Microstructure evolution and shear strength in CoCrFeNi/AISI 304 joint by vacuum brazing with BNi-2 filler metal
CoCrFeNi high entropy alloy (HEA) is endowed with a series of outstanding properties, such as excellent tensile performance, good resistance to cryogenic and corrosion, due to its unique chemical composition and crystal structure. The joining of CoCrFeNi HEA alloy with AISI 304 stainless steel is of...
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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/S2238785424027042 |
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| author | Xueting Zhang Juan Wang Qiang Xu Kun Liu Guoliang Qin |
| author_facet | Xueting Zhang Juan Wang Qiang Xu Kun Liu Guoliang Qin |
| author_sort | Xueting Zhang |
| collection | DOAJ |
| description | CoCrFeNi high entropy alloy (HEA) is endowed with a series of outstanding properties, such as excellent tensile performance, good resistance to cryogenic and corrosion, due to its unique chemical composition and crystal structure. The joining of CoCrFeNi HEA alloy with AISI 304 stainless steel is of vital significance for producing complex engineering components available to extreme conditions. In this work, the brazing of CoCrFeNi HEA and AISI 304 steel was conducted by BNi-2 filler metal in a vacuum of 10−4Pa, and a CoCrFeNi/AISI 304 joint was obtained. The interfacial microstructure evolution, brazing mechanism, and mechanical properties of the joints were evaluated. The results indicate that three zones are formed in the brazing seam between CoCrFeNi and AISI 304, including an athermal solidification zone (ASZ) with CrB precipitates distributed in the center of the joint, an isothermal solidification zone (ISZ) with nickel-based solid solutions, and a diffusion affected zone (DAZ) near the base metals. The widths of ISZ and DAZ increase with the increase of brazing temperature. The shear test results show that excellent bonding occurs in the CoCrFeNi/AISI 304 joint with a maximum shear strength of 237 MPa by controlling brazing temperature at 1120 °C. At the same time, B in BNi-2 filler metal diffuses to the two base metals, resulting in a fine-grained structure and improving improve the interfacial bonding. |
| format | Article |
| id | doaj-art-765f029730d34fa4b81ccc0718f5220f |
| institution | OA Journals |
| 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-765f029730d34fa4b81ccc0718f5220f2025-08-20T01:57:20ZengElsevierJournal of Materials Research and Technology2238-78542024-11-01338425843410.1016/j.jmrt.2024.11.176Microstructure evolution and shear strength in CoCrFeNi/AISI 304 joint by vacuum brazing with BNi-2 filler metalXueting Zhang0Juan Wang1Qiang Xu2Kun Liu3Guoliang Qin4Key Laboratory for Liquid-Solid Structural Evolution and Processing of Materials (Ministry of Education), Shandong University, Jinan, 250061, ChinaKey Laboratory for Liquid-Solid Structural Evolution and Processing of Materials (Ministry of Education), Shandong University, Jinan, 250061, China; Corresponding author.School of Engineering and Technology, Nanchang Vocational University, Nanchang, 330007, ChinaSchool of Materials Science and Engineering, Jiangsu University of Science and Technology, Zhenjiang, 212100, ChinaKey Laboratory for Liquid-Solid Structural Evolution and Processing of Materials (Ministry of Education), Shandong University, Jinan, 250061, ChinaCoCrFeNi high entropy alloy (HEA) is endowed with a series of outstanding properties, such as excellent tensile performance, good resistance to cryogenic and corrosion, due to its unique chemical composition and crystal structure. The joining of CoCrFeNi HEA alloy with AISI 304 stainless steel is of vital significance for producing complex engineering components available to extreme conditions. In this work, the brazing of CoCrFeNi HEA and AISI 304 steel was conducted by BNi-2 filler metal in a vacuum of 10−4Pa, and a CoCrFeNi/AISI 304 joint was obtained. The interfacial microstructure evolution, brazing mechanism, and mechanical properties of the joints were evaluated. The results indicate that three zones are formed in the brazing seam between CoCrFeNi and AISI 304, including an athermal solidification zone (ASZ) with CrB precipitates distributed in the center of the joint, an isothermal solidification zone (ISZ) with nickel-based solid solutions, and a diffusion affected zone (DAZ) near the base metals. The widths of ISZ and DAZ increase with the increase of brazing temperature. The shear test results show that excellent bonding occurs in the CoCrFeNi/AISI 304 joint with a maximum shear strength of 237 MPa by controlling brazing temperature at 1120 °C. At the same time, B in BNi-2 filler metal diffuses to the two base metals, resulting in a fine-grained structure and improving improve the interfacial bonding.http://www.sciencedirect.com/science/article/pii/S2238785424027042CoCrFeNi high-entropy alloysAISI 304 stainless steelVacuum brazingInterfacial microstructureShear strength |
| spellingShingle | Xueting Zhang Juan Wang Qiang Xu Kun Liu Guoliang Qin Microstructure evolution and shear strength in CoCrFeNi/AISI 304 joint by vacuum brazing with BNi-2 filler metal Journal of Materials Research and Technology CoCrFeNi high-entropy alloys AISI 304 stainless steel Vacuum brazing Interfacial microstructure Shear strength |
| title | Microstructure evolution and shear strength in CoCrFeNi/AISI 304 joint by vacuum brazing with BNi-2 filler metal |
| title_full | Microstructure evolution and shear strength in CoCrFeNi/AISI 304 joint by vacuum brazing with BNi-2 filler metal |
| title_fullStr | Microstructure evolution and shear strength in CoCrFeNi/AISI 304 joint by vacuum brazing with BNi-2 filler metal |
| title_full_unstemmed | Microstructure evolution and shear strength in CoCrFeNi/AISI 304 joint by vacuum brazing with BNi-2 filler metal |
| title_short | Microstructure evolution and shear strength in CoCrFeNi/AISI 304 joint by vacuum brazing with BNi-2 filler metal |
| title_sort | microstructure evolution and shear strength in cocrfeni aisi 304 joint by vacuum brazing with bni 2 filler metal |
| topic | CoCrFeNi high-entropy alloys AISI 304 stainless steel Vacuum brazing Interfacial microstructure Shear strength |
| url | http://www.sciencedirect.com/science/article/pii/S2238785424027042 |
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