Fracture Failure of Zinc-Plated Hub Bolts by Hydrogen Embrittlement

被引：3

作者：

Xu N. ^{[1
]}

Ding N. ^{[1
,2
]}

Shi J. ^{[1
]}

Guo W. ^{[1
]}

Wu C.-M.L. ^{[1
,2
]}

机构：

[1] Research Center of Failure Analysis and Engineering Safety Assessment, Shandong Academy of Sciences, Jinan

[2] Department of Physics and Materials Science, City University of Hong Kong, Hong Kong SAR

来源：

Journal of Failure Analysis and Prevention | 2015年 / 15卷 / 04期

基金：

中国国家自然科学基金;

关键词：

Fracture; Hub bolt; Hydrogen embrittlement; Zinc plating;

D O I：

10.1007/s11668-015-9972-1

中图分类号：

学科分类号：

摘要：

In this work, the failure behavior of a batch of zinc-plated hub bolts with high strength was detected and analyzed to determine the failure mechanism. The fracture failure occurred at the head-to-shank transition. The initial region of the crack was at the external edge of the bolts. Brittle fractures containing intergranular and transgranular features were observed using a scanning electron microscope. Yawning grain boundaries as well as micropores on the grain surfaces were observed at many areas of the fracture surfaces. According to the analysis results, hydrogen embrittlement is considered as the probable mechanism of the failed specimens. Poor baking treatment may be the reason leading to the incomplete removal of hydrogen. © 2015, ASM International.

引用

页码：464 / 469

页数：5

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