Effect of Heat Input on the Microstructure and Mechanical Properties of Local Dry Underwater Welded Duplex Stainless Steel
Duplex stainless steel welded metals were underwater local dry prepared on S32101 lean duplex stainless steel trapezoidal groove plates with a self-made drain cover employing Supercore 2205P flux-cored filler wire. Different heat inputs were employed to investigate the effects on mechanical characte...
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MDPI AG
2023-03-01
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| Online Access: | https://www.mdpi.com/1996-1944/16/6/2289 |
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| author | Yu Hu Yonghua Shi Kai Wang Jiqiang Huang |
| author_facet | Yu Hu Yonghua Shi Kai Wang Jiqiang Huang |
| author_sort | Yu Hu |
| collection | DOAJ |
| description | Duplex stainless steel welded metals were underwater local dry prepared on S32101 lean duplex stainless steel trapezoidal groove plates with a self-made drain cover employing Supercore 2205P flux-cored filler wire. Different heat inputs were employed to investigate the effects on mechanical characteristics and the microstructure of welded metals. The results demonstrated that as the heat was applied, austenite concentrations in the weld metals increased. It was found that the austenite concentration and the fraction of Σ3-austenite twin-grain boundaries followed the same trends. With increasing heat input, the recrystallized ferrite and austenite grains initially decreased and subsequently increased, whereas the fraction of interphase boundaries between special ferrite and austenite exhibited the reverse trend. With a heat input of 1.4 kJ/mm, the toughness and plasticity of the weld metals were enhanced by an increase in austenite content, Σ3 recrystallized grains, and austenite twin-grain boundaries. The plasticity and tensile strength values of the welded metal changed more when the heat input was raised from 1.0 to 1.2 kJ/mm than when it was raised from 1.2 to 1.4 kJ/mm. Considering energy conservation, it is recommended to adopt 1.2 kJ/mm for welding heat input. |
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| id | doaj.art-ac4dd85cf8db4e968b008ee6dbf0a925 |
| institution | Directory Open Access Journal |
| issn | 1996-1944 |
| language | English |
| last_indexed | 2024-03-11T06:15:33Z |
| publishDate | 2023-03-01 |
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| spelling | doaj.art-ac4dd85cf8db4e968b008ee6dbf0a9252023-11-17T12:20:09ZengMDPI AGMaterials1996-19442023-03-01166228910.3390/ma16062289Effect of Heat Input on the Microstructure and Mechanical Properties of Local Dry Underwater Welded Duplex Stainless SteelYu Hu0Yonghua Shi1Kai Wang2Jiqiang Huang3School of Mechatronic Engineering and Automation, Foshan University, Foshan 528231, ChinaSchool of Mechanical and Automotive Engineering, South China University of Technology, Guangzhou 510640, ChinaSchool of Mechatronic Engineering and Automation, Foshan University, Foshan 528231, ChinaSchool of Mechanical Engineering, Beijing Institute of Petrochemical Technology, Beijing 102627, ChinaDuplex stainless steel welded metals were underwater local dry prepared on S32101 lean duplex stainless steel trapezoidal groove plates with a self-made drain cover employing Supercore 2205P flux-cored filler wire. Different heat inputs were employed to investigate the effects on mechanical characteristics and the microstructure of welded metals. The results demonstrated that as the heat was applied, austenite concentrations in the weld metals increased. It was found that the austenite concentration and the fraction of Σ3-austenite twin-grain boundaries followed the same trends. With increasing heat input, the recrystallized ferrite and austenite grains initially decreased and subsequently increased, whereas the fraction of interphase boundaries between special ferrite and austenite exhibited the reverse trend. With a heat input of 1.4 kJ/mm, the toughness and plasticity of the weld metals were enhanced by an increase in austenite content, Σ3 recrystallized grains, and austenite twin-grain boundaries. The plasticity and tensile strength values of the welded metal changed more when the heat input was raised from 1.0 to 1.2 kJ/mm than when it was raised from 1.2 to 1.4 kJ/mm. Considering energy conservation, it is recommended to adopt 1.2 kJ/mm for welding heat input.https://www.mdpi.com/1996-1944/16/6/2289local dry underwater weldingduplex stainless steelflux-cored arc weldingmicrostructuremechanical performance |
| spellingShingle | Yu Hu Yonghua Shi Kai Wang Jiqiang Huang Effect of Heat Input on the Microstructure and Mechanical Properties of Local Dry Underwater Welded Duplex Stainless Steel Materials local dry underwater welding duplex stainless steel flux-cored arc welding microstructure mechanical performance |
| title | Effect of Heat Input on the Microstructure and Mechanical Properties of Local Dry Underwater Welded Duplex Stainless Steel |
| title_full | Effect of Heat Input on the Microstructure and Mechanical Properties of Local Dry Underwater Welded Duplex Stainless Steel |
| title_fullStr | Effect of Heat Input on the Microstructure and Mechanical Properties of Local Dry Underwater Welded Duplex Stainless Steel |
| title_full_unstemmed | Effect of Heat Input on the Microstructure and Mechanical Properties of Local Dry Underwater Welded Duplex Stainless Steel |
| title_short | Effect of Heat Input on the Microstructure and Mechanical Properties of Local Dry Underwater Welded Duplex Stainless Steel |
| title_sort | effect of heat input on the microstructure and mechanical properties of local dry underwater welded duplex stainless steel |
| topic | local dry underwater welding duplex stainless steel flux-cored arc welding microstructure mechanical performance |
| url | https://www.mdpi.com/1996-1944/16/6/2289 |
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