Low-temperature aluminizing influence on degradation of nimonic 80A surface: Microstructure, wear and high temperature oxidation behaviors

Erdoğan, Azmi; Yener, Tuba; Döleker, Kadir Mert; Korkmaz, Mehmet Erdi; Gök, Mustafa Sabri

doi:10.1016/j.surfin.2021.101240

Cited by 19 publications

(9 citation statements)

References 54 publications

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“…Fe, Cr, Ni, Mn) continued to diffuse outward to formed the mixed oxides, which replaced γ-Al 2 O 3 in Al-depletion zone. During this stage, different diffusion coe cients of elements and the change of products led to the formation of pores and cracks at the interface between oxide lm and aluminized layer [43]. Similar results were reported by Barekatain et al [44].…”

Section: The Oxidation Mechanism Of Specimenssupporting

confidence: 82%

Effect of aluminizing and laser shock peening on high temperature oxidation resistance of AISI 321 stainless steel for solar thermal power generation heat exchanger

Qin

Jiang

et al. 2023

Preprint

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The high-temperature oxidation resistance of AISI 321 stainless steel for solar thermal power generation heat exchanger highly determines its service life. Therefore, in this work, aluminizing treatment and aluminizing with subsequent laser shock peening (LSP) were employed to improve the high-temperature oxidation resistance of AISI 321 stainless steel at 620°C. The results showed that these two treatments decreased the oxidation rate as compared to the base AISI 321 steel. Concretely, the optimal oxidation resistance was observed in the aluminized steel before an oxidation testing time of 144 h due to the increased the entropy of the LSP-treated specimen. After 144 h, however, the LSP-treated sample showed the best oxidation resistance because of the formation of protective α-Al2O3. For the LSP-treated samples, the large amount of sub-grain boundaries formed on aluminized layer could act as the fast short-circuit path for the outward diffusion of Al element, facilitating the rapid nucleation of α- Al2O3. Meanwhile, the aluminized layer is able to isolate the contact between oxidation environment and matrix, thereby decreasing the oxidation rate. Further, the oxidation parabolic constant D(t) of LSP-treated steel was calculated to be minimum (6.45787×10–14), which is respectively 69.18% and 36.36% of aluminized steel and 321 steel during the whole oxidation process. Consequently, the combination of aluminizing and LSP can better improve the high-temperature oxidation resistance of 321 stainless steel.

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Section: The Oxidation Mechanism Of Specimenssupporting

confidence: 82%

Effect of aluminizing and laser shock peening on high temperature oxidation resistance of AISI 321 stainless steel for solar thermal power generation heat exchanger

Qin

Jiang

et al. 2023

Preprint

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“…Then, the samples were subjected to ultrasonic cleaning with an alcohol bath for 15 minutes. Previous studies [52,54] show that the aluminization process comprises 30% Al, 7.5% NH4Cl, and 62.5% Al2O3 powder mixtures by weight. To form the aluminide layer, the samples were placed in stainless steel crucibles, with each piece surrounded by a layer of aluminizing powder 10 mm thick on all sides.…”

Section: Sample Preparation and Coatingmentioning

confidence: 99%

“…However, it should be noted that pack-aluminizing is a pretty cheap diffusion coating among these techniques [53] and can be effectively applied to various sizes and geometries. Many researchers have used the pack-aluminizing process for its advantages [54]. The packaluminizing process has been used to overcome corrosion and wear issues of different materials subjected to various working and environmental conditions [44,53,55].…”

Section: Introductionmentioning

confidence: 99%

Enhancement of Marine Corrosion and Tribocorrosion Resistance of Offshore Mooring Chain Steel by Aluminizing Process

