yi; Zhang, Heng; Pei, Yanling; Gong, Shengkai; Li, Shusuo

doi:10.1016/j.corsci.2019.05.001

Cited by 47 publications

(14 citation statements)

References 26 publications

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“…The surface products of unsealed prefabricated oxidation layer corroded specimen were similar to normal corrosion products. However, the ultimate integrity of the outer layer for Alloy 1 with prefabricated oxidation layer was better than normal Alloy 1(the normal experimental have been carried out before) as shown in Figure 6 d [ 25 , 28 ]. There were no obvious cracks on the surface which can explain the improvement of hot corrosion resistance reflected in the kinetic curves in one respect.…”

Section: Resultsmentioning

confidence: 99%

“…In addition to reducing acid fluxing, Cr 2 O 3 also has a great stabilizing effect on NiO. NiO, as a strong non-neutral oxide, greatly promotes the polarization of molten salt-alloy interface and aggravates the occurrence of hot corrosion [ 25 ]. The appearance of Cr 2 O 3 can produce solid-phase reaction with nickel oxide as follow:

…”

Section: Discussionmentioning

confidence: 99%

“…A tube sealing method that have been improved before is also used as Figure 2 showed which can not only study the hot corrosion characteristics under low oxygen condition, but also reflect the actual atmosphere environment faced by the blade material when oxygen is kept at a low content due to altitude or combustion to some extent [ 25 ]. Three different Cr content samples after pre-oxidation are coated with saturated aqueous solution of salt (1.6–1.8 mg/cm 2 ) to maintain the reaction operation within 200 h [ 26 , 27 ].…”

Section: Methodsmentioning

confidence: 99%

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Effects of Different Surface Native Pre-Oxides on the Hot Corrosion Properties of Nickel-Based Single Crystal Superalloys

Chen

et al. 2020

Materials

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A study is carried out on the effect of different surface native pre-oxides on hot corrosion of single crystal nickel-based superalloy at 900 °C. The effect of different oxides formed by different superalloys through pre-oxidation on hot corrosion is verified by normal hot corrosion and tube sealing experiments. The relationship between different surface oxides and the effect of different surface oxides layer on the hot corrosion properties of alloys are studied. In summary, the stable and dense surface pre-Al2O3 layer which can be obtained by pre-oxidation has an obvious positive effect on the improvement of superalloy hot corrosion resistance in reaction. In addition, the internal sulfides are analyzed in depth, and the relationship between Cr, Mo, O and S is discussed in detail.

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Section: Resultsmentioning

confidence: 99%

…”

Section: Discussionmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

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Effects of Different Surface Native Pre-Oxides on the Hot Corrosion Properties of Nickel-Based Single Crystal Superalloys

Chen

et al. 2020

Materials

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“…Hereafter, the parabolic behavior at II stage will occur, with the formation of protective oxide layer [82,83]. Stages III and/or IV appear when the oxidation time is long enough or the oxidation resistance is really poor [77,[84][85][86].…”

Section: Oxidation Kineticsmentioning

confidence: 99%

Performance of High-temperature Coatings : Oxidation and Interdiffusion

Sun

2023

Linköping Studies in Science and Technology. Licentiate Thesis

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The use of aluminiferous coatings profoundly improves the service life of superalloys but leads to the microstructural degradation of superalloys and thus the loss of mechanical properties. To solve this trade-off, two strategies were employed in this research. At first, we modified MCrAlY coatings by inducing Ta to reduce the interdiffusion effect on substrate alloys. This strategy was verified by 2000 h/1100 °C oxidation tests in two Ta-containing MCrAlY-IN792 systems. The system with 3.3 wt.% Ta MCrAlY displays an outstanding resistance to γ′ depletion in the substrate and comparable oxidation property in comparison with a reference system of Ta-free MCrAlY-IN792. Increasing Ta to 7.4 wt.% results in reduced oxidation resistance. Thermodynamic simulations revealed the phase-Prof. Ru Lin Peng, for her infinite enthusiasm and support, valuable discussions and constructive comments. And I have learned a lot from her rigorous science cogitation. Secondly, I want to thank my co-supervisor Dr.Xin-Hai Li, from Siemens Industrial Turbomachinery AB and Prof. Johan Moverare for providing the valuable guidance and fruitful discussions. Special thanks are addressed to Pimin Zhang and Kang Yuan, former PhDs from our division, who have done outstanding jobs as a good guidance for my following research. My thanks also go to my collaborators from Charmers University, Dr. Xiaolong Li and Pr. Sheng Guo, who have prepared materials for our project. And I want to thank all my colleagues in Engineering Materials for their kind help during the study. Sincerely, appreciate our head of division, Mattias Calmunger for his warm concern, Jinghao and Rodger for their supporting in my oxidation experiments.

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“…The superalloys which can be resistant to severe corrosion must have a high Cr content, in order to develop a Cr 2 O 3 protective layer [26][27][28][29]. The effect of Cr on improving the corrosion resistance of nickel-based superalloy is not only the formation of Cr 2 O 3 is relatively stable, not prone to catastrophic acid fluxing, but also the inhibition and stabilization effect on the formation of NiO [30]. The combination of electrostatic interaction and diffusion motion of molecules and ions caused the redistribution of their positions and the formation of continuous, dense, even, and protective layers.…”

Section: Electrochemical Behavior Of the Cmsx-4 Superalloymentioning

confidence: 99%

Electrochemical Behaviors of Ni-Base Superalloy CMSX-4 in 3.5 wt.% NaCl: Effect of Temperature and Preoxidation

Zhang

et al. 2020

Materials

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The electrochemical behaviors of the Ni-base superalloy CMSX-4 were carried out in 3.5 wt.% NaCl solution using electrochemical technique. The electrochemical corrosion process was divided into four stages, and reactions at the alloy surface and corrosion morphology at each stage were analyzed. The passivity mechanism at the stable passivation stage and the occurrence of pitting corrosion at the transpassivation state were discussed especially. The corrosion parameters including Ecorr, Epass, ipass and Epit were compared at different temperatures to reveal the relationship between the temperature and the corrosion resistance properties. The corrosion products were investigated by the aid of X-Ray Diffraction (XRD) and Energy Dispersive Spectroscopy (EDS). By designing different preoxidation procedures, the corrosion mechanism of oxide scales was analyzed for the preoxidized samples.

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Influence of Cr content on hot corrosion and a special tube sealing test of single crystal nickel base superalloy

Cited by 47 publications

References 26 publications

Effects of Different Surface Native Pre-Oxides on the Hot Corrosion Properties of Nickel-Based Single Crystal Superalloys

Effects of Different Surface Native Pre-Oxides on the Hot Corrosion Properties of Nickel-Based Single Crystal Superalloys

Performance of High-temperature Coatings : Oxidation and Interdiffusion

Electrochemical Behaviors of Ni-Base Superalloy CMSX-4 in 3.5 wt.% NaCl: Effect of Temperature and Preoxidation

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