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Hydrogen effects on tensile property of pure iron with deformed surface

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Title: Hydrogen effects on tensile property of pure iron with deformed surface
Authors: Wang, Shuai Browse this author
Ohnuki, Somei Browse this author →KAKEN DB
Hashimoto, Naoyuki Browse this author
Chiba, Keisuke Browse this author
Keywords: Hydrogen
Dislocation structure
Issue Date: 10-Jan-2013
Publisher: Elsevier B.V.
Journal Title: Materials Science and Engineering: A
Volume: 560
Start Page: 332
End Page: 338
Publisher DOI: 10.1016/j.msea.2012.09.075
Abstract: To study the interaction of hydrogen and surface structure of iron, two types of tensile test are carried out under hydrogen gas environment and cathodic hydrogen charging condition. According to the tensile tests, hydrogen induces reduction of flow stress (softening) for the specimens without deformed surface, but increase of flow stress (hardening) for the one with deformed surface. The results of jump tests signify that hydrogen enhances the dislocation mobility by reducing the thermal activation volume for overcoming barriers, and because of this, in the samples with smooth surface, homogeneously distributed hydrogen leads to the softening effect. On the other hand, the deformed layer just under the surface has larger solubility of H due to trap sites provided by dislocation cell structures. As a result of hydrogen shielding effect, the strong interaction between dislocations in surface layer and multiplication of new defects causes the hardening effect.
Type: article (author version)
Appears in Collections:工学院・工学研究院 (Graduate School of Engineering / Faculty of Engineering) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 王 帥(Shuai Wang)

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