Effect of Al Content on the Microstructure of Hot-Depped Zinc Coating on Hot Stamping Steel

doi:10.11901/1005.3093.2013.548

Chinese Journal of Materials Research

2014, Vol. 28

Issue (1): 23-30 DOI: 10.11901/1005.3093.2013.548

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Effect of Al Content on the Microstructure of Hot-Depped Zinc Coating on Hot Stamping Steel

Honglin YANG¹,Shengen ZHANG^1,^**(

),Jiyao HONG²,Xin LIU²,Jun LI²,Hua WANG³

1. School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083
2. Central Research Institute of Baosteel, Shanghai, 201900
3. School of Materials Science and Engineering, Shanghai University, Shanghai 200072

Cite this article:

Honglin YANG,Shengen ZHANG,Jiyao HONG,Xin LIU,Jun LI,Hua WANG. Effect of Al Content on the Microstructure of Hot-Depped Zinc Coating on Hot Stamping Steel. Chinese Journal of Materials Research, 2014, 28(1): 23-30.

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Abstract

Different galvanized coatings on hot stamping steel was obtained by using hot dip galvanizing simulation experiment device dipping in zinc baths with four different Al contents. The effect of Al content on the microstructure of galvanized was investigated using SEM/EDS and glow discharge optical emission spectrometer (GDOES).The results show that press-hardened steel has good reactive wetting in different Al content zinc bath. The Al content (mass fraction) in zinc bath has a significant influence on coating/steel interface composition, morphology and light property. Enrichment of Mn, Si elements occurred in the steel surface during bright annealing process, and the Mn-Si oxides react (redox reaction) with Al in zinc bath. For 0.11% dissolved Al bath, continuous ζ phases formed at the coating/steel interface. For 0.17% dissolved Al bath, the coating/steel interface consist of ζ phases and Fe-Al phases. A continuous Fe₂Al₅ inhibition layer achieved in baths with Al content 0.25% and 0.43%, and the morphology of interface layer became coarser when Al content in zinc bath was 0.25%. In addition, with the increase of Al content in zinc bath, the light property of zinc coatings gradually became worse.

Key words: metallic materials press-hardened steel galvanizing inhibition layer selective oxidation

Received: 30 July 2013

Fund: *Supported by National Key Basic Research and Development Program of China No.2012CB723904.

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	Honglin YANG
	Shengen ZHANG
	Jiyao HONG
	Xin LIU
	Jun LI
	Hua WANG

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https://www.cjmr.org/EN/10.11901/1005.3093.2013.548 OR https://www.cjmr.org/EN/Y2014/V28/I1/23

Fig.1 Annealing curve used in this study

Fig.2 SEM micrograph of sample surface after bright annealing and EDS analysis of oxide

Fig.3 GDOES depth profiles of steel surface after annealing at 800℃/60 s in DP -30℃ and 5%H₂+95%N₂

Fig.4 Macro morphologies of galvanized coatings with different contents of Al

Fig.5 Depth profiles of Al on the surface of various zinc coatings

Fig.6 SEM images of the steel/coating interface with different contents of Al in Zinc bath (a) 0.11%Al, (b) 0.17% Al,(c) 0.25% Al, (d) 0.43% Al

Table 1 Corresponding results of EDS analysis of different area in Fig.6 (mass fraction, %)

Fig.7 BES micrographs of galvanized coatings with different contents of Al, (a) 0.11%Al, (b) 0.17% Al, (c) 0.25% Al, (d) 0.43% Al

Fig.8 GDOES depth profiles of different elements with various Al contents coatings, (a) 0.11%Al, (b) 0.17% Al, (c) 0.25% Al,（d）0.43% Al

Fig.9 Schematics of the morphologies of the interfacial layer formed in coatings with different Al contents, (a) 0.11%Al, (b) 0.17% Al, (c) 0.25% Al, (d) 0.43% Al

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