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Crack Propagation Behavior of SNCM439 Steels in High-pressure Hydrogen Gas

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Title: Crack Propagation Behavior of SNCM439 Steels in High-pressure Hydrogen Gas
Authors: Arashima, Hironobu Browse this author
Masada, Satoru Browse this author
Isobe, Shigehito Browse this author
Hashimoto, Naoyuki Browse this author
Keywords: low-alloy steel
high-pressure hydrogen gas
hydrogen embrittlement
stress intensity factor
rising load test
crack initiation
Issue Date: 15-Jul-2022
Publisher: 一般社団法人 日本鉄鋼協会
Journal Title: ISIJ international
Volume: 62
Issue: 7
Start Page: 1540
End Page: 1547
Publisher DOI: 10.2355/isijinternational.ISIJINT-2022-017
Abstract: To investigate the effect of high-pressure hydrogen gas on the fracture of high-strength low-alloy steels, rising load tests were conducted on JIS SNCM439 steel in high-pressure (20 MPa) hydrogen gas at room temperature (20-25 degrees C), and its hydrogen-induced crack initiation behavior was investigated. The load-crack opening displacement curve obtained for rising load tests in hydrogen began to deviate from that obtained in air at very low loads, indicating that the stress intensity factor at crack initiation was significantly smaller in hydrogen. Scanning electron microscopy observations of the fractured surfaces of the specimens unloaded during the middle of the rising load test confirmed that hydrogen-induced cracks had already occurred at a load lower than the deviation point. The stretch zone that appeared in the rising load test in air was not observed for the test in hydrogen, and the hydrogen-induced cracks were found to directly initiate from the tip of the fatigue pre-crack. The hydrogen-induced cracks were initiated at almost the same stress intensity factor value as that at which the stretch zone was observed in air, indicating that plastic slip and the resulting hydrogen ingress from the new surface were the causes of the hydrogen embrittlement. In addition, it was shown that the stress intensity factor for crack initiation in hydrogen increased and the effect of hydrogen decreased with the increase in loading rate, inferring that dislocation migration and hydrogen penetration into the steel are key factors for hydrogen embrittlement.
Type: article
Appears in Collections:工学院・工学研究院 (Graduate School of Engineering / Faculty of Engineering) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

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