Next Article in Journal
Investigation of the Effects of an Intense Pulsed Ion Beam on the Surface Melting of IN718 Superalloy Prepared with Selective Laser Melting
Next Article in Special Issue
Effect of Zr Additions on Non-Metallic Inclusions in X11CrNiMo12 Steel
Previous Article in Journal
Selective Recovery of Tellurium from the Tellurium-Bearing Sodium Carbonate Slag by Sodium Sulfide Leaching Followed by Cyclone Electrowinning
Previous Article in Special Issue
Characterization of Coarse-Grained Heat-Affected Zones in Al and Ti-Deoxidized Offshore Steels
Article

Effect of Inclusions on the Corrosion Properties of the Nickel-Based Alloys 718 and EP718

1
Scientific and Technological Complex “New technologies and materials”, Institute of Advanced Engineering Technologies, Peter the Great Saint-Petersburg Polytechnic University, Polytechnicheskaya 29, 194064 Saint-Petersburg, Russia
2
Department of Materials Science and Engineering, School of Industrial Engineering and Management, KTH Royal Institute of Technology, Brinellvägen 23, 100 44 Stockholm, Sweden
*
Authors to whom correspondence should be addressed.
Metals 2020, 10(9), 1177; https://doi.org/10.3390/met10091177
Received: 17 July 2020 / Revised: 15 August 2020 / Accepted: 26 August 2020 / Published: 1 September 2020
(This article belongs to the Special Issue Inclusion/Precipitate Engineering in Steels)
Inclusions in steels and alloys are known to lower the resistance to deformation, as well as to lower the mechanical, corrosion and other properties. Studies of inclusions in nickel-based alloys are important since these materials could suffer from corrosion degradation in harsh operational conditions. This, in fact, could lead to a pitting initiation around the inclusions. Two industrial Ni-based alloys (alloy 718 and EP718) were investigated to determine the harmful effects of different inclusions on the corrosion resistance of Ni-based alloys. Specifically, the inclusion characteristics (such as composition, morphology, size, number and location) were determined for inclusions collected on film filters after electrolytic extraction and dissolution of a metal matrix around different inclusions on surfaces of metal samples after electrolytic extraction (EE). It was found that both Ni-based alloys contain various inclusion types: carbides (large size NbTi-C and small multicomponent carbides), nitrides TiNb-N and sulphides (TiNb-S in EP718 alloy). The most harmful effects on the corrosion resistance of metal were detected around sulphides and small carbides containing Mo, W, Cr. Dissolution effects were also observed around large carbides and nitrides, especially around inclusions larger than 10 µm. Moreover, the dissolution of a matrix around inclusions and clusters located on the grain boundaries were found to be 2.1–2.7 times larger compared to inclusions found inside of grains of the given alloy samples. View Full-Text
Keywords: nickel-based alloys; corrosion; inclusions; oil and gas industry; electrolytic extraction; alloy 718 nickel-based alloys; corrosion; inclusions; oil and gas industry; electrolytic extraction; alloy 718
Show Figures

Figure 1

MDPI and ACS Style

Alekseeva, E.; Karasev, A.; Jönsson, P.G.; Alkhimenko, A. Effect of Inclusions on the Corrosion Properties of the Nickel-Based Alloys 718 and EP718. Metals 2020, 10, 1177. https://doi.org/10.3390/met10091177

AMA Style

Alekseeva E, Karasev A, Jönsson PG, Alkhimenko A. Effect of Inclusions on the Corrosion Properties of the Nickel-Based Alloys 718 and EP718. Metals. 2020; 10(9):1177. https://doi.org/10.3390/met10091177

Chicago/Turabian Style

Alekseeva, Ekaterina; Karasev, Andrey; Jönsson, Pär G.; Alkhimenko, Aleksey. 2020. "Effect of Inclusions on the Corrosion Properties of the Nickel-Based Alloys 718 and EP718" Metals 10, no. 9: 1177. https://doi.org/10.3390/met10091177

Find Other Styles
Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Article Access Map by Country/Region

1
Search more from Scilit
 
Search
Back to TopTop