Improving the Weld Heat-Affected-Zone (HAZ) Toughness of High-Strength Thick-Walled Line Pipes
The low-temperature fracture toughness of double-V weld seams is a well-known challenge due to the essential increased heat input for heavy-wall pipelines. A thorough investigation was conducted to explore the impact of the heat input on the grain size and precipitate coarsening, correlating the mic...
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MDPI AG
2023-12-01
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| 丛编: | Metals |
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| 在线阅读: | https://www.mdpi.com/2075-4701/13/12/2018 |
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| author | Yan Ma Lihong Su Chen Shen Leigh Fletcher Huijun Li Leilei Sun Lei Zheng Chuanguo Zhang |
| author_facet | Yan Ma Lihong Su Chen Shen Leigh Fletcher Huijun Li Leilei Sun Lei Zheng Chuanguo Zhang |
| author_sort | Yan Ma |
| collection | DOAJ |
| description | The low-temperature fracture toughness of double-V weld seams is a well-known challenge due to the essential increased heat input for heavy-wall pipelines. A thorough investigation was conducted to explore the impact of the heat input on the grain size and precipitate coarsening, correlating the microstructure with the heat-affected-zone (HAZ) toughness. The results indicated that the actual weldments showed a toughness transition zone at −20 °C, with considerable scattering in Charpy V-notch (CVN) tests. Gleeble thermal simulations confirmed the decreased toughness of the coarse-grained HAZ (CGHAZ) with increasing heat input and prior austenite grain size (PAGS). A specially designed thermal treatment demonstrated its potential for enhancing the toughness of the CGHAZ, with the recommended thermal cycle involving peak temperatures of 700 and 800 °C, holding for 1 s, and rapid cooling. The toughness of the intercritically reheated CGHAZ (ICCGHAZ) improved with higher intercritical reheating temperatures and the removal of necklace-type M–A constituents along the PAG. Despite various thermal treatments, no significant improvements were observed in the toughness of the ICCGHAZ. Future work was suggested for optimising the use of tack welds to reduce the effective heat input (HI) associated with double-sided submerged arc welding (SAW). |
| first_indexed | 2024-03-08T20:31:44Z |
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| id | doaj.art-31d754349a48447b8c89fc24ef1a7fae |
| institution | Directory Open Access Journal |
| issn | 2075-4701 |
| language | English |
| last_indexed | 2024-03-08T20:31:44Z |
| publishDate | 2023-12-01 |
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| series | Metals |
| spelling | doaj.art-31d754349a48447b8c89fc24ef1a7fae2023-12-22T14:24:51ZengMDPI AGMetals2075-47012023-12-011312201810.3390/met13122018Improving the Weld Heat-Affected-Zone (HAZ) Toughness of High-Strength Thick-Walled Line PipesYan Ma0Lihong Su1Chen Shen2Leigh Fletcher3Huijun Li4Leilei Sun5Lei Zheng6Chuanguo Zhang7School of Mechanical, Materials, Mechatronic and Biomedical Engineering, Faculty of Engineering & Information Sciences, University of Wollongong, Wollongong, NSW 2522, AustraliaSchool of Mechanical, Materials, Mechatronic and Biomedical Engineering, Faculty of Engineering & Information Sciences, University of Wollongong, Wollongong, NSW 2522, AustraliaShanghai Key Laboratory of Materials Laser Processing and Modification, School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, ChinaSchool of Mechanical, Materials, Mechatronic and Biomedical Engineering, Faculty of Engineering & Information Sciences, University of Wollongong, Wollongong, NSW 2522, AustraliaSchool of Mechanical, Materials, Mechatronic and Biomedical Engineering, Faculty of Engineering & Information Sciences, University of Wollongong, Wollongong, NSW 2522, AustraliaBaosteel Research Institute, Baoshan Iron & Steel Co., Ltd., Shanghai 201900, ChinaBaosteel Research Institute, Baoshan Iron & Steel Co., Ltd., Shanghai 201900, ChinaBaosteel Research Institute, Baoshan Iron & Steel Co., Ltd., Shanghai 201900, ChinaThe low-temperature fracture toughness of double-V weld seams is a well-known challenge due to the essential increased heat input for heavy-wall pipelines. A thorough investigation was conducted to explore the impact of the heat input on the grain size and precipitate coarsening, correlating the microstructure with the heat-affected-zone (HAZ) toughness. The results indicated that the actual weldments showed a toughness transition zone at −20 °C, with considerable scattering in Charpy V-notch (CVN) tests. Gleeble thermal simulations confirmed the decreased toughness of the coarse-grained HAZ (CGHAZ) with increasing heat input and prior austenite grain size (PAGS). A specially designed thermal treatment demonstrated its potential for enhancing the toughness of the CGHAZ, with the recommended thermal cycle involving peak temperatures of 700 and 800 °C, holding for 1 s, and rapid cooling. The toughness of the intercritically reheated CGHAZ (ICCGHAZ) improved with higher intercritical reheating temperatures and the removal of necklace-type M–A constituents along the PAG. Despite various thermal treatments, no significant improvements were observed in the toughness of the ICCGHAZ. Future work was suggested for optimising the use of tack welds to reduce the effective heat input (HI) associated with double-sided submerged arc welding (SAW).https://www.mdpi.com/2075-4701/13/12/2018thick-walled pipelineweldingHAZmicrostructurelow-temperature toughnessheat input |
| spellingShingle | Yan Ma Lihong Su Chen Shen Leigh Fletcher Huijun Li Leilei Sun Lei Zheng Chuanguo Zhang Improving the Weld Heat-Affected-Zone (HAZ) Toughness of High-Strength Thick-Walled Line Pipes Metals thick-walled pipeline welding HAZ microstructure low-temperature toughness heat input |
| title | Improving the Weld Heat-Affected-Zone (HAZ) Toughness of High-Strength Thick-Walled Line Pipes |
| title_full | Improving the Weld Heat-Affected-Zone (HAZ) Toughness of High-Strength Thick-Walled Line Pipes |
| title_fullStr | Improving the Weld Heat-Affected-Zone (HAZ) Toughness of High-Strength Thick-Walled Line Pipes |
| title_full_unstemmed | Improving the Weld Heat-Affected-Zone (HAZ) Toughness of High-Strength Thick-Walled Line Pipes |
| title_short | Improving the Weld Heat-Affected-Zone (HAZ) Toughness of High-Strength Thick-Walled Line Pipes |
| title_sort | improving the weld heat affected zone haz toughness of high strength thick walled line pipes |
| topic | thick-walled pipeline welding HAZ microstructure low-temperature toughness heat input |
| url | https://www.mdpi.com/2075-4701/13/12/2018 |
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