| About this Abstract |
| Meeting |
MS&T23: Materials Science & Technology
|
| Symposium
|
Steels for Sustainable Development II
|
| Presentation Title |
Effect of Strength on Fracture Toughness of Line Pipe Steel Under High Pressure Hydrogen Environment |
| Author(s) |
Hikaru Imayama, Daichi Izumi, Junji Shimamura, Yoshihiro Nishihara, Hiroshi Okano |
| On-Site Speaker (Planned) |
Hikaru Imayama |
| Abstract Scope |
The use of hydrogen and its energy is one of a number of potential means when looking ahead to achieving carbon neutrality. Furthermore, the selection of steel materials suitable for transporting the hydrogen is an important issue for the realization of hydrogen society. This presentation investigated the fundamental material behavior and mechanical properties of line pipe steels under high-pressure hydrogen environments. Using bainitic steels with different strengths produced by actual mill rolling as test materials, fracture toughness tests were conducted in hydrogen at 21 MPa by the unloading compliance method with reference to ASTM E 1820. As a result, the fracture toughness properties of Grade X80 steels were inferior to those of Grade X65. In addition, HAZ (heat affected zone) was inferior to the base material in Grade X80. The effect of strength on hydrogen embrittlement was discussed based on the change of fracture morphology after the test and each microstructure. |