Aerospace Alloys

Gialanella, Stefano; Malandruccolo, Alessio

doi:10.1007/978-3-030-24440-8

Cited by 72 publications

(49 citation statements)

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“…In 2012, Hoeppner and Arriscorreta published a review addressing studies about exfoliation and pitting corrosion [20]. An article proposed by Gialanella [21] investigated the corrosion of aluminum, magnesium, and other alloys used in aircraft structures exposed to standard service environmental conditions and high temperatures. Gialanella concluded that changes occur in the structural and aerodynamic properties of turbines.…”

Section: Introductionmentioning

confidence: 99%

Aircraft Fuselage Corrosion Detection Using Artificial Intelligence

Brandoli

Geus

Souza

et al. 2021

Sensors

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Corrosion identification and repair is a vital task in aircraft maintenance to ensure continued structural integrity. Regarding fuselage lap joints, typically, visual inspections are followed by non-destructive methodologies, which are time-consuming. The visual inspection of large areas suffers not only from subjectivity but also from the variable probability of corrosion detection, which is aggravated by the multiple layers used in fuselage construction. In this paper, we propose a methodology for automatic image-based corrosion detection of aircraft structures using deep neural networks. For machine learning, we use a dataset that consists of D-Sight Aircraft Inspection System (DAIS) images from different lap joints of Boeing and Airbus aircrafts. We also employ transfer learning to overcome the shortage of aircraft corrosion images. With precision of over 93%, we demonstrate that our approach detects corrosion with a precision comparable to that of trained operators, aiding to reduce the uncertainties related to operator fatigue or inadequate training. Our results indicate that our methodology can support specialists and engineers in corrosion monitoring in the aerospace industry, potentially contributing to the automation of condition-based maintenance protocols.

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Section: Introductionmentioning

confidence: 99%

Aircraft Fuselage Corrosion Detection Using Artificial Intelligence

Brandoli

Geus

Souza

et al. 2021

Sensors

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“…The superalloys are high-temperature materials that display excellent resistance to mechanical and chemical degradation at temperatures close to their melting points [1,2].…”

Section: Introductionmentioning

confidence: 99%

“…A modern jet airplane could not fly without them. Further improvements in temperature capability are now actively sought, e.g., the engines can power the two-decked Airbus A380 and the Boeing 787 Dreamliner [1,[3][4][5][6][7].…”

Section: Introductionmentioning

confidence: 99%

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Frequency Analysis of Transients in Electrochemical Noise of Superalloys Waspaloy and Ultimet

Jáquez-Muñoz

Gaona‐Tiburcio

Miramontes

et al. 2021

Metals

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Nickel or Cobalt-based superalloys represent an important class of engineering materials, finding widespread application in critical components within the gas turbine engines used for jet propulsion and electricity generation. This research aimed at the frequency analysis of transients in electrochemical noise of Waspaloy and Ultimet superalloys, immersed in 3.5 wt.% in H2SO4 and NaCl solutions at two different temperatures, 25 and 60 °C. Localized corrosion behavior of superalloys was assessed using the electrochemical noise technique (EN) according to ASTM-G199 standard. Three different statistical methods filtered the EN signal, and the polynomial method was employed to obtain the noise resistance (Rn), the localization index (LI), skew and kurtosis, and the power spectral density analysis (PSD). Results indicate that the current and potential noise transients have a better behavior with better clarity when a polynomial is used to show a localized corrosion kurtosis for both superalloys.

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“…However, concentrated FCC solid solutions retain -in many cases -limited mechanical properties for temperatures up to 800°C, with yield strengths close to 100 MPa and ultimate tensile strengths down to 200 MPa [10]. Those numbers are far from many requirements, especially if one considers structural applications in aerospace industry [22]. New microstructures are thus required to significantly improve high temperature (HT) mechanical properties of the concentrated alloys.…”

Section: Introductionmentioning

confidence: 99%

Study of the FCC+L12 two-phase region in complex concentrated alloys based on the Al–Co–Cr–Fe–Ni–Ti system

et al. 2020

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New face-centered cubic (FCC) multicomponent alloys designed through the high-entropy (HEA) concept and strengthened with L12 ordered precipitates are promising material solutions for high temperature (HT) structural applications. However, as the design strategy is based on multi-principal elements, the research of alloy compositions exhibiting a stable and well-controlled FCC+L12 microstructure at HT is particularly challenging. Among the critical issues, those relative to the extent and the stability of the FCC+L12 two-phase region in the wide compositional space have to be addressed. Here, we performed high-throughput Calphad calculations in the senary Al-Co-Cr-Fe-Ni-Ti system in the 800°C-1000°C range to screen alloy compositions exhibiting duplex FCC+L12 microstructures. From the 79 695 analyzed compositions, we show that roughly 6% of the total own duplex microstructure at 800°C and 1000°C. Calculations suggest that Cr and Fe additions destabilize the two-phase region. Interestingly we found that Fe is a good candidate to substitute Co or Ni in the FCC phase and potentially induce some solid solution strengthening effects. Finally, the present results allow to propose an original 2D visualization method of the two-phase FCC+L12 region in the complex compositional space. The method is based on the relative influence of the alloying elements on the formation of such microstructure. To assess the reliability of calculations, six alloys were designed and characterized. A good agreement is found between predictive calculations and experimental results except for Cr-and Al-free alloy compositions in the quaternary Co-Fe-Ni-Ti system, due to the absence of description of the τ phase with (Ni0.5Co0.5)3Ti composition in the selected thermodynamic database.

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Aerospace Alloys

Cited by 72 publications

References 0 publications

Aircraft Fuselage Corrosion Detection Using Artificial Intelligence

Aircraft Fuselage Corrosion Detection Using Artificial Intelligence

Frequency Analysis of Transients in Electrochemical Noise of Superalloys Waspaloy and Ultimet

Study of the FCC+L12 two-phase region in complex concentrated alloys based on the Al–Co–Cr–Fe–Ni–Ti system

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