Alkan

2022

Brodogradnja

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The safety of mooring systems and accessories is one of the most critical issues in the structural integrity of floating oil/gas and renewable offshore structures. Mooring chains and accessories operate under dynamic conditions in harsh marine environments. They are subject to severe wear and corrosion between their links due to relative movement from waves, wind, and ocean currents that disrupt structural integrity. To cope with this problem, the pack-aluminizing process was applied on the R4 grade offshore mooring chain steel for 2 h at 850 °C to improve corrosion and wear-corrosion (tribocorrosion) resistance in 3.5% NaCl. The tribocorrosion behaviour of untreated and aluminized samples was investigated by a tribo-electrochemical setup that simultaneously allows for collecting the wear and corrosion data. Potentiodynamic and potentiostatic corrosion and tribocorrosion tests were carried out to understand corrosion kinetics. Optical, SEM, XRD and EDS analyses were performed to characterize the aluminide layer and surface morphologies before and after tribocorrosion investigations. In polarization scans under corrosion and tribocorrosion conditions, the current showed a significant activation stretch of several orders of magnitude, with minor potential changes in the anodic region. Due to the galvanic effects of sliding under natural electrochemical conditions, the untreated R4 alloy exhibited cathodic properties in the wear track, while the aluminium coating was out of the wear track due to its oxide-forming ability. At the cathodic potential, two hard Al2O3 materials under pure mechanical effects and third bodies emerging from cracks on the coating surface increase the friction coefficient (COF), while the oxide product film, which has a lubricating ability and pits which reduces the contact area, caused a decrease in COF at the high anodic potential. The study revealed that while the aluminide layer improved the corrosion and tribological character of R4 alloy, material loss from wear track increased due to micro fractures and cracks in the coating layer during sliding tribocorrosion conditions.

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“…Nimonic 80A is a nickel-based superalloy renowned for its exceptional high-temperature strength [1,2], oxidation resistance [3], and creep resistance, making it a prime choice for demanding engineering applications [4], particularly in the aerospace and gas turbine industries [5]. Nimonic 80A alloy typically exhibits a yield strength ranging from 550 to 690 MPa, along with an ultimate tensile strength between 750 and 950 MPa.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of the Surface Topography of Microfinishing Abrasive Films in Relation to Their Machining Capability of Nimonic 80A Superalloy

Tandecka,

Kacalak,

Szafraniec

et al. 2024

Materials

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This study investigates the surface topography of microfinishing abrasive films and their machining capability on the Nimonic 80A superalloy, a high-performance nickel-based alloy commonly used in aerospace and gas turbine engine applications. Surface analysis was conducted on three abrasive films with nominal grain sizes of 30, 15, and 9 μm, exploring wear patterns, contact frequency, and distribution. To assess the distribution of grain apexes, Voronoi cells were employed. Results revealed distinct wear mechanisms, including torn abrasive grains and cracked bond surfaces, highlighting the importance of efficient chip removal mechanisms in microfinishing processes. Larger grain sizes exhibited fewer contacts with the workpiece but provided more storage space for machining products, while smaller grain sizes facilitated smoother surface finishes. The research demonstrated the effectiveness of microfinishing abrasive films in reducing surface irregularities. Additionally, surface analysis of worn abrasive tools provided insights into wear mechanisms and chip formation, with the segmentation of microchips contributing to efficient chip removal. These findings underscore the significance of selecting appropriate abrasive films and implementing effective chip removal mechanisms to optimize microfinishing processes and improve surface finishing quality in advanced material machining applications. It is worth emphasizing that no prior research has investigated the microfinishing of components crafted from Nimonic 80A utilizing abrasive films, rendering this study truly unique in its contribution to the field.

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Low-temperature aluminizing influence on degradation of nimonic 80A surface: Microstructure, wear and high temperature oxidation behaviors

Cited by 19 publications

References 54 publications

Effect of aluminizing and laser shock peening on high temperature oxidation resistance of AISI 321 stainless steel for solar thermal power generation heat exchanger

Effect of aluminizing and laser shock peening on high temperature oxidation resistance of AISI 321 stainless steel for solar thermal power generation heat exchanger

Enhancement of Marine Corrosion and Tribocorrosion Resistance of Offshore Mooring Chain Steel by Aluminizing Process

Evaluation of the Surface Topography of Microfinishing Abrasive Films in Relation to Their Machining Capability of Nimonic 80A Superalloy

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