Interaction of Ta and Cr on Type-I hot corrosion resistance of single crystal Ni-base superalloys

Chang, Jianxiu; Wang, D.; Zhang, Guoren; Lou, Langhong; Zhang, J.

doi:10.1016/j.corsci.2017.01.011

Cited by 44 publications

(14 citation statements)

References 30 publications

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“…The stable sulfide phases in the Cr-S system can be denoted as CrS x where x is in the range of 1 to 1.5. [36,37] Sulfide formed in this manner is seen as the fine dispersed phase at the sub-surface regions of the superalloy during the initial stages of corrosion ( Figure 6). The diffusion of S from molten salt and formation of sulfides at the corrosion front is also reported during hot corrosion in other Ni-base superalloys such as Nimonic 100, [8] B1900, [38] IN738, [39] Nimonic 105 [40] and Udimet.…”

Section: Discussionmentioning

confidence: 99%

Type-I Hot Corrosion of Ni-Base Superalloy CM247LC in Presence of Molten Na2SO4 Film

Kumawat

Parlikar

Alam

et al. 2020

Metall Mater Trans A

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Type-I hot corrosion behavior of CM247LC superalloy is evaluated in the air at 950°C against low (3 to 4), intermediate (7 to 9), and high (12 to 14 mg cm À2) Na 2 SO 4 deposits. Duration of thermal exposure is varied from a very short duration of 5 minutes to long duration of 1000 hours. The alloy shows poor corrosion resistance and undergoes complete disintegration after 500 hours of thermal exposure. Degradation of alloy increases with the increase in the duration of exposure as well as the initially deposited amount of the salt. Based on the systematic analysis of the corrosion scale, degradation mechanisms supported by the microstructural evidence are proposed. Fluxing, sulfidation-oxidation, and sulfide-undercutting are reported as the primary degradation mechanisms for CM247LC alloy in the presence of Na 2 SO 4. Self-sustaining degradation of alloy leading to complete disintegration of specimen is caused by the changeover of fluxing mechanism from basic fluxing to alloy-induced fluxing.

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Section: Discussionmentioning

confidence: 99%

Type-I Hot Corrosion of Ni-Base Superalloy CM247LC in Presence of Molten Na2SO4 Film

Kumawat

Parlikar

Alam

et al. 2020

Metall Mater Trans A

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“…And these structures remained until the end of the hot corrosion experiment as shown in Figure 8 . Other researches have shown, MoO 3 , Ta 2 O 5 and NiO are easy to occur acid fluxing and lead to serious hot corrosion, while CrO 3 is likely to produce mild basic fluxing [ 23 ]. This means that the factors leading to acidic fluxing are greatly reduced by the dissolution of oxides and solid phase reactions.…”

Section: Discussionmentioning

confidence: 99%

“…Of course, all the above-mentioned discussions are obtained by pre-oxidation in air. If the alloy is under the cover of molten salt for a long time, because of the solid-liquid interface between the alloy and molten salt, there is no obvious volatilization, so stable Cr 2 O 3 can still be formed on the surface of the alloy, and provide excellent hot corrosion resistance for the alloy such as Alloy 3 [ 23 , 40 ]. In general, Cr 2 O 3 in the form of solid solution or non-volatile Cr 2 O 3 has a good hot corrosion resistance improvement.…”

Section: Discussionmentioning

confidence: 99%

“…In order to make the samples subjected to salt environment similar to the actual service of the material, the three kinds of specimens are sprayed with a saturated aqueous solution which is consist of 75 wt.% Na 2 SO 4 + 25 wt.% NaCl and followed by drying. After that, each specimen is weighted to ensure that a 0.3–0.5 mg/cm 2 salt is supplied on the surface of the sample [ 22 , 23 ]. Each sample is put into a crucible separately, and all crucibles are put into a box furnace at 900 °C for hot corrosion, and the kinetics of hot corrosion is studied.…”

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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“…Hot corrosion exists as Type I (known as High-Temperature Hot Corrosion) or Type II (Low-Temperature Hot Corrosion), with the former occurring above 800-950°C and the latter at 600-750°C [88,89]. The occurrence of either attack form is dependent on several parameters such as the composition of the alloy, contaminant, and gas.…”

Section: Characteristicsmentioning

confidence: 99%

Hot Corrosion and Oxidation Behaviour of TiAl Alloys during Fabrication by Laser Powder Bed Additive Manufacturing Process

Mogale¹,

Matizamhuka²,

Cobbinah³

2022

Corrosion - Fundamentals and Protection Mechanisms

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This research paper summarises the practical relevance of additive manufacturing with particular attention to the latest laser powder bed fusion (L-PBF) technology. L-PBF is a promising processing technique, integrating intelligent and advanced manufacturing systems for aerospace gas turbine components. Some of the added benefits of implementing such technologies compared to traditional processing methods include the freedom to customise high complexity components and rapid prototyping. Titanium aluminide (TiAl) alloys used in harsh environmental settings of turbomachinery, such as low-pressure turbine blades, have gained much interest. TiAl alloys are deemed by researchers as replacement candidates for the heavier Ni-based superalloys due to attractive properties like high strength, creep resistance, excellent resistance to corrosion and wear at elevated temperatures. Several conventional processing technologies such as ingot metallurgy, casting, and solid-state powder sintering can also be utilised to manufacture TiAl alloys employed in high-temperature applications. This chapter focuses on compositional variations, microstructure, and processing of TiAl alloys via L-PBF. Afterward, the hot corrosion aspects of TiAl alloys, including classification, characteristics, mechanisms and preventative measures, are discussed. Oxidation behaviour, kinetics and prevention control measures such as surface and alloy modifications of TiAl alloys at high temperature are assessed. Development trends for improving the hot corrosion and oxidation resistance of TiAl alloys possibly affecting future use of TiAl alloys are identified.

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Interaction of Ta and Cr on Type-I hot corrosion resistance of single crystal Ni-base superalloys

Cited by 44 publications

References 30 publications

Type-I Hot Corrosion of Ni-Base Superalloy CM247LC in Presence of Molten Na2SO4 Film

Type-I Hot Corrosion of Ni-Base Superalloy CM247LC in Presence of Molten Na2SO4 Film

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

Hot Corrosion and Oxidation Behaviour of TiAl Alloys during Fabrication by Laser Powder Bed Additive Manufacturing Process

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