115 MPa水素ガス中におけるSCM435の水素誘起き裂進展下限界<i>K</i><sub>I,H</sub>を求める試験方法

Translated title of the contribution: Test Methods for Threshold of Hydrogen-Induced Crack Growth, <i>K</i><sub>I,H</sub>, of SCM435 in 115 MPa Hydrogen Gasr

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

Research output: Contribution to journalArticle

Abstract

<p>To establish the test methods for obtaining threshold of hydrogen-induced crack growth, <i>K</i><sub>I,H</sub>, constant load, constant displacement and <i>J</i><sub>IC</sub> tests, and <i>J</i><sub>IC</sub> test without unloading were conducted on SCM435 in 115 MPa hydrogen gas. Constant load and constant displacement tests are standardized by ASME KD-10. Especially, the test duration of ferritic steels such as SCM435 is at least 1000 hr. <i>J</i><sub>IC</sub> test is standardized by ASTM E1820. <i>J</i><sub>IC</sub> test without unloading is monotonically-rising-displacement test where unloading processes are eliminated in <i>J</i><sub>IC</sub> test. All four tests were done under the small scale yielding in 115 MPa hydrogen gas. However, <i>J</i><sub>IC</sub> test was not realized, because CT specimen failured before the first unloading process. <i>K</i><sub>I,H</sub> of other three tests was almost the same. From viewpoints of test duration and number of specimens, <i>J</i><sub>IC</sub> test without loading was the best test method for <i>K</i><sub>I,H</sub> in 115 MPa hydrogen gas. On the other hand, <i>J</i><sub>IC</sub> test was the only test method for fracture toughness, KIC, in air , because KIC was obtained under the large scale yielding.</p>
Translated title of the contributionTest Methods for Threshold of Hydrogen-Induced Crack Growth, <i>K</i><sub>I,H</sub>, of SCM435 in 115 MPa Hydrogen Gasr
Original languageJapanese
Pages (from-to)OS16-10
JournalM&M材料力学カンファレンス
Volume2016
Issue number0
DOIs
Publication statusPublished - 2016

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