Fatigue crack-growth retardation after overloading in gaseous hydrogen: Revisiting the effect of hydrogen on crack-tip plastic-zone development

被引：4

作者：

Ogawa, Yuhei ^{[1
,2
]}

Iwata, Keiichiro ^{[1
]}

Okazaki, Saburo ^{[2
,3
]}

Nakamura, Masami ^{[2
,3
]}

Matsubara, Kazuki ^{[4
]}

Takakuwa, Osamu ^{[1
,2
]}

Matsunaga, Hisao ^{[1
,2
,5
]}

机构：

[1] Kyushu Univ, Dept Mech Engn, Nishi Ku, 744 Motooka, Fukuoka 8190395, Japan

[2] Kyushu Univ, Res Ctr Hydrogen Ind Use & Storage HYDROGENIUS, Nishi Ku, 744 Motooka, Fukuoka 8190395, Japan

[3] Kobe Mat Testing Lab Co Ltd, 47-13 Niijima, Harima, Hyogo 6750155, Japan

[4] JFE Steel Corp, Kawasaki Ku, 1-1 Minamiwatarida Cho, Kawasaki, Kanagawa 2100855, Japan

[5] Kyushu Univ, Int Inst Carbon Neutral Energy Res I2CNER, Nishi Ku, 744 Motooka, Fukuoka 8190395, Japan

来源：

MATERIALS LETTERS | 2022年 / 308卷

关键词：

Fatigue crack retardation; Overload; Plastic-zone; Hydrogen-assisted cracking; PROPAGATION; EMBRITTLEMENT; DEFORMATION; FAILURE; CARBON; STEELS;

D O I：

10.1016/j.matlet.2021.131115

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The impact of hydrogen on crack-tip plastic-zone development was revisited via a novel approach, utilizing the measurement of fatigue crack-growth retardation in a medium-strength martensitic steel after a single overloading in laboratory air and in 90-MPa-hydrogen gas. The plastic zone can be characterized according to the crack-propagation length for reverting from the retardation caused by plasticity-induced crack-closure ascribed to overloading (overloading-affected, crack-growth distance). Hydrogen sharpened the shape of overloaded crack-tip and suppressed the extension of the severely-deformed zone in the crack proximity. Besides, it enhanced frequent crack-tip branching, giving rise to a slower crack growth rate than the in-air situation at the initial stage of retardation. However, no change in the overloading-affected, crack-growth distance was detected between the in-air and hydrogen-gas conditions. Ultimately, hydrogen barely altered the overall plastic-zone size.

引用

页数：4

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