炭素鋼SM490B, 低合金鋼SCM435, ステンレス鋼SUS304の水素誘起き裂進展下限界値<i>K</i><sub>I,H</sub>に及ぼす水素ガス圧力の影響

Translated title of the contribution: Effect of hydrogen-gas pressure on threshold of hydrogen-induced crack growth for carbon steel JIS-SM490B, low-alloy steel JIS-SCM435 and stainless steel JIS-SUS304

松岡 三郎, 吉田 聡子, 飯島 高志, 濱田 繁, 松永 久生, 山辺 純一郎

Research output: Contribution to journalArticle

Abstract

<p>In order to clarify the effect of hydrogen-gas pressure on threshold of hydrogen-induced crack growth (<i>K</i><sub>I,H</sub>), elasto-plastic fracture toughness tests were performed on JIS-SM490B carbon steel, JIS-SCM435 low-alloy steel and JIS-SUS304 stainless steel. For JIS-SM490B and JIS-SUS304, the values of <i>K</i><sub>I,H</sub> at displacement rates of 2×10<sup>–5</sup> and 2×10<sup>–4</sup> mm/s were almost the same in hydrogen at pressures of <i>p</i><sub>H2</sub>= 20, 45 and 115 MPa (<i>K</i><sub>I,H</sub> ≒ 80 MPa·m<sup>1/2</sup> for JIS-SM490B and 150 MPa·m<sup>1/2</sup> for JIS-SUS304). In contrast, for JIS-SCM435, the values of <i>K</i><sub>I,H</sub> at displacement rates of 2×10<sup>–5</sup> and 2×10<sup>–4</sup> mm/s were the same in hydrogen gas at pressures of <i>p</i><sub>H2</sub> = 20, 45 and 80 MPa (<i>K</i><sub>I,H</sub> ≒ 100 MPa·m<sup>1/2</sup>); however, those of <i>K</i><sub>I,H</sub> were degraded in 115-MPa hydrogen gas (<i>K</i><sub>I,H</sub> ≒ 50 MPa·m<sup>1/2</sup>). Based on the HISCG (Hydrogen Induced Successive Crack Growth) model, an effect of <i>p</i><sub>H2</sub> on <i>K</i><sub>I,H</sub> and an existence of <i>K</i><sub>I,H</sub> were also discussed for JIS-SM490B, JIS-SCM435 and JIS-SUS304.</p>
Translated title of the contributionEffect of hydrogen-gas pressure on threshold of hydrogen-induced crack growth for carbon steel JIS-SM490B, low-alloy steel JIS-SCM435 and stainless steel JIS-SUS304
Original languageJapanese
Pages (from-to)18-00415-18-00415
Journal日本機械学会論文集
Volume85
Issue number872
DOIs
Publication statusPublished - 2019

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