M&M材料力学カンファレンス
Online ISSN : 2424-2845
セッションID: OS1803
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低炭素鋼SM490Bと低合金鋼SCM435の疲労き裂進展に及ぼす水素ガス圧力と試験温度の影響
*吉川 倫夫髙桑 脩岡﨑 三郎山辺 純一郎松永 久生松岡 三郎
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In order to investigate the effects of hydrogen gas pressure and temperature on fatigue crack growth characterizations of low carbon steel JIS-SM490B and low alloy steel JIS-SCM435, fatigue crack growth tests using a CT specimen were conducted in pressurized gaseous hydrogen in various temperature. In low-pressure hydrogen gas, the fatigue crack growth rate was decreased with increasing of temperature. On the other hand, in high-pressure hydrogen gas, the fatigue crack growth rate was not depending on temperature. The mechanism of fatigue crack growth under hydrogen environment with various temperature and pressure was discussed based on the theory of dislocation trapping of hydrogen.

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