Hydrogen-assisted crack propagation in α-iron during elasto-plastic fracture toughness tests

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING

卷:756

Article

Birenis, Domas¹  Ogawa, Yuhei^2,3  Matsunaga, Hisao^4,5,6  Takakuwa, Osamu^4,5,7  Yamabe, Junichiro^7,8  Prytz, Oystein¹  Thogersen, Annett⁹ 

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

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

[3] Japan Soc Promot Sci, Nishi Ku, 744 Motooka, Fukuoka, Fukuoka 8190395, Japan

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

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

[6] Kyushu Univ, I2CNER, Nishi Ku, 744 Motooka, Fukuoka, Fukuoka 8190395, Japan

[7] Kyushu Univ, AIST, Hydrogen Mat Lab HydroMate, Nishi Ku, 744 Motooka, Fukuoka, Fukuoka 8190395, Japan

[8] Fukuoka Univ, Dept Mech Engn, Jonan Ku, 8-19-1 Nanakuma, Fukuoka, Fukuoka 8140180, Japan

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

关键词: Fracture toughness;    Hydrogen embrittlement;    Dislocation structures;    Electron back-scattered diffraction (EBSD);    Transmission electron microscopy (TEM);   

DOI  :  10.1016/j.msea.2019.04.084

来源: Elsevier

【 摘 要 】

Elasto-plastic fracture toughness tests of a commercially pure iron were performed in air and in hydrogen gas at two different pressures. Some unique characteristics of hydrogen-enhanced cracking were exhibited at both the macroscopic and microscopic length scales, based on the observation of fracture surface, fracture plane, plasticity distribution and dislocation structure. The possible mechanisms responsible for the hydrogen-induced degradation of fracture toughness are discussed.

【 授权许可】

Free