Investigation of diffusion annealing processes of steels with multi-layer Ni–Al coating
https://doi.org/10.17073/1997-308X-2019-2-68-74
Abstract
Ni–Al intermetallics have high heat resistance and therefore they are used as coatings for steel parts running under high temperature conditions. A method for liquid-phase aluminizing of preliminary nickel-plated steel samples followed by diffusion annealing was offered to form such coatings. Liquid-phase aluminizing can form the second aluminum layer on the nickel-plated steel and diffusion annealing provides formation of a coating based on Ni–Al intermetallics. Diffusion annealing (t = 650÷850 °C, τ = 1, 2 and 5 hours) was done at samples coated with aluminum at 750 °С. It was found that the technology offered ensures forming surface intermetallic layers with a thickness depending on the temperature and time of annealing. Annealing at 650÷800 °С during 1÷5 hours provides forming mainly up to 50–140 μm thick Ni2Al3 layer, while NiAl and Ni3Al layers featuring the highest heat resistance are formed at 850 °С during 5 hours. The heat resistance of these coatings showed that due to refractory NiAl layer formation on the surface, the sample resists to failure at a testing temperature of 750 °С during 300 hours.
About the Authors
A. I. Kovtunov
Togliatti State University
Russian Federation
Russian Federation
Dr. Sci. (Tech.), Prof., Department «Welding, metal forming and related processes»
445020, Russia, Togliatti, Belorusskaya str., 14
A. M. Ostryanko
Togliatti State University
Russian Federation
Russian Federation
Master’s student, Department «Welding, metal forming and related processes»
445020, Russia, Togliatti, Belorusskaya str., 14
О. V. Shashkin
Togliatti State University
Russian Federation
Russian Federation
Cand. Sci. (Tech.), Prof., Department «Welding, metal forming and related processes»
445020, Russia, Togliatti, Belorusskaya str., 14
Т. V. Semistenova
Togliatti State University
Russian Federation
Russian Federation
Cand. Sci. (Tech.), Prof., Department «Management of industrial and environmental safety»
445020, Russia, Togliatti, Belorusskaya str., 14
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Review
For citations:
Kovtunov A.I., Ostryanko A.M., Shashkin О.V., Semistenova Т.V. Investigation of diffusion annealing processes of steels with multi-layer Ni–Al coating. Powder Metallurgy аnd Functional Coatings (Izvestiya Vuzov. Poroshkovaya Metallurgiya i Funktsional'nye Pokrytiya). 2019;(2):68-74. (In Russ.) https://doi.org/10.17073/1997-308X-2019-2-68-74
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