基于聚焦离子束切割制样的热镀锌汽车钢板漏镀缺陷结构表征与成因分析

doi:10.11896/cldb.23080246

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Abstract Leakage defects are easily formed during the hot-dip galvanizing process of advanced high-strength automotive steel plates. It is generally believed that the segregation of alloy elements causes the leakage defects ranging from tens to hundreds of micrometers. These defects can be well characterized and analyzed through metallographic microscopy and scanning electron microscopy to determine their formation reasons. However, for leakage defects with sizes of several micrometers like pinhole leakage defects and other ones with attached structures, conventional plane or cross-sectional specimen observation cannot provide precise characterization, restricting the understanding of their formation mechanism. By adopting the focused ion beam (FIB) cutting technique, this work prepared cross-sectional samples at certain leakage defect positions of the galvanized layer of 780 MPa dual-phase steel automobile plate, and performed internal structure and composition distribution characterization at the defect-substrate interfaces via transmission electron microscopy. The results indicate that there are two types of micrometer-level leakage defects in the galvanized layer, of which the formation mechanism differs from the general understanding. The first type (type-Ⅰ) of leakage defects are caused by the tiny pit defects on the steel plate surface before galvanizing, and have internal interface layers’ phases and composition similar to those in the non-leakage area. The second type (type-Ⅱ) of leakage defects mainly originate from the surface residual iron particles detrimental to the normal galvanizing reaction, and have loose attached structures. Hence it is recommended to focus and reduce surface pit defects and remove surface residual iron particles at the rolling stage of steel plates in order to inhibit the formation of these two types of micrometer-level leakage defects in the galvanized layers of 780 MPa dual-phase steel and other advanced high-strength galvanized automotive steel plates.

Key words： hot-dip galvanizing dual-phase steel focusing ion beam cutting transmission electron microscopy leakage defect structure

Published: 25 February 2025 Online: 2025-02-18

CLC number:

TG174

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	Articles by authors
	WEI Langlang
	TIAN Xiugang
	LIANG Jian
	MIAO Bin
	YANG Feng
	LI Yang
	ZHENG Shijian

Cite this article:

WEI Langlang,TIAN Xiugang,LIANG Jian, et al. Characterization and Formation Mechanism Analysis of Leakage Defects in Hot-dip Galvanized Automotive Steel Plate Based on Focused Ion Beam Cutting Sample Preparation[J]. Materials Reports, 2025, 39(4): 23080246-7.

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https://www.mater-rep.com/EN/10.11896/cldb.23080246 OR https://www.mater-rep.com/EN/Y2025/V39/I4/23080246

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