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Ibaraki University Academic Repository
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Bibliographic Record
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- Material Type
- 規格・テクニカルリポート類
- Author/Editor
- 鴻巣,, 眞二Konosu,, Shinji
- Author Heading
- Publication, Distribution, etc.
- Publication Date
- 2016-06-02
- Publication Date (W3CDTF)
- 2016
- Alternative Title
- Clarification of the effects of trace elements on hydrogen embritllement and establishment of technique to evaluate the structural integrity
- Target Audience
- 一般
- Note (General)
- 出版タイプ： VoRapplication/pdftext/plain研究報告書研究成果の概要（和文）：鉄基材料の水素脆化感受性に与える微量元素の影響に着目し、昇温水素離脱反応と走査電顕解析によって、約0.3％のV添加による旧オーステナイト粒内でのﾊﾞﾅｼﾞｭｳﾑ炭化物の微細析出が水素脆化感受性低減に有効であるが、PやSnなどの不純物元素低下は水素助長割れ発生抵抗に対してはほとんど影響がないことを明らかにした。装置の安全性評価のためには、割れの発生抵抗である破壊じん性KIH、伝播抵抗であるdJ/daおよび一定荷重下での進展速度da/dt 特性が必要とされる。本研究においては、新たに開発したオフセットポテンシャル法を用いて微量元素を調整した2.25Cr-1Mo鋼でそれらの特性を明らかにした。 研究成果の概要（英文）：By focusing attention on the effects of trace elements on hydrogen embrittlement sensitivity for iron-based materials, the thermal desorption analysis and electro probe microanalysis were conducted. A number of dispersed vanadium carbides caused by the addition of roughly 0.3 wt.% vanadium is effective in mitigating hydrogen embrittlement, while the reduction of impurity elements such as phosphorus and tin has little impact on threshold for hydrogen-induced fracture. For a structural integrity assessment, the mechanical characteristics such as threshold stress intensity factors at the onset of hydrogen-assisted crack growth, KIH, the tearing resistance, dJ/da and subcritical crack growth rates at constant loads, da/dt need to be known. In this study, the newly developed offset potential-drop method was employed to clarify these properties for 2.25Cr-1Mo steels with trace element controls.