Microstructures and mechanical properties of powder-filled laser welding joints composed of high-nitrogen steel
In this work, a permanent connection of a high-nitrogen steel plate is achieved by using layer-by-layer powder-filled laser welding of high-nitrogen steel powder, and the stability levels of the welding process, microstructures and mechanical properties are analyzed. Compared with other processes, p...
| Main Authors: | , , , , , , , |
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| Format: | Article |
| Language: | English |
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Elsevier
2023-09-01
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| Series: | Journal of Materials Research and Technology |
| Subjects: | |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S2238785423019282 |
| _version_ | 1797646701030277120 |
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| author | Lei Wang Xiaotian Zhang Yichen Li Zhenwen Chen He Li Yong Peng Dongqing Yang Kehong Wang |
| author_facet | Lei Wang Xiaotian Zhang Yichen Li Zhenwen Chen He Li Yong Peng Dongqing Yang Kehong Wang |
| author_sort | Lei Wang |
| collection | DOAJ |
| description | In this work, a permanent connection of a high-nitrogen steel plate is achieved by using layer-by-layer powder-filled laser welding of high-nitrogen steel powder, and the stability levels of the welding process, microstructures and mechanical properties are analyzed. Compared with other processes, powder-filled laser welding is smooth without bursts and spatters, and the nitrogen content of the welding seam is obviously improved. The welding seam consists mainly of austenite, with few ferrite and manganese oxides. There is a nitrogen concentration gradient between the inside and the upper part of the melt pool, which leads to nitrogen escape. Laser remelting exacerbates this process, resulting in more severe nitrogen loss in the bottom layer than in the upper layer of the welding seam. The differences in the nitrogen solubilities in austenite and ferrite and the high-nitrogen content in the melt pool are the main reasons for the formation of micropores. Tensile experiments and impact experiments are conducted on the welding joint. The average tensile strength and elongation of the welding joint are 1032.36 MPa and 19.70%, respectively, contributing to 94% and 53.4% of the total values for the base metal. The grain refinement and relatively high nitrogen content are the reasons for the better tensile strength relative to other processes. The average impact energy of the welding joint is 24.68 J, which is approximately 63.74% of the base metal. Pores are the main reason for the reduced impact energy of the welding joint. |
| first_indexed | 2024-03-11T15:05:27Z |
| format | Article |
| id | doaj.art-172b67d9c4744efbaec96d28c0dd8d16 |
| institution | Directory Open Access Journal |
| issn | 2238-7854 |
| language | English |
| last_indexed | 2024-03-11T15:05:27Z |
| publishDate | 2023-09-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Journal of Materials Research and Technology |
| spelling | doaj.art-172b67d9c4744efbaec96d28c0dd8d162023-10-30T06:03:30ZengElsevierJournal of Materials Research and Technology2238-78542023-09-012629072918Microstructures and mechanical properties of powder-filled laser welding joints composed of high-nitrogen steelLei Wang0Xiaotian Zhang1Yichen Li2Zhenwen Chen3He Li4Yong Peng5Dongqing Yang6Kehong Wang7School of Materials Science and Engineering, Nanjing University of Science and Technology, Nanjing, 210094, China; Key Laboratory of Controlled Arc Intelligent Additive Manufacturing Technology, Nanjing University of Science and Technology, Nanjing 210094, China; Corresponding author. School of Materials Science and Engineering, Nanjing University of Science and Technology, Nanjing, 210094, China.School of Materials Science and Engineering, Nanjing University of Science and Technology, Nanjing, 210094, ChinaSchool of Materials Science and Engineering, Nanjing University of Science and Technology, Nanjing, 210094, ChinaSchool of Materials Science and Engineering, Nanjing University of Science and Technology, Nanjing, 210094, ChinaSchool of Materials Science and Engineering, Nanjing University of Science and Technology, Nanjing, 210094, ChinaSchool of Materials Science and Engineering, Nanjing University of Science and Technology, Nanjing, 210094, China; Key Laboratory of Controlled Arc Intelligent Additive Manufacturing Technology, Nanjing University of Science and Technology, Nanjing 210094, ChinaSchool of Materials Science and Engineering, Nanjing University of Science and Technology, Nanjing, 210094, China; Key Laboratory of Controlled Arc Intelligent Additive Manufacturing Technology, Nanjing University of Science and Technology, Nanjing 210094, ChinaSchool of Materials Science and Engineering, Nanjing University of Science and Technology, Nanjing, 210094, China; Key Laboratory of Controlled Arc Intelligent Additive Manufacturing Technology, Nanjing University of Science and Technology, Nanjing 210094, ChinaIn this work, a permanent connection of a high-nitrogen steel plate is achieved by using layer-by-layer powder-filled laser welding of high-nitrogen steel powder, and the stability levels of the welding process, microstructures and mechanical properties are analyzed. Compared with other processes, powder-filled laser welding is smooth without bursts and spatters, and the nitrogen content of the welding seam is obviously improved. The welding seam consists mainly of austenite, with few ferrite and manganese oxides. There is a nitrogen concentration gradient between the inside and the upper part of the melt pool, which leads to nitrogen escape. Laser remelting exacerbates this process, resulting in more severe nitrogen loss in the bottom layer than in the upper layer of the welding seam. The differences in the nitrogen solubilities in austenite and ferrite and the high-nitrogen content in the melt pool are the main reasons for the formation of micropores. Tensile experiments and impact experiments are conducted on the welding joint. The average tensile strength and elongation of the welding joint are 1032.36 MPa and 19.70%, respectively, contributing to 94% and 53.4% of the total values for the base metal. The grain refinement and relatively high nitrogen content are the reasons for the better tensile strength relative to other processes. The average impact energy of the welding joint is 24.68 J, which is approximately 63.74% of the base metal. Pores are the main reason for the reduced impact energy of the welding joint.http://www.sciencedirect.com/science/article/pii/S2238785423019282Powder-filled laser weldingHigh nitrogen steelMicrostructureMechanical properties |
| spellingShingle | Lei Wang Xiaotian Zhang Yichen Li Zhenwen Chen He Li Yong Peng Dongqing Yang Kehong Wang Microstructures and mechanical properties of powder-filled laser welding joints composed of high-nitrogen steel Journal of Materials Research and Technology Powder-filled laser welding High nitrogen steel Microstructure Mechanical properties |
| title | Microstructures and mechanical properties of powder-filled laser welding joints composed of high-nitrogen steel |
| title_full | Microstructures and mechanical properties of powder-filled laser welding joints composed of high-nitrogen steel |
| title_fullStr | Microstructures and mechanical properties of powder-filled laser welding joints composed of high-nitrogen steel |
| title_full_unstemmed | Microstructures and mechanical properties of powder-filled laser welding joints composed of high-nitrogen steel |
| title_short | Microstructures and mechanical properties of powder-filled laser welding joints composed of high-nitrogen steel |
| title_sort | microstructures and mechanical properties of powder filled laser welding joints composed of high nitrogen steel |
| topic | Powder-filled laser welding High nitrogen steel Microstructure Mechanical properties |
| url | http://www.sciencedirect.com/science/article/pii/S2238785423019282 |
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