Session: MF-02-02 Materials for Hydrogen Service-Effect of Gas Impurities

Paper Number: 123331

123331 - Fatigue Crack Growth Properties of Pipeline Steel X60 in Hydrogen Gas With Oxygen Impurity at Various Temperatures 

Hydrogen gas pipelines are expected to serve as a large-scale and cost-efficient transportation to promote the utilization of hydrogen energy. Ensuring their safe operation requires a thorough understanding of the various strength characteristics that degrade in the presence of hydrogen gas and the incorporation of this knowledge into the strength design. Among these characteristics, understanding fatigue crack growth is crucial for accurately predicting the crack growth life. It has been reported that various factors can influence the degree of crack acceleration in hydrogen gas, such as gas pressure, temperature, and gas impurities. However, many aspects of the acceleration characteristics under changing conditions remain unknown. In this study, we conducted fatigue crack growth tests using compact tension specimens of the pipeline steel, X60, to investigate the effects of temperature and oxygen impurity on hydrogen-induced crack acceleration. It is worth noting that significant degradation of fatigue crack growth resistance did not appear in hydrogen gas even at low temperatures down to −30°C, as compared to room temperature. Additionally, this study confirmed the inhibitory effect of oxygen impurity on mitigating crack acceleration. In our presentation, we will demonstrate some interesting findings related to the crack growth properties and then discuss the roles and mechanisms of each influencing factor in determining the acceleration characteristics.

Presenting Author: Hisao Matsunaga Kyushu University

Presenting Author Biography: • Director of Research Center for Hydrogen Industrial Use and Storage (HYDROGENIUS), 2023-present.
• Professor, Department of Mechanical Engineering, Kyushu University, 2017-present.
• Associate Professor, Department of Mechanical Engineering, Kyushu University, 2012-2017.
• Visiting Scholar, George W. Woodruff School of Mechanical Engineering, Georgia Institute of Technology, 2010-2011.
• Associate Professor, Department of Mechanical Engineering, Fukuoka University, 2005-2012.
• Lecturer, Department of Mechanical Engineering, Kyushu University, 2002-2005.
• JSPS Research Fellowship for Young Scientists, 1999-2002.

Authors:

Naoyuki Osada Graduate School of Kyushu University
Yukinori Yanase Material & Corrosion Group, Technical Research Center, INPEX
Toshiyuki Sunaba Material & Corrosion Group, Technical Research Center, INPEX
Masanobu Kubota International Institute for Carbon-Neutral Energy Research, Kyushu University (WPI-I2CNER)
Hisao Matsunaga Kyushu University