Abstract
The influence of hydrogen embrittlement on the fatigue behaviors of AISI 304 stainless steel is investigated. The fatigue endurance limits of the untreated and hydrogen-embrittled materials were almost the same at 400 MPa, and hydrogen embrittlement had little influence even though the sample contained about 8.1 times more hydrogen. Thus, the sensitivity of hydrogen gas in this material is very low. A surface crack initiation, growth, coalescence, and micro ridge model is proposed in this study. Slip line formation ⇒ microcrack formation ⇒ increases in the crack width, and blunting of the crack tip as it grows ⇒ formation of many slip lines because of deformation in the shear direction ⇒ growth of the crack in the shear direction, forming micro ridges, coalescence with adjacent cracks ⇒ continuous initiation, growth, coalescence, and ridge formation of surface cracks and specimen breakage.
Highlights
Hydrogen has emerged as a new energy source because of the environmental pollution and depletion caused by oil
Slip line formation ⇒ microcrack formation ⇒ increases in the crack width, and blunting of the crack tip as it grows ⇒ formation of many slip lines because of deformation in the shear direction ⇒ growth of the crack in the shear direction, forming micro ridges, coalescence with adjacent cracks ⇒ continuous initiation, growth, coalescence, and ridge formation of surface cracks and specimen breakage
The rapid decrease in the elongation ratio indicates that the influence of hydrogen gas is greater than the 39% reduction observed for the stainless steel 316 L material in the previous study [3]
Summary
Hydrogen has emerged as a new energy source because of the environmental pollution and depletion caused by oil. Knowledge [1] [2] [3] and data for measurement and related technologies related for metal penetration and permeation for the safe supply and storage of hydrogen are urgently required [4] [5] [6] [7] [8]. In this way, interest in the safe use of hydrogen energy has increased domestically and abroad, and the role of science and technology is emphasized to protect public safety, by quickly minimizing the spread of hydrogen gas and the damage caused by safety accidents. The expansion of hydrogen energy is inevitable to solve the energy problem in Korea, and it is essential to continuously develop technologies and accumulate experience in preparation for safe hydrogen-related infrastructure to be increased in the future
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