Formation of Intermetallic Coating on 20880 Steel in the Liquid-Phase Inter-Reaction with Aluminum

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Abstract:

The inter-reaction mechanism of ingot iron with a molten aluminum is proposed and experimentally confirmed. It is shown that the three-layer coating is formed on the surface of ingot iron under the conditions of liquid-phase inter-reaction and consists of bund interlayers of Fe2Al5 and FeAl3 intermetallics and a heterogeneous structure based on solid solution and FeAl3. The micro-hardness of the structural components of the heterogeneous structure ranges from 1 (for Al (Fe)) to 6–9 GPA (for FeAl3+Al (Fe)). An increase in the exposure time during the heat treatment is accompanied by an increase of the quantity of structurally free FeAl3+Al (Fe) fragments in its composition.

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Solid State Phenomena (Volume 299)

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914-919

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January 2020

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