Hot corrosion and low cycle fatigue of a Cr2AlC-coated superalloy

Smialek, James L.; Nesbitt, James A.; Gabb, Timothy P.; Garg, A.; Miller, Robert A.

doi:10.1016/j.msea.2017.10.098

Cited by 44 publications

(42 citation statements)

References 18 publications

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“…Interestingly, the coatings present a good adhesion to the substrate since the system can be bent up to 90° and 135° without any visible spallation or defect of the coatings. The main idea of these coatings is to act as bond coat in TBC systems, but as reported in the literature, Cr 2 AlC is an excellent candidate to protect metallic superalloys from aggressive environments . As a results, SG20 coatings were tested under thermal loading conditions and their performance is explained in the next section.…”

Section: Resultsmentioning

confidence: 91%

“…Even though most of the investigation has been focused on MAX phases as bulk component, coatings as protective material against oxidation and corrosion have gained considerable interest in the last years. For example, advanced turbine disks can be protected against Type I and II of low‐temperature hot salt corrosion (LTHC) . Cr 2 AlC thin films have been deposited by high power impulse magnetron sputtering on a low γ'solvus and a high refractory content alloy, named “LSHR” and developed at NASA Glenn Research Center.…”

Section: Introductionmentioning

confidence: 98%

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Cr₂AlC MAX phase as bond coat for thermal barrier coatings: Processing, testing under thermal gradient loading, and future challenges

et al. 2019

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Cr2AlC layers with thickness up to 100 µm were deposited by high‐velocity‐atmospheric plasma spray (HV‐APS) on Inconel 738 substrates to analyze the potential of MAX phases as bond coat in thermal barrier coating systems (TBCs). The deposited Cr2AlC layers showed high purity with theoretical densities up to 93%, although some secondary phases were detected after the deposition process. On top of this MAX phase layer, a porous yttria‐stabilized zirconia (YSZ) was deposited by atmospheric plasma spraying. The system was tested under realistic thermal loading conditions using a burner rig facility, achieving surface and substrate temperatures of 1400°C and 1050°C, respectively. The system failed after 745 cycles mainly for three reasons: (i) open porosity of the bond coat layer, (ii) oxidation of secondary phases, and (iii) inter‐diffusion. Nevertheless, these results show a high potential of Cr2AlC and other Al‐based MAX phases as bond coat material for high‐temperature applications. Furthermore, future challenges to transfer MAX phases as eventual bond coat or protective layer are discussed.

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Section: Resultsmentioning

confidence: 91%

Section: Introductionmentioning

confidence: 98%

Cr₂AlC MAX phase as bond coat for thermal barrier coatings: Processing, testing under thermal gradient loading, and future challenges

et al. 2019

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“…Further approaches towards the industrial applicability of such coatings have been reported in Refs. [13,14]. Smialek et al [13] undertook studies of hot corrosion and low cycle fatigue on Cr 2 AlC-coated high refractory alloys.…”

mentioning

confidence: 99%

“…[13,14]. Smialek et al [13] undertook studies of hot corrosion and low cycle fatigue on Cr 2 AlC-coated high refractory alloys. It has been shown that the coating successfully prevents the hot corrosion pitting occurring in the uncoated samples.…”

mentioning

confidence: 99%

Incipient low-temperature formation of MAX phase in Cr–Al–C films

Crisan

2018

J Adv Ceram

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Ceramic-metallic MAX phase of chromium aluminium carbide ternary compounds was successfully obtained through deposition by DC sputtering onto Si substrates. A study of the influence of substrate temperature and in-air post-annealing on the film crystallinity and oxidation was undertaken. Scanning electron microscopy (SEM), wavelength-dispersive X-ray analysis (WDSX), and X-ray diffraction (XRD) were used for film characterization. It is shown that, at substrate temperature of about 450 ℃, as-deposited films are amorphous with small nanocrystals. Subsequent annealing in air at 700 ℃ leads to film crystallization and partial oxidation. WDSX spectroscopy shows that the films oxidise to a depth of around 120 nm, or 5% of total film thickness which amounts at around 2.68 µm. As a novelty, this demonstrates the possibility of in-air crystallization of Cr 2 AlC films without significant oxidation. Materials Analysis Using Diffraction (MAUD) software package for a full-profile analysis of the XRD patterns (Rietveld-type) was used to determine that, as a result of annealing, the average crystallite size changes from 7 to 34 nm, while microstrain decreases from 0.79% to 0.24%. A slight tendency of preferential growth along the (10 10) direction has been observed. Such texturing of the microstructure has the potential of inducing beneficial anisotropic fracture behaviour in the coatings, potentially interesting for several industrial applications in load-bearing devices.

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“…To manufacture aeroengine components such as blisk is one of the potential application of LFWed Ti 2 AlNb joint. The severe service environment of blisk may lead to oxidation and hot corrosion at high temperature . Hot corrosion is a mechanism of corrosion that occurs in gas turbines, furnaces or other machinery encountering with combustion gas consisting of corrosive contaminants.…”

Section: Introductionmentioning

confidence: 99%

Hot corrosion behavior of three different zones of linear friction welded Ti‐22Al‐25Nb alloy

Chen

Xie

et al. 2018

Materials & Corrosion

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Ti‐22Al‐25Nb joint was achieved by using linear friction welding (LFW) technique. The hot corrosion behavior of base metal, weld zone, and thermo‐mechanically affected zone (TMAZ) was investigated at 700 °C in 25% NaCl‐75% Na2SO4 (wt%) mixed molten salt. In the initial stage, the base metal and joint exhibit similar oxidation resistant ability, and the corrosion products formed on all zones are mainly composed of TiO2, Nb2O5, and Al2O3. The formation of NaNbO3 first occurs in base metal and TMAZ after 50 h, while the weld zone is free of NaNbO3 until 100 h. The development of pitting corrosion in both base metal and TMAZ is caused by the diffusion of sulfur and re‐oxidation of sulfides. After a prolong exposure in molten salts, more serious sulfuration, acid dissolution, and escape of gaseous chlorides occurred in base metal leading to a drastic acceleration of corrosion rate.

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Hot corrosion and low cycle fatigue of a Cr2AlC-coated superalloy

Cited by 44 publications

References 18 publications

Cr₂AlC MAX phase as bond coat for thermal barrier coatings: Processing, testing under thermal gradient loading, and future challenges

Cr₂AlC MAX phase as bond coat for thermal barrier coatings: Processing, testing under thermal gradient loading, and future challenges

Incipient low-temperature formation of MAX phase in Cr–Al–C films

Hot corrosion behavior of three different zones of linear friction welded Ti‐22Al‐25Nb alloy

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Hot corrosion and low cycle fatigue of a Cr2AlC-coated superalloy

Cited by 44 publications

References 18 publications

Cr2AlC MAX phase as bond coat for thermal barrier coatings: Processing, testing under thermal gradient loading, and future challenges

Cr2AlC MAX phase as bond coat for thermal barrier coatings: Processing, testing under thermal gradient loading, and future challenges

Incipient low-temperature formation of MAX phase in Cr–Al–C films

Hot corrosion behavior of three different zones of linear friction welded Ti‐22Al‐25Nb alloy

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Product

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Cr₂AlC MAX phase as bond coat for thermal barrier coatings: Processing, testing under thermal gradient loading, and future challenges

Cr₂AlC MAX phase as bond coat for thermal barrier coatings: Processing, testing under thermal gradient loading, and future challenges