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Coatings 2017, 7(11), 186; https://doi.org/10.3390/coatings7110186

Study on the Formation of Reaction Phase to Si Addition in Boron Steel Hot-Dipped in Al–7Ni Alloy

1
Department of Hybrid Materials & Machining Technology, Graduate School of Convergence Science, Pusan National University, Busan 46241, Korea
2
Department of Material Science and Engineering, Pusan National University, Busan 46241, Korea
*
Author to whom correspondence should be addressed.
Academic Editor: Nelson K. Akafuah
Received: 17 October 2017 / Revised: 30 October 2017 / Accepted: 2 November 2017 / Published: 4 November 2017
(This article belongs to the Special Issue Innovative Coatings for Automotive Industry)
Full-Text   |   PDF [9585 KB, uploaded 4 November 2017]   |  

Abstract

In order to reduce the intermetallic compounds formed during the application of an Al–7Ni wt % hot-dip multifunctional coating on boron steel, developed for Tailor Welded Blanks (TWB) and hot stamping, 2–6 wt % Si was added to the coating to change the reaction layer. The coating was run at 690 °C for 120 s. Al9FeNi phases were formed on the steel interface, Fe2Al5 was formed on the steel, FeAl3 was generated between the existing layers, and flake-type Al2Fe3Si3 was formed in the Fe2Al5 phase, depending on the Si content. In addition, as Si was added to the coating, the thickness of the Fe2Al5 phase decreased and the thickness of the Al9FeNi phase and Al2Fe3Si3 increased. The decrease in the thickness of the Fe2Al5 phase was mainly due to the effect of the Si solid solution and the Al2Fe3Si3 formation in the Fe2Al5 phase. The reason for the growth of Al9FeNi is that the higher the Si content in the coating, the more the erosion of the interface of the steel material due to the coating solution. Therefore, the outflow of Fe into the coating liquid increased. View Full-Text
Keywords: hot-dipped coating; aluminized steel; Fe–Al–Ni phase; Fe–Al–Si phase; reduced intermetallics; advanced high-strength steel; Tailor Welded Blanks (TWB); hot-stamping hot-dipped coating; aluminized steel; Fe–Al–Ni phase; Fe–Al–Si phase; reduced intermetallics; advanced high-strength steel; Tailor Welded Blanks (TWB); hot-stamping
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Yun, J.-G.; Lee, J.-H.; Kwak, S.-Y.; Kang, C.-Y. Study on the Formation of Reaction Phase to Si Addition in Boron Steel Hot-Dipped in Al–7Ni Alloy. Coatings 2017, 7, 186.

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