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http://dx.doi.org/10.3365/KJMM.2011.49.1.001

Measurement Method of Sensitivity for Hydrogen Embrittlement of High Strength Bolts  

Ham, Jong-Oh (Metallic Materials Team, Korea Testing and Research Institute)
Kim, Bok-Gi (Metallic Materials Team, Korea Testing and Research Institute)
Lee, Sun-Ho (Materials & Nanotech Standards Divison, Korea Agency for Technology and Standards)
Publication Information
Korean Journal of Metals and Materials / v.49, no.1, 2011 , pp. 1-8 More about this Journal
Abstract
To measure the sensitivity of the hydrogen embrittlement from plated high strength bolts (SWCH18A, F11T), the bolt was stressed by a corresponding to the amount of tensile strain of 5% and 20%, and then the bolt developed a crack on the surface. The bolt that didn't have concentrated hydrogen, even though it was stressed by a corresponding the amount of tensile strain of 5% and 20%, no crack developed. However, the bolt that had concentrated hydrogen, developed cracks from the thread crest to the root. It is impossible to measure the hydrogen amount from plated high strength bolts using Hydrogen-Determinator, because of the limitation of the minimum sample size (about 1g as a mass or $5{\times}5{\times}5 mm^3$ as a volume). Therefore, the sensitivity of hydrogen embrittlement can be measured by observing the presence of cracks on the surface of plated high strength bolts which are stressed by a corresponding to the amount of tensile strain of 5% and 20%.
Keywords
high strength bolt; hydrogen embrittlement; concentrated hydrogen; intergranular fracture;
Citations & Related Records

Times Cited By SCOPUS : 4
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