Influence of ICCGHAZ on the Low-Temperature Toughness in HAZ of Heavy-Wall X80 Pipeline Steel
Low-temperature embrittlement in the heat-affected zone (HAZ) of heavy-wall X80 weld joints is a primary challenge for arctic oil & gas exploitation. In this paper, the influence of intercritically reheated coarse-grained HAZ (ICCGHAZ) on the low-temperature toughness of the weld joint in a 22 m...
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MDPI AG
2022-05-01
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| Series: | Metals |
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| Online Access: | https://www.mdpi.com/2075-4701/12/6/907 |
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| author | Chao Fu Xueda Li Haichuan Li Tao Han Bin Han Yong Wang |
| author_facet | Chao Fu Xueda Li Haichuan Li Tao Han Bin Han Yong Wang |
| author_sort | Chao Fu |
| collection | DOAJ |
| description | Low-temperature embrittlement in the heat-affected zone (HAZ) of heavy-wall X80 weld joints is a primary challenge for arctic oil & gas exploitation. In this paper, the influence of intercritically reheated coarse-grained HAZ (ICCGHAZ) on the low-temperature toughness of the weld joint in a 22 mm thick X80 spiral submerged arc welded pipe was studied through instrumented Charpy V-notch impact test at −80~20 °C and corresponding fracture surface characterization. The results indicated that the influence of ICCGHAZ on the overall toughness of the weld joint is related to temperature. At temperatures below −45 °C, individual and tiny martensite-austenite (MA) constituent debonding can trigger cleavage fracture–which was proved to be nucleation-controlled–and the probability of embrittlement of the ICCGHAZ increases. At temperatures higher than −45 °C, only relatively large or closely distributed MA constituent in ICCGHAZ satisfies the conditions to trigger propagation-controlled cleavage fractures, and the influence of ICCGHAZ on the overall toughness is not remarkable. |
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| id | doaj.art-cc4c7ca12c2e40ad87f86a1808b73e71 |
| institution | Directory Open Access Journal |
| issn | 2075-4701 |
| language | English |
| last_indexed | 2024-03-09T23:04:21Z |
| publishDate | 2022-05-01 |
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| spelling | doaj.art-cc4c7ca12c2e40ad87f86a1808b73e712023-11-23T17:57:05ZengMDPI AGMetals2075-47012022-05-0112690710.3390/met12060907Influence of ICCGHAZ on the Low-Temperature Toughness in HAZ of Heavy-Wall X80 Pipeline SteelChao Fu0Xueda Li1Haichuan Li2Tao Han3Bin Han4Yong Wang5College of New Energy, China University of Petroleum (East China), Qingdao 266580, ChinaSchool of Materials Science and Engineering, China University of Petroleum (East China), Qingdao 266580, ChinaPipeChina West East Gas Pipeline Company, Shanghai 200122, ChinaSchool of Materials Science and Engineering, China University of Petroleum (East China), Qingdao 266580, ChinaSchool of Materials Science and Engineering, China University of Petroleum (East China), Qingdao 266580, ChinaSchool of Materials Science and Engineering, China University of Petroleum (East China), Qingdao 266580, ChinaLow-temperature embrittlement in the heat-affected zone (HAZ) of heavy-wall X80 weld joints is a primary challenge for arctic oil & gas exploitation. In this paper, the influence of intercritically reheated coarse-grained HAZ (ICCGHAZ) on the low-temperature toughness of the weld joint in a 22 mm thick X80 spiral submerged arc welded pipe was studied through instrumented Charpy V-notch impact test at −80~20 °C and corresponding fracture surface characterization. The results indicated that the influence of ICCGHAZ on the overall toughness of the weld joint is related to temperature. At temperatures below −45 °C, individual and tiny martensite-austenite (MA) constituent debonding can trigger cleavage fracture–which was proved to be nucleation-controlled–and the probability of embrittlement of the ICCGHAZ increases. At temperatures higher than −45 °C, only relatively large or closely distributed MA constituent in ICCGHAZ satisfies the conditions to trigger propagation-controlled cleavage fractures, and the influence of ICCGHAZ on the overall toughness is not remarkable.https://www.mdpi.com/2075-4701/12/6/907pipeline steellow-temperature toughnessICCGHAZLBZArctic regions |
| spellingShingle | Chao Fu Xueda Li Haichuan Li Tao Han Bin Han Yong Wang Influence of ICCGHAZ on the Low-Temperature Toughness in HAZ of Heavy-Wall X80 Pipeline Steel Metals pipeline steel low-temperature toughness ICCGHAZ LBZ Arctic regions |
| title | Influence of ICCGHAZ on the Low-Temperature Toughness in HAZ of Heavy-Wall X80 Pipeline Steel |
| title_full | Influence of ICCGHAZ on the Low-Temperature Toughness in HAZ of Heavy-Wall X80 Pipeline Steel |
| title_fullStr | Influence of ICCGHAZ on the Low-Temperature Toughness in HAZ of Heavy-Wall X80 Pipeline Steel |
| title_full_unstemmed | Influence of ICCGHAZ on the Low-Temperature Toughness in HAZ of Heavy-Wall X80 Pipeline Steel |
| title_short | Influence of ICCGHAZ on the Low-Temperature Toughness in HAZ of Heavy-Wall X80 Pipeline Steel |
| title_sort | influence of iccghaz on the low temperature toughness in haz of heavy wall x80 pipeline steel |
| topic | pipeline steel low-temperature toughness ICCGHAZ LBZ Arctic regions |
| url | https://www.mdpi.com/2075-4701/12/6/907 |
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