Development and characterization of an iron aluminide coating on mild steel substrate obtained by friction surfacing and heat treatment

Iron aluminides are intermetallic Fe–Al alloys known for their high temperature corrosion and oxidation resistance, which makes them candidate materials for high temperature applications. In the present work, the formation of an iron aluminide layer on a mild steel substrate by friction stir surfaci...

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Bibliographic Details
Published in:International journal of advanced manufacturing technology 2020-12, Vol.111 (9-10), p.2569-2576
Main Authors: Troysi, Fernanda D., Brito, Pedro P.
Format: Article
Language:English
Subjects:
Alloys
Aluminum base alloys
CAE) and Design
Coatings
Computer-Aided Engineering (CAD
Corrosion resistance
Electrochemical corrosion
Engineering
Ferrous alloys
Friction
Heat treating
Heat treatment
High temperature
Industrial and Production Engineering
Intermetallic compounds
Iron aluminides
Low carbon steels
Materials selection
Mechanical Engineering
Media Management
Original Article
Oxidation resistance
Substrates
Surfacing
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Summary:Iron aluminides are intermetallic Fe–Al alloys known for their high temperature corrosion and oxidation resistance, which makes them candidate materials for high temperature applications. In the present work, the formation of an iron aluminide layer on a mild steel substrate by friction stir surfacing of aluminium alloy AA6351 followed by isothermal heat treatment is reported. After Al-alloy deposition, the samples were subjected to annealing at temperature of 500, 550, 600 and 650 °C for various times up to 120 h. Microstructure analyses conducted by XRD and SEM/EDS indicated the formation of a homogenous layer of Fe 2 Al 5 with average hardness value of 1070 HV for a 72-h treatment at 650 °C. The electrochemical corrosion behaviour of the developed coatings was analysed, and it was possible to show that friction stir surfacing followed by heat treatment constitutes an effective processing route for obtaining iron aluminide coatings on conventional steel substrates.
ISSN:0268-3768
1433-3015
DOI:10.1007/s00170-020-06310-w