Wear, Corrosion and Fatigue Behavior of Ni-Based Superalloys Coatings Deposited via Cold Spray

A special issue of Metals (ISSN 2075-4701). This special issue belongs to the section "Corrosion and Protection".

Deadline for manuscript submissions: closed (25 November 2020) | Viewed by 5821

Special Issue Editor


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Guest Editor
CPT - Centro de Proyección Térmica (Thermal Spray Center) - Universitat de Barcelona, Barcelona, Spain
Interests: Cold Spray; Additive Manufacturing; Stainless Steel; Ni Based Superalloy; Thermal Spray Process; Mechanical Properties; Fatigue Behavior; Corrosion; Wear.
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Special Issue Information

Dear Colleagues,

Cold spray technology could change the way that we design and make products. As a coating technology, it solves many of the inconveniences of traditional thermal spraying technologies, such as oxidation and phase transformations. As an additive manufacturing technology, it could be able to produce complex shapes that cannot be produced by traditional techniques. In aeronautics, energy, and many other sectors, many parts produced via cold spray are subject to an environment that can progressively wear out, corrode/erode, or strain the materials until fracture. Generally, Ni-based superalloys exhibit very high corrosion resistance and provide high strength and good machinability. For these reasons, they are increasingly used in modern industry. Therefore, the starting point of this Special Issue is the lack of information about the cold spray technology using Ni-based superalloys powders for wear, corrosion, and fatigue applications. Papers in this Special Issue are focused on how cold spray and Ni-based superalloys can be integrated into different industrial sectors and address the key drivers for innovation.

Dr. Alessio Silvello
Guest Editor

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Keywords

  • cold spray
  • Ni-based superalloys powders
  • coatings
  • additive manufacturing
  • wear
  • corrosion
  • fatigue
  • maintenance, repair, and overhaul

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Published Papers (2 papers)

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Research

13 pages, 7002 KiB  
Article
Wear and Fretting Behavior of Cold Sprayed IN625 Superalloy
by Pasquale Daniele Cavaliere, Antonella Rizzo, Daniele Valerini and Laura Capodieci
Metals 2021, 11(1), 49; https://doi.org/10.3390/met11010049 - 28 Dec 2020
Cited by 8 | Viewed by 1909
Abstract
The wear and fretting behaviour of IN625 cold spray coatings was analysed and the results are presented. The cold spray conditions were selected in order to obtain coatings with minimum porosity and maximum particles splat. This leads to compact and hard deposited material [...] Read more.
The wear and fretting behaviour of IN625 cold spray coatings was analysed and the results are presented. The cold spray conditions were selected in order to obtain coatings with minimum porosity and maximum particles splat. This leads to compact and hard deposited material able to resist wear damaging and to dissipate energy during fretting. The coating’s strength was evaluated through nanoindentation that revealed an increased hardness from the surface toward the substrate. This different hardening behaviour from the coating surface toward the substrate leads to increased resistance to fretting and wear as the maximum stresses increase. This was revealed by scratch tests performed at linearly increasing loads that allowed identifying of the damage mechanisms acting on the coating as the triaxial stresses increase. The hardening behaviour of the coating also influenced the fretting behaviour revealed by the weight loss experienced by varying the fretting maximum load. Full article
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14 pages, 7201 KiB  
Article
Alumina Reinforcement of Inconel 625 Coatings by Cold Gas Spraying
by Sergi Dosta, Nuria Cinca, Alessio Silvello and Irene G. Cano
Metals 2020, 10(9), 1263; https://doi.org/10.3390/met10091263 - 18 Sep 2020
Cited by 6 | Viewed by 3497
Abstract
Reinforced Inconel625 coatings have been successfully deposited by means of cold gas spray (CGS). Alumina has been simultaneously sprayed achieving a homogeneous distribution along the deposit with good cohesion between particles. The aim of this study was to investigate whether ceramic reinforcement could [...] Read more.
Reinforced Inconel625 coatings have been successfully deposited by means of cold gas spray (CGS). Alumina has been simultaneously sprayed achieving a homogeneous distribution along the deposit with good cohesion between particles. The aim of this study was to investigate whether ceramic reinforcement could improve the mechanical and tribological properties of Inconel625 cold-sprayed coatings, while keeping the oxidation and corrosion resistance capacity. Furthermore, alumina particles were found to improve the spraying feasibility, by avoiding WC nozzle clogging during the process. A proper optimization of the spraying conditions was carried out in order to obtain the lowest possible porosity and best embedment of the alumina. Then, the mechanical and tribological properties as well as corrosion and oxidation behavior were characterized. Alumina acts as a reinforcement, improving the effects of abrasive and sliding wear. Regarding the oxidation and corrosion behavior, the coatings exhibit reasonably good oxidation resistance at temperatures up to 900 °C. The electrochemical corrosion performance in NaCl solution showed potentially lower noble corrosion values and corrosion current densities than bulk Inconel. Full article
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