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J Weld Join > Volume 30(6); 2012 > Article
Journal of KWJS 2012;30(6):106-112.
DOI: https://doi.org/10.5781/KWJS.2012.30.6.106    Published online December 23, 2012.
Effect of Brazing Condition on Tensile Properties in Brazing Joints of Inconel-625/Ni-201 Using MBF-30
Jeong-Woo Yu*, Sang-Hyun Park**, Chang-Su Kim***, Chung-Yun Kang*
Correspondence:  Chung-Yun Kang,
Email: kangcy@pusan.ac.kr
Abstract
This study was carried out to investigate the effect of bonding temperature and holding time on microstructure and mechanical properties in brazing joints of Ni-base superalloy using MBF-30 (Ni-4.5Si-3.2B [wt.%]). The heating rate was 20℃/min to the bonding temperatures 1050℃, 1070℃, 1090℃ under high vacuum condition. The holding times were 100s, 400s, 900s and 1600s. Ni3B phases and proeutectic Ni were observed in the interlayer of Ni-201. Then, Ni3B and Ni3Si were found in the middle region of brazing joint. Cr-boride phase appeared in the interlayer of Inconel-625. Tensile strength and elongation were decreased at 1050℃-1600s, 1070℃-900s and 1090℃-400s. After observation the fracture specimens, There was Ni3B which is very brittle phase in the grain boundary of Ni201.
Key Words: Heat exchanger, Ni201, Inconel625, MBF-30, Brazing, Microstructure, Mechanical properties


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