3508 ガス配管用炭素鋼SGPの水素侵入特性と強度特性(S20-2 水素チャージ材の強度特性,S20 材料強度特性に及ぼす水素の影響)

概要

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The effects of hydrogen on Charpy impact properties of JIS-SGP carbon steel pipe for hydrogen pipelines were investigated. The brittle-ductile transition temperature was not changed by hydrogen charge. The Charpy impact values above the brittle-ductile transition temperature were decreased 20〜40J/cm^2 by the effect of hydrogen. The brittle fracture area of hydrogen-charged specimens was smaller than that of uncharged specimens. The elongated dimple area near the notch of hydrogen-charged specimens was larger than that of uncharged specimens. It is presumed that, the basic mechanism of so-called hydrogen embrittlement was produced by the enhancement of localized plasticity rather than lattice decohesion.
社団法人日本機械学会の論文
2006-09-15