Unravelling microstructure evolution induced mechanical responses in welded joints of QN1803 steel subjected to varied heat inputs
In this work, QN1803 steel plates were connected with butt welding. Electron beam welding (EBW) was utilized with different beam currents. The impact of beam current on the properties and microstructure of the joints was investigated completely. The results indicate that sound joints could be obtain...
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Elsevier
2024-11-01
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| Series: | Journal of Materials Research and Technology |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S2238785424027522 |
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| author | Xingxing Wang Yuanlong Jiang Honggang Dong Jiahao Tian Shuai Li Kunming Pan Zhipeng Yuan Zicheng Ling Xu Xie Jianjun Shi |
| author_facet | Xingxing Wang Yuanlong Jiang Honggang Dong Jiahao Tian Shuai Li Kunming Pan Zhipeng Yuan Zicheng Ling Xu Xie Jianjun Shi |
| author_sort | Xingxing Wang |
| collection | DOAJ |
| description | In this work, QN1803 steel plates were connected with butt welding. Electron beam welding (EBW) was utilized with different beam currents. The impact of beam current on the properties and microstructure of the joints was investigated completely. The results indicate that sound joints could be obtained with these beam currents. And the joints with 47 and 52 mA currents exhibited the optimal strengths. The joint with 52 mA exhibited the maximal impact work (287 J). The joints include transition zone (TZ) and fusion zone (FZ). These zones mainly are composed of TZ-columnar dendritic and FZ-equiaxed dendritic structure. These samples all exhibited finer grains and lower ferrite content compared to the base material (BM). As the heat input increased, the fine grain strengthening effect gradually became weak, leading to defects in the weld seam. Due to the fine grain strengthening and dislocation strengthening effects, these joints with 47 and 52 mA exhibited higher tensile strength than BM. However, for the joints with 42 and 57 mA, fractures occurred in the weld seam owing to defects. The dislocations and fine grain could make cracks extend into the BM. However, for the joint with 52 mA, the impact toughness could reach 281 J, which is still lower than that of BM (304 J). |
| format | Article |
| id | doaj-art-20150183f1ba468b929e6570406f938c |
| institution | Kabale University |
| issn | 2238-7854 |
| language | English |
| publishDate | 2024-11-01 |
| publisher | Elsevier |
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| series | Journal of Materials Research and Technology |
| spelling | doaj-art-20150183f1ba468b929e6570406f938c2024-12-26T08:56:01ZengElsevierJournal of Materials Research and Technology2238-78542024-11-013388548867Unravelling microstructure evolution induced mechanical responses in welded joints of QN1803 steel subjected to varied heat inputsXingxing Wang0Yuanlong Jiang1Honggang Dong2Jiahao Tian3Shuai Li4Kunming Pan5Zhipeng Yuan6Zicheng Ling7Xu Xie8Jianjun Shi9Henan International Joint Laboratory of High-efficiency Special Green Welding, North China University of Water Resources and Electric Power, Zhengzhou, 450045, PR China; Corresponding author.Henan International Joint Laboratory of High-efficiency Special Green Welding, North China University of Water Resources and Electric Power, Zhengzhou, 450045, PR ChinaSchool of Materials Science and Engineering, Dalian University of Technology, Dalian, 116024, PR China; Corresponding author.Luoyang Cigarette Factory of Henan China Tobacco Industry Co., Ltd., Luoyang, 471000, PR ChinaHenan International Joint Laboratory of High-efficiency Special Green Welding, North China University of Water Resources and Electric Power, Zhengzhou, 450045, PR ChinaLongmen Laboratory, Luoyang, 471003, PR ChinaHenan International Joint Laboratory of High-efficiency Special Green Welding, North China University of Water Resources and Electric Power, Zhengzhou, 450045, PR ChinaHenan International Joint Laboratory of High-efficiency Special Green Welding, North China University of Water Resources and Electric Power, Zhengzhou, 450045, PR ChinaHenan International Joint Laboratory of High-efficiency Special Green Welding, North China University of Water Resources and Electric Power, Zhengzhou, 450045, PR ChinaHenan International Joint Laboratory of High-efficiency Special Green Welding, North China University of Water Resources and Electric Power, Zhengzhou, 450045, PR ChinaIn this work, QN1803 steel plates were connected with butt welding. Electron beam welding (EBW) was utilized with different beam currents. The impact of beam current on the properties and microstructure of the joints was investigated completely. The results indicate that sound joints could be obtained with these beam currents. And the joints with 47 and 52 mA currents exhibited the optimal strengths. The joint with 52 mA exhibited the maximal impact work (287 J). The joints include transition zone (TZ) and fusion zone (FZ). These zones mainly are composed of TZ-columnar dendritic and FZ-equiaxed dendritic structure. These samples all exhibited finer grains and lower ferrite content compared to the base material (BM). As the heat input increased, the fine grain strengthening effect gradually became weak, leading to defects in the weld seam. Due to the fine grain strengthening and dislocation strengthening effects, these joints with 47 and 52 mA exhibited higher tensile strength than BM. However, for the joints with 42 and 57 mA, fractures occurred in the weld seam owing to defects. The dislocations and fine grain could make cracks extend into the BM. However, for the joint with 52 mA, the impact toughness could reach 281 J, which is still lower than that of BM (304 J).http://www.sciencedirect.com/science/article/pii/S2238785424027522QN1803 steelElectron beam weldingHeat input |
| spellingShingle | Xingxing Wang Yuanlong Jiang Honggang Dong Jiahao Tian Shuai Li Kunming Pan Zhipeng Yuan Zicheng Ling Xu Xie Jianjun Shi Unravelling microstructure evolution induced mechanical responses in welded joints of QN1803 steel subjected to varied heat inputs Journal of Materials Research and Technology QN1803 steel Electron beam welding Heat input |
| title | Unravelling microstructure evolution induced mechanical responses in welded joints of QN1803 steel subjected to varied heat inputs |
| title_full | Unravelling microstructure evolution induced mechanical responses in welded joints of QN1803 steel subjected to varied heat inputs |
| title_fullStr | Unravelling microstructure evolution induced mechanical responses in welded joints of QN1803 steel subjected to varied heat inputs |
| title_full_unstemmed | Unravelling microstructure evolution induced mechanical responses in welded joints of QN1803 steel subjected to varied heat inputs |
| title_short | Unravelling microstructure evolution induced mechanical responses in welded joints of QN1803 steel subjected to varied heat inputs |
| title_sort | unravelling microstructure evolution induced mechanical responses in welded joints of qn1803 steel subjected to varied heat inputs |
| topic | QN1803 steel Electron beam welding Heat input |
| url | http://www.sciencedirect.com/science/article/pii/S2238785424027522 |
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