GROWTH BEHAVIOR OF INTERMETALLIC LAYER ON STAINLESS STEEL IN ALUMINUM HOT-DIPPING PROCESS

Yuanxing Li, Qiang Jia, Zongtao Zhu, Wei Gao and Hui Chen
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Yuanxing Li: School of Materials Science and Engineering, Southwest Jiaotong University, Chengdu 610031, P. R. China
Qiang Jia: School of Materials Science and Engineering, Southwest Jiaotong University, Chengdu 610031, P. R. China
Zongtao Zhu: School of Materials Science and Engineering, Southwest Jiaotong University, Chengdu 610031, P. R. China
Wei Gao: School of Materials Science and Engineering, Southwest Jiaotong University, Chengdu 610031, P. R. China†Faculty of Engineering, The University of Auckland, BP 92019, Auckland 1142, New Zealand
Hui Chen: School of Materials Science and Engineering, Southwest Jiaotong University, Chengdu 610031, P. R. China

Surface Review and Letters (SRL), 2017, vol. 24, issue 04, 1-9

Abstract: A set of stainless steel plates were treated by hot-dipping into molten pure aluminum (Al) at 700∘C, 760∘C and 820∘C with different immersion time from 10s to 1800s. The growth behavior of the intermetallic compound layers between the substrate and Al coating is investigated. The intermetallic compounds showed a bi-layer structure consisting of FeAl3 close to Al coating and Fe2Al5 close to the substrate. The thickness of the intermetallic layers is closely related to the immersion time. Crack occurred with increasing immersion time and thickening Fe2Al5 layer. The thickness of the Fe2Al5 layers increases linearly with the square root of immersion time. Phase’s identification of each layer was confirmed using X-ray diffraction (XRD) analysis by grinding the specimens to expose different layers. The Fe2Al5 layer exhibited a single intensive peak attributable to (002) plane. The full width half maximum (Δω) of Fe2Al5 on stainless steel substrate is 11.99∘ by X-ray rocking curve measurement, suggesting that the Fe2Al5 grains have a strong orientation texture but not a single crystal. For comparison, Δω of Fe2Al5 formed on mild steel by hot-dipping is 14.12∘. The relationship between the Δω of Fe2Al5 layers and the growth mechanisms of crystals is discussed for the two steel substrates.

Keywords: Stainless steel; hot-dip aluminizing; intermetallic layer; X-ray rocking curve (search for similar items in EconPapers)
Date: 2017
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DOI: 10.1142/S0218625X17500469

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