Fracture Toughness Characteristics of High-Manganese Austenitic Steel Plate for Application in a Liquefied Natural Gas Carrier
High-manganese austenitic steel was developed to improve the fracture toughness and safety of steel under cryogenic temperatures, and its austenite structure was formed by increasing the Mn content. The developed high-manganese austenitic steel was alloyed with austenite-stabilizing elements (e.g.,...
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MDPI AG
2021-12-01
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| Series: | Metals |
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| Online Access: | https://www.mdpi.com/2075-4701/11/12/2047 |
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| author | Gyubaek An Jeongung Park Hongkyu Park Ilwook Han |
| author_facet | Gyubaek An Jeongung Park Hongkyu Park Ilwook Han |
| author_sort | Gyubaek An |
| collection | DOAJ |
| description | High-manganese austenitic steel was developed to improve the fracture toughness and safety of steel under cryogenic temperatures, and its austenite structure was formed by increasing the Mn content. The developed high-manganese austenitic steel was alloyed with austenite-stabilizing elements (e.g., C, Mn, and Ni) to increase cryogenic toughness. It was demonstrated that 30 mm thickness high-manganese austenitic steel, as well as joints welded with this steel, had a sufficiently higher fracture toughness than the required toughness values evaluated under the postulated stress conditions. High-manganese austenitic steel can be applied to large offshore and onshore LNG storage and fuel tanks located in areas experiencing cryogenic conditions. Generally, fracture toughness decreases at lower temperatures; therefore, cryogenic steel requires high fracture toughness to prevent unstable fractures. Brittle fracture initiation and arrest tests were performed using 30 mm thickness high-manganese austenitic steel and SAW joints. The ductile fracture resistance of the weld joints (weld metal, fusion line, fusion line + 2 mm) was investigated using the R-curve because a crack in the weld joint tends to deviate into the weld metal in the case of undermatched joints. The developed high-manganese austenitic steel showed little possibility of brittle fracture and a remarkably unstable ductile fracture toughness. |
| first_indexed | 2024-03-10T03:33:53Z |
| format | Article |
| id | doaj.art-1016420c5691444f9adbff0ad8bfd0a3 |
| institution | Directory Open Access Journal |
| issn | 2075-4701 |
| language | English |
| last_indexed | 2024-03-10T03:33:53Z |
| publishDate | 2021-12-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Metals |
| spelling | doaj.art-1016420c5691444f9adbff0ad8bfd0a32023-11-23T09:34:44ZengMDPI AGMetals2075-47012021-12-011112204710.3390/met11122047Fracture Toughness Characteristics of High-Manganese Austenitic Steel Plate for Application in a Liquefied Natural Gas CarrierGyubaek An0Jeongung Park1Hongkyu Park2Ilwook Han3Department of Naval Architecture and Ocean Engineering, Chosun University, Gwangju 61452, KoreaDepartment of Civil Engineering, Chosun University, Gwangju 61452, KoreaDepartment of Naval Architecture and Ocean Engineering, Chosun University, Gwangju 61452, KoreaTechnical Research Laboratory, POSCO, Pohang 37859, KoreaHigh-manganese austenitic steel was developed to improve the fracture toughness and safety of steel under cryogenic temperatures, and its austenite structure was formed by increasing the Mn content. The developed high-manganese austenitic steel was alloyed with austenite-stabilizing elements (e.g., C, Mn, and Ni) to increase cryogenic toughness. It was demonstrated that 30 mm thickness high-manganese austenitic steel, as well as joints welded with this steel, had a sufficiently higher fracture toughness than the required toughness values evaluated under the postulated stress conditions. High-manganese austenitic steel can be applied to large offshore and onshore LNG storage and fuel tanks located in areas experiencing cryogenic conditions. Generally, fracture toughness decreases at lower temperatures; therefore, cryogenic steel requires high fracture toughness to prevent unstable fractures. Brittle fracture initiation and arrest tests were performed using 30 mm thickness high-manganese austenitic steel and SAW joints. The ductile fracture resistance of the weld joints (weld metal, fusion line, fusion line + 2 mm) was investigated using the R-curve because a crack in the weld joint tends to deviate into the weld metal in the case of undermatched joints. The developed high-manganese austenitic steel showed little possibility of brittle fracture and a remarkably unstable ductile fracture toughness.https://www.mdpi.com/2075-4701/11/12/2047brittle fractureCTODcryogenic steelbrittle crack initiation/propagation |
| spellingShingle | Gyubaek An Jeongung Park Hongkyu Park Ilwook Han Fracture Toughness Characteristics of High-Manganese Austenitic Steel Plate for Application in a Liquefied Natural Gas Carrier Metals brittle fracture CTOD cryogenic steel brittle crack initiation/propagation |
| title | Fracture Toughness Characteristics of High-Manganese Austenitic Steel Plate for Application in a Liquefied Natural Gas Carrier |
| title_full | Fracture Toughness Characteristics of High-Manganese Austenitic Steel Plate for Application in a Liquefied Natural Gas Carrier |
| title_fullStr | Fracture Toughness Characteristics of High-Manganese Austenitic Steel Plate for Application in a Liquefied Natural Gas Carrier |
| title_full_unstemmed | Fracture Toughness Characteristics of High-Manganese Austenitic Steel Plate for Application in a Liquefied Natural Gas Carrier |
| title_short | Fracture Toughness Characteristics of High-Manganese Austenitic Steel Plate for Application in a Liquefied Natural Gas Carrier |
| title_sort | fracture toughness characteristics of high manganese austenitic steel plate for application in a liquefied natural gas carrier |
| topic | brittle fracture CTOD cryogenic steel brittle crack initiation/propagation |
| url | https://www.mdpi.com/2075-4701/11/12/2047 |
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