Influence of Alloying Elements on Interfacial Layer- and Galvanized Layer-Structure of New Hot-dip Galvanized Dual-phase Steel

doi:10.11901/1005.3093.2023.424

Chinese Journal of Materials Research

2024, Vol. 38

Issue (6): 446-452 DOI: 10.11901/1005.3093.2023.424

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Influence of Alloying Elements on Interfacial Layer- and Galvanized Layer-Structure of New Hot-dip Galvanized Dual-phase Steel

LI Yuanyuan¹, LIANG Jian¹, XIONG Ziliu², MIAO Bin¹(

), TIAN Xiugang³, QI Jianjun⁴, ZHENG Shijian¹(

)

^1.School of Materials Science and Engineering, Hebei University of Technology, Tianjin 300401, China
^2.HBIS Material Technology Research Institute, Shijiazhuang 050023, China
^3.Technical Center of Tangshan Iron and Steel Group Co. Ltd., Tangshan 063000, China
^4.HBIS Co. Ltd., Shijiazhuang 050023, China

Cite this article:

LI Yuanyuan, LIANG Jian, XIONG Ziliu, MIAO Bin, TIAN Xiugang, QI Jianjun, ZHENG Shijian. Influence of Alloying Elements on Interfacial Layer- and Galvanized Layer-Structure of New Hot-dip Galvanized Dual-phase Steel. Chinese Journal of Materials Research, 2024, 38(6): 446-452.

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Abstract

Hot-dip galvanized dual-phase steel DP980 samples were prepared by adhesive method, and their cross-sections were characterized by TEM. The interface layer structure and zinc coating structure were characterized by TEM combined with SAED and EDS. Then spatial morphology and composition distribution of the interfacial layer and galvanized layer was figured. The results indicated that unlike DP780, which mainly undergoes external oxidation of Mn during the annealing stage, DP980 mainly undergoes internal oxidation. Due to the presence of Cr, its oxidation competes with that of Mn. Less MnO in the interface layer may facilitate the Fe-Al reaction in the hot galvanizing process, forming a continuous and dense Fe₂Al₅ inhibiting layer, which can effectively inhibit the Fe-Zn reaction in the galvanizing stage. This is the main reason why DP980 has good hot dip galvanizing performance. In addition, this structure leads to the formation of Fe₃Zn₁₀ nanocrystals dispersed in the η-Zn matrix. This can avoid the formation of a galvanized layer structure containing large size of brittle Fe-Zn phase, which is beneficial for DP980 to maintain good mechanical properties.

Key words: surface and interface in the materials galvanized dual-phase steel microstructure characterization selective oxidation interface layer structure galvanized layer structure

Received: 28 August 2023

ZTFLH:

TG174

Fund: National Natural Science Foundation of China(52101013);the Central Guidance on Local Science and Technology Development Fund of Hebei Province(226Z1012G);HBIS Material Technology Research Institute(HG2021104,HG2021123)

Corresponding Authors: MIAO Bin, Tel: 13167361369, E-mail: miaobin@hebut.edu.cn
ZHENG Shijian, Tel: 13654039173, E-mail: sjzheng@hebut.edu.cn

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	LI Yuanyuan
	LIANG Jian
	XIONG Ziliu
	MIAO Bin
	TIAN Xiugang
	QI Jianjun
	ZHENG Shijian

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https://www.cjmr.org/EN/10.11901/1005.3093.2023.424 OR https://www.cjmr.org/EN/Y2024/V38/I6/446

Fig.1 Schematic diagram of sample preparation for TEM section characterization of galvanized dual phase steel

Fig.2 STEM-EDS of the interfacial layer of the galvanized DP980

Fig.3 Phases of galvanized DP980 (a) the BF-TEM image of the interfacial layer; (b) CBED pattern of the Mn oxide in the interfacial layer; (c) the SAED patterns of the Fe-Al phase in the interfacial layer

Fig.4 Phase in the galvanized coating of low Al galvanized DP980 (a) BF-TEM image of the galvanized coating; (b) SAED diffraction pattern of the galvanized coating on the side near the interfacial layer (as shown in Fig.4a, yellow circle marking area 1); (c) SAED diffraction pattern of the galvanized coating on the side away from the interfacial layer (as shown in Fig.4a, red circle marking area 2); (d) the DF-TEM image of the galvanized coating taken from (0002) diffraction spot as shown in Fig.4c; (e) the DF-TEM image of the galvanized coating taken from part of (411) diffraction ring as shown in Fig.4c

Fig.5 STEM-EDS of the interfacial layer and the galvanized coating of low Al galvanized DP980

Fig.6 Schematic diagram of the distribution of oxides of galvanized DP780 (a) and galvanized DP980 (b)

Fig.7 Schematic diagram of the interfacial layer and galvanized coating of galvanized DP780 (a) and galvanized DP780 (b)

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