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

Arashima Hironobu; Masada Satoru; Isobe ShigehitoHashimoto Naoyuki

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

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

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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.

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来源
《ISIJ International》 |2022年第7期|1540-1547|共8页
作者
Arashima Hironobu; Masada Satoru; Isobe ShigehitoHashimoto Naoyuki;
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作者单位

Japan Steel Works M&E Inc;

Hokkaido Univ;

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收录信息美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
原文格式 PDF
正文语种英语
中图分类黑色金属材料;
关键词
low-alloy steel; high-pressure hydrogen gas; hydrogen embrittlement; stress intensity factor; rising load test; crack initiation; INITIATION;

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

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