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Effect of hydrogen on dislocation structures around a mixed-mode fatigue crack tip in a single-crystalline iron–silicon alloy
Authors:Yoshimasa Takahashi  Junji Sakamoto  Masaki Tanaka  Kenji Higashida  Hiroshi Noguchi
Affiliation:1. National Institute of Advanced Industrial Science and Technology (AIST), 744 Motooka, Nishi-ku, Fukuoka 819-0395, Japan;2. Department of Mechanical Engineering, Kyushu University, 744 Motooka, Nishi-ku, Fukuoka 819-0395, Japan;3. Department of Materials Science and Engineering, Kyushu University, 744 Motooka, Nishi-ku, Fukuoka 819-0395, Japan;1. Materials Center Leoben Forschung GmbH, Roseggerstraße 12, 8700 Leoben, Austria;2. Department of Materials, Textiles and Chemical Engineering, Ghent University (UGent), Technologiepark 903, B-9052 Ghent, Belgium;1. School of Mechanical Engineering and Mechanics, Ningbo University, Ningbo 315211, PR China;2. School of Aerospace Engineering, Tsinghua University, Beijing 100084, China;1. Beijing Jiaotong University, Material Science and Engineering Research Center, Beijing 100044, People''s Republic of China;2. Laboratory for Excellence in Advanced Steel Research, Department of Metallurgical, Materials and Biomedical Engineering, University of Texas at El Paso, TX 79968-0520, USA;3. Tsinghua University, Key Laboratory of Advanced Material, School of Material Science & Engineering, Beijing 100084, People''s Republic of China;1. Department of Mechanical Engineering, Faculty of Engineering, Kyushu University, 744 Moto-oka, Nishi-ku, Fukuoka 819-0395, Japan;2. International Institute for Carbon Neutral Energy Research (WPI-I2CNER), Kyushu University, 744 Moto-oka, Nishi-ku, Fukuoka 819-0395, Japan;3. Department of Mechanical Engineering, Graduate School of Engineering, Kyushu University, 744 Moto-oka, Nishi-ku, Fukuoka 819-0395, Japan;1. School of Mechanical, Materials and Mechatronic Engineering, University of Wollongong, New South Wales, 2522, Australia;2. Materials Science and Technology Division, Los Alamos National Laboratory, New Mexico, 87545, United States;3. Electron Microscopy Centre, University of Wollongong, New South Wales, 2500, Australia
Abstract:The effect of hydrogen on dislocation structures around a mixed-mode fatigue crack tip in a single-crystalline iron–silicon alloy was investigated by cross-sectional electron backscatter diffraction and high-voltage electron microscopy. In contrast to the previously reported results in an inert environment, no dislocation cells were formed around the crack tip in a hydrogen environment. The microscopic features around the crack tip suggest that hydrogen promotes a mode I-type crack growth mechanism, which reasonably explains the observed macroscopic crack growth property.
Keywords:
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