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成果報告書詳細
管理番号20190000000653
タイトル*平成30年度中間年報 超高圧水素インフラ本格普及技術研究開発事業/国内規制適正化に関わる技術開発/連続陰極水素チャージ法による水素インフラ用鋼材の水素特性判断の簡易評価手法の開発
公開日2019/6/27
報告書年度2018 - 2018
委託先名JFEスチール株式会社
プロジェクト番号P18011
部署名次世代電池・水素部
和文要約
英文要約Title: Development of simplified evaluation method of resistance of steels for
hydrogen infrastructure to hydrogen embrittlement using concurrent
cathodic hydrogen charging

Abstract: It is well recognized that hydrogen causes degradation of mechanical
properties of metals such as steel; this phenomenon is commonly termed
hydrogen embrittlement. The objective of this study is to establish an
alternative method to evaluate resistance of low-alloy steels to
hydrogen embrittlement in H2 gas using generalized concurrent cathodic
hydrogen charging. First, hydrogen uptake and tensile behavior were
investigated in 105 MPa H2 gas using SNCM439 tempered lath martensitic
steel. Hydrogen uptake occurred after yield point and caused a decrease
in reduction in area from 72% in air to 29% in H2 gas. The
hydrogen-induced fracture surface showed a mixture of “quasi-cleavage”
and ductile microvoid coalescence features. To reproduce these
characteristics in H2 gas by concurrent cathodic hydrogen
charging, hydrogen uptake and tensile behavior were examined using 3%
NaCl+3g/L NH4SCN and 1N NaOH+3g/L NH4SCN solutions. Resistance to
hydrogen embrittlement in the NaCl solution was milder than H2 gas,
while that in the NaOH solution was severer when compared at a condition
of the same hydrogen content as 105 MPa H2 gas; hydrogen charging was
started at the same time with the slow strain rate tensile tests. The
former is related to a drastic decrease in pH and the latter is a result
of higher hydrogen content. Hence, when hydrogen charging started at
yield point in the NaOH solution to reproduce hydrogen uptake in H2 gas,
tension behavior and fracture surface showed almost identical to H2 gas.

Contract number: 18100909-0
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