Microstructure evolution and dynamic mechanical behavior of laser welded dissimilar joint between QP1180 and TRIP780
The present work investigates dissimilar fiber laser joints between QP1180 and TRIP780 steels. The scanning electron microscope (SEM) and electron back-scattered diffraction (EBSD) characterizations were conducted to study the detailed microstructures of each region of the joints. The result showed...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
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Elsevier
2022-01-01
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| Series: | Journal of Materials Research and Technology |
| Subjects: | |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S2238785421015192 |
| _version_ | 1818975825668603904 |
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| author | Yue Wu Yanbing Guo Wang Zhang Liqun Li |
| author_facet | Yue Wu Yanbing Guo Wang Zhang Liqun Li |
| author_sort | Yue Wu |
| collection | DOAJ |
| description | The present work investigates dissimilar fiber laser joints between QP1180 and TRIP780 steels. The scanning electron microscope (SEM) and electron back-scattered diffraction (EBSD) characterizations were conducted to study the detailed microstructures of each region of the joints. The result showed that a large volume fraction of tempered martensite (TM) is responsible for the softened zone in the inter-critical heat-affected zone at the QP1180 side of the joints. The digital image correlation (DIC) technique demonstrated that the softened zone triggered by TM in the heat-affected zone (HAZ) at the QP1180 side has little effect on the tensile mechanical properties because of the higher hardness than at the TRIP780 side. The dimples on the fracture surface and higher elongation of the tensile samples show good ductility, which is due to the TRIP effect. The formability of dissimilar weld joints was characterized by the Erichsen cupping test. The Erichsen values varied at different punch pole locations due to the softening zone and non-uniform microstructure on the two sides of HAZ. |
| first_indexed | 2024-12-20T16:02:07Z |
| format | Article |
| id | doaj.art-8512b26df981408bafeb61fbf9c4a326 |
| institution | Directory Open Access Journal |
| issn | 2238-7854 |
| language | English |
| last_indexed | 2024-12-20T16:02:07Z |
| publishDate | 2022-01-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Journal of Materials Research and Technology |
| spelling | doaj.art-8512b26df981408bafeb61fbf9c4a3262022-12-21T19:34:14ZengElsevierJournal of Materials Research and Technology2238-78542022-01-0116977987Microstructure evolution and dynamic mechanical behavior of laser welded dissimilar joint between QP1180 and TRIP780Yue Wu0Yanbing Guo1Wang Zhang2Liqun Li3School of Materials Engineering, Shanghai Dianji University, Shanghai, 201306, ChinaSchool of Materials Engineering, Shanghai Dianji University, Shanghai, 201306, China; Shanghai Key Lab of Materials Laser Processing and Modification, School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai, 200240, China; Corresponding author.School of Materials Engineering, Shanghai Dianji University, Shanghai, 201306, ChinaState Key Laboratory of Advanced Welding and Joining, Harbin Institute of Technology, Haerbin, 150001, ChinaThe present work investigates dissimilar fiber laser joints between QP1180 and TRIP780 steels. The scanning electron microscope (SEM) and electron back-scattered diffraction (EBSD) characterizations were conducted to study the detailed microstructures of each region of the joints. The result showed that a large volume fraction of tempered martensite (TM) is responsible for the softened zone in the inter-critical heat-affected zone at the QP1180 side of the joints. The digital image correlation (DIC) technique demonstrated that the softened zone triggered by TM in the heat-affected zone (HAZ) at the QP1180 side has little effect on the tensile mechanical properties because of the higher hardness than at the TRIP780 side. The dimples on the fracture surface and higher elongation of the tensile samples show good ductility, which is due to the TRIP effect. The formability of dissimilar weld joints was characterized by the Erichsen cupping test. The Erichsen values varied at different punch pole locations due to the softening zone and non-uniform microstructure on the two sides of HAZ.http://www.sciencedirect.com/science/article/pii/S2238785421015192Dissimilar weld jointsQP1180TRIP780Softened zoneTensile propertiesFormability |
| spellingShingle | Yue Wu Yanbing Guo Wang Zhang Liqun Li Microstructure evolution and dynamic mechanical behavior of laser welded dissimilar joint between QP1180 and TRIP780 Journal of Materials Research and Technology Dissimilar weld joints QP1180 TRIP780 Softened zone Tensile properties Formability |
| title | Microstructure evolution and dynamic mechanical behavior of laser welded dissimilar joint between QP1180 and TRIP780 |
| title_full | Microstructure evolution and dynamic mechanical behavior of laser welded dissimilar joint between QP1180 and TRIP780 |
| title_fullStr | Microstructure evolution and dynamic mechanical behavior of laser welded dissimilar joint between QP1180 and TRIP780 |
| title_full_unstemmed | Microstructure evolution and dynamic mechanical behavior of laser welded dissimilar joint between QP1180 and TRIP780 |
| title_short | Microstructure evolution and dynamic mechanical behavior of laser welded dissimilar joint between QP1180 and TRIP780 |
| title_sort | microstructure evolution and dynamic mechanical behavior of laser welded dissimilar joint between qp1180 and trip780 |
| topic | Dissimilar weld joints QP1180 TRIP780 Softened zone Tensile properties Formability |
| url | http://www.sciencedirect.com/science/article/pii/S2238785421015192 |
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