Cyclic oxidation behavior of a cobalt aluminide coating on Co-base superalloy AMS 5608

Lee, Jyh-Wei; Kuo, Yu-Chu

doi:10.1016/j.surfcoat.2005.07.082

Cited by 42 publications

(16 citation statements)

References 13 publications

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“…On the other hand, it was determined that Mn, W, and Fe are not included in the structure. EDS line analyses determined that the elements in the coating layer are in agreement with Lee et al's [24] findings and the XRD analysis findings shown in Figure 1.…”

Section: Xrd and Microstructure Analysessupporting

confidence: 87%

A Comparative Study on Characterization and High-Temperature Wear Behaviors of Thermochemical Coatings Applied to Cobalt-Based Haynes 25 Superalloys

Günen

Ergin

2023

Coatings

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This study investigated the characteristic properties of aluminizing, boronizing, and boro-aluminizing coatings grown on Haynes 25 superalloys and their effects on the high-temperature wear behavior. The coating processes were conducted in a controlled atmosphere at 950 °C for 3 h. Characterization studies were performed using scanning electron microscopy, energy-dispersive spectroscopy, X-ray diffraction analysis, nanoindentation testing, and high-temperature wear tests. It was determined that the thickness values of aluminide, boride, and boride–aluminide coatings were 140 ± 1.50 µm, 37.58 ± 2.85 µm, and 14.73 ± 1.71 µm, and their hardness values were 12.23 ± 0.9 GPa, 26.34 ± 2.33 GPa, and 23.46 ± 1.29 GPa, respectively. The hardness of the coatings resulted in reduced wear volume losses both at room temperature and at 500 °C. While the best wear resistance was obtained in the boronized sample at room temperature due to its high hardness, the best wear resistance at 500 °C was obtained in the boro-aluminized sample with the oxidation–reduction effect of Al content and the lubricating effect of B content in the boro-aluminide coating. This indicates that the presence of aluminum in boride layers improves the high-temperature wear resistance of boride coatings. The coated samples underwent abrasive wear at room temperature, whereas at 500 °C, the wear mechanism shifted to an oxidative-assisted adhesive wear mechanism.

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Section: Xrd and Microstructure Analysessupporting

confidence: 87%

A Comparative Study on Characterization and High-Temperature Wear Behaviors of Thermochemical Coatings Applied to Cobalt-Based Haynes 25 Superalloys

Günen

Ergin

2023

Coatings

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“…Aluminide diffusion coatings are classically deposited from a powder (cement) composed of an activator (NH 4 Cl), a metallic donor (Al) and an inert filler (Al 2 O 3 ) [262][263][264][265][266][267][268]. The aluminisation process is performed on steels [244,246,247,[269][270][271][272][273], superalloys [274][275][276][277][278][279][280][281], non-ferrous metals [282][283][284], etc. Figure 10.17 illustrates the high temperature oxidation behaviour of an aluminide diffusion coating made of an (Fe,Cr) 3 Al and (Fe,Cr)Al mixture and performed on an Fe-30Cr model alloy [285].…”

Section: Aluminide Diffusion Coating Performance In Oxidising Atmosphmentioning

confidence: 99%

Formation and growth of protective alumina scales

Chevalier

2008

Developments in High Temperature Corrosion and Protection of Materials

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“…It is known that aluminide layers increase high temperature oxidation of Ni-based alloys. Therefore, several attempts were made to produce aluminide layers on Co-based alloys, e.g., on Haynes 188 and WI-52 [36], and also to study the oxidation resistance of alloys such as AMS 5608 with an aluminide layer produced by pack-cementation [37] or DZ40M with aluminide layer made by low pressure chemical vapor deposition (LP-CVD) [38]. Among Co-based alloys, the family MAR M-509 is one of the most popular for high-temperature application.…”

Section: Introductionmentioning

confidence: 99%

Increase in Oxidation Resistance of MAR M-509 via LA-CVD Aluminizing

et al. 2021

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Due to their excellent mechanical properties, Co-based alloys are one of the main candidates to replace Ni-based alloys in high temperature application. Knowledge about oxidation resistance of Co-based alloy MAR M-509 and the extent of its aluminizing on its oxidation resistance is limited. Therefore, in the present study, an aluminide layer was manufactured by low activity chemical vapor deposition (LA-CVD) on MAR M-509. Aluminized and uncoated alloys were investigated in terms of oxidation kinetics and oxidation resistance during isothermal and cyclic oxidation at 1000 and 1100 °C. Material in the as-cast and after exposure was analyzed using scanning electron microscopy (SEM), thermogravimetry (TG) and glow-discharge optical emission spectrometry (GD-OES). Obtained results allowed for elucidating of degradation mechanism including nitridation process of carbides for MAR M-509. It was found that aluminizing of MAR M-509 significantly decreases its oxidation kinetics by the factor of 2.5 and 1.5 at 1000 and 1100 °C respectively. Moreover, the suppression of identified degradation mechanism in case of aluminized alloy was found until occurrence of breakaway oxidation of the aluminide layer. It was also proposed that further increase in oxidation resistance can be successively achieved by an increase in aluminide layer thickness.

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Cyclic oxidation behavior of a cobalt aluminide coating on Co-base superalloy AMS 5608

Cited by 42 publications

References 13 publications

A Comparative Study on Characterization and High-Temperature Wear Behaviors of Thermochemical Coatings Applied to Cobalt-Based Haynes 25 Superalloys

A Comparative Study on Characterization and High-Temperature Wear Behaviors of Thermochemical Coatings Applied to Cobalt-Based Haynes 25 Superalloys

Formation and growth of protective alumina scales

Increase in Oxidation Resistance of MAR M-509 via LA-CVD Aluminizing

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