Multi-scale observation of hydrogen-induced, localized plastic deformation in fatigue-crack propagation in a pure iron

SCRIPTA MATERIALIA

卷:140

Article

Ogawa, Yuhei^1,2  Birenis, Domas³  Matsunaga, Hisao^4,5,6  Thogersen, Annett⁷  Prytz, Oystein³  Takakuwa, Osamu⁵  Yamabe, Junichiro^5,6,8,9 

[1] Kyushu Univ, Grad Sch Engn, Nishi Ku, 744 Motooka, Fukuoka 8190395, Japan

[2] Res Fellow Japan Soc Promot Sci, Nishi Ku, 744 Motooka, Fukuoka 8190395, Japan

[3] Univ Oslo, Ctr Mat Sci & Nanotechnol, Dept Phys, POB 1048, NO-0316 Oslo, Norway

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

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

[6] Kyushu Univ, Int Inst Carbon Neutral Energy Res 12CNER, Nishi Ku, 744 Motooka, Fukuoka 8190395, Japan

[7] SINTEF, Mat & Chem, POB 124, NO-0314 Oslo, Norway

[8] Kyushu Univ, Int Res Ctr Hydrogen Energy, Nishi Ku, 744 Motooka, Fukuoka 8190395, Japan

[9] Kyushu Univ, AIST, Hydrogen Mat Lab HydroMate, 744 Motooka, Fukuoka 8190395, Japan

关键词: Fatigue;    Hydrogen embrittlement;    Dislocations;    Scanning electron microscopy (SEM);    Transmission electron microscopy (TEM);   

DOI  :  10.1016/j.scriptamat.2017.06.037

来源: Elsevier

【 摘 要 】

In order to study the influence of hydrogen on plastic deformation behavior in the vicinity of the fatigue crack-tip in a pure iron, a multi-scale observation technique was employed, comprising electron channeling contrast imaging (ECU), electron back-scattered diffraction (EBSD) and transmission electron microscopy (TEM). The analyses successfully demonstrated that hydrogen greatly reduces the dislocation structure evolution around the fracture path and localizes the plastic flow in the crack-tip region. Such clear evidence can reinforce the existing model in which this type of localized plasticity contributes to crack-growth acceleration in metals in hydrogen atmosphere, which has not yet been experimentally elucidated. (C) 2017 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

【 授权许可】

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