Effect of Hydrogen on Tensile Properties and Fracture Behavior of Two High-Strength American Petroleum Institute Linepipe Steels
This study explored the influence of hydrogen on the tensile properties and fracture behavior of high-strength API X70 and X80 linepipe steels with bainitic microstructures under varying hydrogen charging conditions. The X70 steel exhibited a ferritic microstructure with some pearlite, while the X80...
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MDPI AG
2024-12-01
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| author | Dong-Kyu Oh Min-Seop Jeong Seung-Hyeok Shin Byoungchul Hwang |
| author_facet | Dong-Kyu Oh Min-Seop Jeong Seung-Hyeok Shin Byoungchul Hwang |
| author_sort | Dong-Kyu Oh |
| collection | DOAJ |
| description | This study explored the influence of hydrogen on the tensile properties and fracture behavior of high-strength API X70 and X80 linepipe steels with bainitic microstructures under varying hydrogen charging conditions. The X70 steel exhibited a ferritic microstructure with some pearlite, while the X80 steel showed a bainitic microstructure and fine pearlite due to the addition of molybdenum. Slow strain rate tests (SSRTs) were conducted using both electrochemical ex situ and in situ hydrogen charging methods subjected to different current densities. The SSRT results showed that in situ hydrogen-charged SSRT, performed at current densities above 1 A/m<sup>2</sup>, led to more pronounced hydrogen embrittlement compared to ex situ hydrogen-charged SSRT. This occurred because hydrogen was continuously supplied during deformation, exceeding the critical concentration even in the center regions, leading to quasi-cleavage fractures marked by localized cleavage and tearing ridges. Thermal desorption analysis (TDA) confirmed that a greater amount of hydrogen was trapped at dislocations during in situ hydrogen-charged SSRT, intensifying hydrogen embrittlement, even with a shorter hydrogen charging duration. These findings highlight the importance of selecting appropriate hydrogen charging methods and understanding the hydrogen embrittlement behavior of linepipe steels. |
| format | Article |
| id | doaj-art-050b03dc7ca84a3498347245b06f12e2 |
| institution | DOAJ |
| issn | 2075-4701 |
| language | English |
| publishDate | 2024-12-01 |
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| series | Metals |
| spelling | doaj-art-050b03dc7ca84a3498347245b06f12e22025-08-20T02:57:16ZengMDPI AGMetals2075-47012024-12-011412139710.3390/met14121397Effect of Hydrogen on Tensile Properties and Fracture Behavior of Two High-Strength American Petroleum Institute Linepipe SteelsDong-Kyu Oh0Min-Seop Jeong1Seung-Hyeok Shin2Byoungchul Hwang3Department of Materials Science and Engineering, Seoul National University of Science and Technology (SEOULTECH), 232 Gongneung-ro, Nowon-gu, Seoul 01811, Republic of KoreaDepartment of Materials Science and Engineering, Seoul National University of Science and Technology (SEOULTECH), 232 Gongneung-ro, Nowon-gu, Seoul 01811, Republic of KoreaDepartment of Materials Science and Engineering, Seoul National University of Science and Technology (SEOULTECH), 232 Gongneung-ro, Nowon-gu, Seoul 01811, Republic of KoreaDepartment of Materials Science and Engineering, Seoul National University of Science and Technology (SEOULTECH), 232 Gongneung-ro, Nowon-gu, Seoul 01811, Republic of KoreaThis study explored the influence of hydrogen on the tensile properties and fracture behavior of high-strength API X70 and X80 linepipe steels with bainitic microstructures under varying hydrogen charging conditions. The X70 steel exhibited a ferritic microstructure with some pearlite, while the X80 steel showed a bainitic microstructure and fine pearlite due to the addition of molybdenum. Slow strain rate tests (SSRTs) were conducted using both electrochemical ex situ and in situ hydrogen charging methods subjected to different current densities. The SSRT results showed that in situ hydrogen-charged SSRT, performed at current densities above 1 A/m<sup>2</sup>, led to more pronounced hydrogen embrittlement compared to ex situ hydrogen-charged SSRT. This occurred because hydrogen was continuously supplied during deformation, exceeding the critical concentration even in the center regions, leading to quasi-cleavage fractures marked by localized cleavage and tearing ridges. Thermal desorption analysis (TDA) confirmed that a greater amount of hydrogen was trapped at dislocations during in situ hydrogen-charged SSRT, intensifying hydrogen embrittlement, even with a shorter hydrogen charging duration. These findings highlight the importance of selecting appropriate hydrogen charging methods and understanding the hydrogen embrittlement behavior of linepipe steels.https://www.mdpi.com/2075-4701/14/12/1397linepipe steelelectrochemicalhydrogen embrittlementmicrostructurethermal desorption analysis (TDA) |
| spellingShingle | Dong-Kyu Oh Min-Seop Jeong Seung-Hyeok Shin Byoungchul Hwang Effect of Hydrogen on Tensile Properties and Fracture Behavior of Two High-Strength American Petroleum Institute Linepipe Steels Metals linepipe steel electrochemical hydrogen embrittlement microstructure thermal desorption analysis (TDA) |
| title | Effect of Hydrogen on Tensile Properties and Fracture Behavior of Two High-Strength American Petroleum Institute Linepipe Steels |
| title_full | Effect of Hydrogen on Tensile Properties and Fracture Behavior of Two High-Strength American Petroleum Institute Linepipe Steels |
| title_fullStr | Effect of Hydrogen on Tensile Properties and Fracture Behavior of Two High-Strength American Petroleum Institute Linepipe Steels |
| title_full_unstemmed | Effect of Hydrogen on Tensile Properties and Fracture Behavior of Two High-Strength American Petroleum Institute Linepipe Steels |
| title_short | Effect of Hydrogen on Tensile Properties and Fracture Behavior of Two High-Strength American Petroleum Institute Linepipe Steels |
| title_sort | effect of hydrogen on tensile properties and fracture behavior of two high strength american petroleum institute linepipe steels |
| topic | linepipe steel electrochemical hydrogen embrittlement microstructure thermal desorption analysis (TDA) |
| url | https://www.mdpi.com/2075-4701/14/12/1397 |
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