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Microstructure and mechanical properties of 304 stainless steel joints brazed by using BNi82CrSiB-xCu filler metals
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Jiejie GUO1, Huaxin LI1, 2, 3, Liangyi CAI1, Shuai ZHU4, Chuanyang LYU1, 2, 3, Yanming HE1, 2, 3, Jianguo YANG1, 2, 3
Journal of Materials Engineering | 2026, 54(1) : 168 - 177
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Journal of Materials Engineering | 2026, 54(1): 168-177
• RESEARCH ARTICLE •
Microstructure and mechanical properties of 304 stainless steel joints brazed by using BNi82CrSiB-xCu filler metals
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Jiejie GUO1, Huaxin LI1, 2, 3, Liangyi CAI1, Shuai ZHU4, Chuanyang LYU1, 2, 3, Yanming HE1, 2, 3, Jianguo YANG1, 2, 3
Affiliations
  • 1.Institute of Process Equipment and Control Engineering，Zhejiang University of Technology，Hangzhou 310023，China
  • 2.Engineering Research Center of Process Equipment and Remanufacturing，Ministry of Education，Zhejiang University of Technology，Hangzhou 310023，China
  • 3.College of Mechanical Engineering，Zhejiang University of Technology，Hangzhou 310023，China
  • 4.Shanghai Aerospace Equipment Manufacturing Co. ，Ltd. ，Shanghai 200245，China
Published: 2026-01-20 doi: 10.11868/j.issn.1001-4381.2023.000830
Outline
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To overcome the drawback of the brittle borides formed in the stainless steel joint brazed using Ni-based filler metals and further improve the mechanical properties of the joint， a small amount of Cu powders are added into the BNi-2 filler metal to suppress the formation of brittle borides in the joints. The 304 stainless steels are brazed using the BNi-2 and BNi-2 with Cu as filler metals， respectively. The influences of holding time， brazing temperature， and Cu content on the microstructure and mechanical properties of the brazed joints are investigated. The results indicate that for the BNi-2 filler metal， increasing the brazing temperature and time are favorable for reducing the boride content formed in the joint center. In addition， increasing the brazing temperature and time can accelerate the intergranular diffusion of borides， thereby leading to a degradation of joint shear strength. For the BNi-2 filler metal with Cu， when the Cu content is 1%（mass fraction，the same below）， the borides in the joint center are inhibited remarkably， forming a full Ni-based solid solution in the joint center. The joint shear strength obtained is （713.9±16.4） MPa， which is 19% higher than that of the joint without Cu additive. The joint failure occurs at the base metal/filler metal interface， recognized as a ductile fracture. However， when the Cu content increases to 5%， the borides reprecipitate in the joint center， resulting in the reduction of shear strength. In this case， the joint failure evolves to a composite mode with the co-existence of ductile and brittle fracture.

vacuum brazing  /  Ni-based brazing filler  /  brazing mechanism  /  microstructure  /  mechanical property
郭杰杰, 李华鑫, 蔡良益, 朱帅, 闾川阳, 贺艳明, 杨建国. 采用BNi82CrSiB-xCu钎料钎焊304不锈钢接头的微观组织与力学性能. 材料工程, 2026 , 54 (1) : 168 -177 . DOI: 10.11868/j.issn.1001-4381.2023.000830
Jiejie GUO, Huaxin LI, Liangyi CAI, Shuai ZHU, Chuanyang LYU, Yanming HE, Jianguo YANG. Microstructure and mechanical properties of 304 stainless steel joints brazed by using BNi82CrSiB-xCu filler metals[J]. Journal of Materials Engineering, 2026 , 54 (1) : 168 -177 . DOI: 10.11868/j.issn.1001-4381.2023.000830
Appendix
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Year 2026 volume 54 Issue 1
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Article Info
doi: 10.11868/j.issn.1001-4381.2023.000830
  • Receive Date：2023-12-11
  • Online Date：2026-10-26
  • Published：2026-01-20
Article Data
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History
  • Received：2023-12-11
  • Accepted：2024-03-15
Funding
Affiliations
    1.Institute of Process Equipment and Control Engineering，Zhejiang University of Technology，Hangzhou 310023，China
    2.Engineering Research Center of Process Equipment and Remanufacturing，Ministry of Education，Zhejiang University of Technology，Hangzhou 310023，China
    3.College of Mechanical Engineering，Zhejiang University of Technology，Hangzhou 310023，China
    4.Shanghai Aerospace Equipment Manufacturing Co. ，Ltd. ，Shanghai 200245，China
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表12种不同金属材料的力学参数
科
Family		 属数
Number of
genus		 种数
Number of
species		 占总种数比例
Percentage of
total species (%)		 属
Genus		 种数
Number of
species		 占总种数比例
Percentage of total
species (%)
鹅膏菌科Amanitaceae 2 11 5.26 鹅膏菌属 Amanita 10 4.78
小菇科 Mycenaceae 2 12 5.74 丝盖伞属 Inocybe 5 2.39
多孔菌科 Polyporaceae 8 14 6.70 蜡蘑属 Laccaria 5 2.39
红菇科 Russulaceae 3 23 11.00 小皮伞属 Marasmius 6 2.87
小菇属 Mycena 11 5.26
光柄菇属 Pluteus 5 2.39
红菇属 Russula 17 8.13
栓菌属 Trametes 5 2.39
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