Hydrogen embrittlement behavior of Inconel 718 alloy at room temperature |
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| Authors: | Xinfeng Li Jin Zhang Eiji Akiyama Qinqin Fu Qizhen Li |
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| Affiliation: | 1. School of Mechanical and Materials Engineering, Washington State University, Pullman, 99164, USA;2. Department of Geosciences, Stony Brook University, New York, 11794, USA;3. Institute for Materials Research, Materials Design Division, Tohoku University, Sendai, 9808577, Japan;4. State Key Laboratory for Mechanical Behaviors of Materials, School of Materials Science and Engineering, Xi’an Jiaotong University, Xi’an, 710049, China |
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| Abstract: | Hydrogen embrittlement of Inconel 718 alloy was investigated. Multi-scale observation technique were employed, comprising slow strain rate tensile tests, scanning electron microscopy and transmission electron microscopy analysis. The results demonstrate that hydrogen charging deteriorates mechanical properties of the alloy. Inconel 718 alloy shows partial Portevin-Le Chatelier(PLC) effect at room temperature when hydrogen charging current density is 220 mA cm~(-2) and 590 mA cm~(-2). Moreover, plastic deformation features with dislocation cells are detected in hydrogen-induced brittle zone. Thus, it is concluded that dragging effect of hydrogen atoms on dislocations contributes to PLC effect. |
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| Keywords: | Embrittlement Hydrogen in metals Inconel 718 alloy Portevin-Le Chatelier effect |
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