Investigating the influence mechanism of hydrogen partial pressure on fracture toughness and fatigue life by in-situ hydrogen permeation |
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| Authors: | Shuai Zhang Juan Li Teng An Shuqi Zheng Ke Yang Liang Lv Chuang Xie Liqiang Chen Lin Zhang |
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| Affiliation: | 1. College of New Energy and Materials, China University of Petroleum, Beijing, 102249, People''s Republic of China;2. Beijing Key Laboratory of Advanced High Temperature Materials, Central Iron and Steel Research Institute, Beijing, 100081, People''s Republic of China;3. Institute of Material Forming and Control Engineering, Zhejiang University of Technology, Hangzhou, 310014, People''s Republic of China |
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| Abstract: | In this work, we investigate the influence mechanism of hydrogen partial pressure on fracture toughness and fatigue life of a high strength pipeline steel. Both fracture toughness test and fatigue life test are carried out under different hydrogen partial pressure. The experimental results show that with the increasing of hydrogen partial pressure, fracture toughness and fatigue life decrease and the decrease trends gradually flatten out. Hydrogen has a larger effect on fatigue life than fracture toughness. Only 3% hydrogen gas can cause a 67.7% decrease of fatigue life. The in-situ hydrogen permeation test is performed respectively in 2 MPa, 5 MPa and 8 MPa hydrogen partial pressure. With the increasing of hydrogen partial pressure, the increase trend of hydrogen permeation current gradually tends to be gentle, which indicates that the hydrogen atoms entering into the material gradually become saturated. This result can be used to clarify the influence mechanism of hydrogen partial pressure on fracture toughness and fatigue life. |
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| Keywords: | Fracture toughness Fatigue life In-situ hydrogen permeation Steel |
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