Simultaneously enhancing strength and fracture toughness via tailoring the microstructure in X80 girth weld metal
Brittle fracture of girth weld metal is the main failure form of high strength steel oil and gas pipeline facilities, which is related to the deterioration of mechanical properties of weld metal at low temperature, especially the fracture toughness. In order to improve the strength and fracture toug...
| Auteurs principaux: | , , , , , , , |
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| Format: | Article |
| Langue: | English |
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Elsevier
2024-03-01
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| Collection: | Journal of Materials Research and Technology |
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| Accès en ligne: | http://www.sciencedirect.com/science/article/pii/S2238785424002837 |
| _version_ | 1827310750099570688 |
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| author | Ce Wang Chengning Li Lianshuang Dai Xiaocong Yang Jiawei Han Shaohua Cui Zhenwen Yang Xinjie Di |
| author_facet | Ce Wang Chengning Li Lianshuang Dai Xiaocong Yang Jiawei Han Shaohua Cui Zhenwen Yang Xinjie Di |
| author_sort | Ce Wang |
| collection | DOAJ |
| description | Brittle fracture of girth weld metal is the main failure form of high strength steel oil and gas pipeline facilities, which is related to the deterioration of mechanical properties of weld metal at low temperature, especially the fracture toughness. In order to improve the strength and fracture toughness, tempering and intercritical quenching-tempering treatment are used in X80 girth weld metal. The results demonstrate that the heat treatment processes not only decomposed M-A constituent, but also increased grain size, reduced dislocation density and increased precipitated phase content. In the intercritical quenching-tempering treatment, small size retained austenite was produced, which was rich in carbon and manganese elements. The tempering and intercritical quenching-tempering treatment process significantly improved the tensile properties and fracture toughness, so that the Rt0.5 increased from 598 MPa to 629 MPa and 648 MPa, and the value of crack tip opening displacement (CTOD) increased from 0.05 mm to 0.12 mm and 0.23 mm, respectively. (Nb,Ti)C precipitated during heat treatment could effectively improve the yield strength, and the increase of precipitation strengthening is much higher than the strength loss caused by grain size increase and dislocation density reduction. Transformation induced plasticity effect of stable retained austenite formed by intercritical quenching-tempering treatment could effectively inhibit crack propagation and improve fracture toughness. The combined effect of retained austenite and nano-precipitated (Nb,Ti)C significantly improves the strength and fracture toughness of the weld metal. Generally, the research results have important scientific value and engineering significance for explaining the strength and toughness mechanism of girth weld and practical pipeline engineering application. |
| first_indexed | 2024-03-08T00:24:15Z |
| format | Article |
| id | doaj.art-cf588cd8735449cb950228d92f4f3c48 |
| institution | Directory Open Access Journal |
| issn | 2238-7854 |
| language | English |
| last_indexed | 2024-04-24T20:06:02Z |
| publishDate | 2024-03-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Journal of Materials Research and Technology |
| spelling | doaj.art-cf588cd8735449cb950228d92f4f3c482024-03-24T06:57:53ZengElsevierJournal of Materials Research and Technology2238-78542024-03-012930963107Simultaneously enhancing strength and fracture toughness via tailoring the microstructure in X80 girth weld metalCe Wang0Chengning Li1Lianshuang Dai2Xiaocong Yang3Jiawei Han4Shaohua Cui5Zhenwen Yang6Xinjie Di7School of Materials Science and Engineering, Tianjin University, Tianjin, 300072, ChinaSchool of Materials Science and Engineering, Tianjin University, Tianjin, 300072, China; Tianjin Key Laboratory of Advanced Joining Technology, Tianjin, 300072, China; Corresponding author. School of Materials Science and Engineering, Tianjin University, Tianjin, 300072, China.China Oil & Gas Pipeline Network Corporation, Beijing, 100013, ChinaSchool of Materials Science and Engineering, Tianjin University, Tianjin, 300072, ChinaSchool of Materials Science and Engineering, Tianjin University, Tianjin, 300072, ChinaChina Oil & Gas Pipeline Network Corporation, Beijing, 100013, ChinaSchool of Materials Science and Engineering, Tianjin University, Tianjin, 300072, China; Tianjin Key Laboratory of Advanced Joining Technology, Tianjin, 300072, ChinaSchool of Materials Science and Engineering, Tianjin University, Tianjin, 300072, China; Tianjin Key Laboratory of Advanced Joining Technology, Tianjin, 300072, China; Corresponding authorSchool of Materials Science and Engineering, Tianjin University, Tianjin, 300072, China.Brittle fracture of girth weld metal is the main failure form of high strength steel oil and gas pipeline facilities, which is related to the deterioration of mechanical properties of weld metal at low temperature, especially the fracture toughness. In order to improve the strength and fracture toughness, tempering and intercritical quenching-tempering treatment are used in X80 girth weld metal. The results demonstrate that the heat treatment processes not only decomposed M-A constituent, but also increased grain size, reduced dislocation density and increased precipitated phase content. In the intercritical quenching-tempering treatment, small size retained austenite was produced, which was rich in carbon and manganese elements. The tempering and intercritical quenching-tempering treatment process significantly improved the tensile properties and fracture toughness, so that the Rt0.5 increased from 598 MPa to 629 MPa and 648 MPa, and the value of crack tip opening displacement (CTOD) increased from 0.05 mm to 0.12 mm and 0.23 mm, respectively. (Nb,Ti)C precipitated during heat treatment could effectively improve the yield strength, and the increase of precipitation strengthening is much higher than the strength loss caused by grain size increase and dislocation density reduction. Transformation induced plasticity effect of stable retained austenite formed by intercritical quenching-tempering treatment could effectively inhibit crack propagation and improve fracture toughness. The combined effect of retained austenite and nano-precipitated (Nb,Ti)C significantly improves the strength and fracture toughness of the weld metal. Generally, the research results have important scientific value and engineering significance for explaining the strength and toughness mechanism of girth weld and practical pipeline engineering application.http://www.sciencedirect.com/science/article/pii/S2238785424002837X80 girth weld metalIntercritical quenching-tempering treatmentRetained austenite(Nb,Ti)C precipitateFracture toughnessCrack tip |
| spellingShingle | Ce Wang Chengning Li Lianshuang Dai Xiaocong Yang Jiawei Han Shaohua Cui Zhenwen Yang Xinjie Di Simultaneously enhancing strength and fracture toughness via tailoring the microstructure in X80 girth weld metal Journal of Materials Research and Technology X80 girth weld metal Intercritical quenching-tempering treatment Retained austenite (Nb,Ti)C precipitate Fracture toughness Crack tip |
| title | Simultaneously enhancing strength and fracture toughness via tailoring the microstructure in X80 girth weld metal |
| title_full | Simultaneously enhancing strength and fracture toughness via tailoring the microstructure in X80 girth weld metal |
| title_fullStr | Simultaneously enhancing strength and fracture toughness via tailoring the microstructure in X80 girth weld metal |
| title_full_unstemmed | Simultaneously enhancing strength and fracture toughness via tailoring the microstructure in X80 girth weld metal |
| title_short | Simultaneously enhancing strength and fracture toughness via tailoring the microstructure in X80 girth weld metal |
| title_sort | simultaneously enhancing strength and fracture toughness via tailoring the microstructure in x80 girth weld metal |
| topic | X80 girth weld metal Intercritical quenching-tempering treatment Retained austenite (Nb,Ti)C precipitate Fracture toughness Crack tip |
| url | http://www.sciencedirect.com/science/article/pii/S2238785424002837 |
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