Features of Diffusion Interaction in Steel-Aluminum Composite After Explosive Welding and Aluminizing by Melt Immersion


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Abstract

Diffusion interaction at an interlayer boundary of St3 steel–AD1 aluminum after explosive welding and aluminizing by melt immersion is investigated. Test heat treatment regimes are revealed providing formation of coatings based on iron aluminides on a steel surface. It is shown that in order to form Fe2Al5 intermetallic on a steel surface with the hardness of 10 GPa, an explosion welded steel-aluminum composite must be given double heat treatment. After the first (660 °С, 3 h) a two-layer (Fe2Al5 and FeAl3) diffusion zone is formed, and after the second (640 °С, 3 h) it is destroyed along a main crack between the Fe2Al5 and FeAl3 interlayers. In order to form an Fe2Al5 intermetallic coating on a steel surface an aluminized layer obtained by melt immersion must be heat treated at 800 °C. Doping the diffusion zone with Si leads to the appearance of additional phases Al7Fe2Si and (Al, Si)5Fe3 within the composition, and an increase heat treatment duration leads to a reduction in coating hardness to 7.5–8 GPa.

About the authors

V. G. Shmorgun

FGBOU VO Volgograd State Technical University

Author for correspondence.
Email: mv@vstu.ru
Russian Federation, Volgograd

O. V. Slautin

FGBOU VO Volgograd State Technical University

Email: mv@vstu.ru
Russian Federation, Volgograd

V. P. Kulevich

FGBOU VO Volgograd State Technical University

Email: mv@vstu.ru
Russian Federation, Volgograd

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