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This study was carried out to investigate the effect of bonding temperature and holding time on microstructureand 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. Ni 3 B 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 Ni 3 B which is very brittle phase in the grain boundary of Ni201. Key Words : Heat exchanger, Ni201, Inconel625, MBF-30, Brazing, Microstructure, Mechanical properties 1.   Plate/Fin            30      1,2)

Effect of Brazing Condition on Tensile Properties in Brazing Joints of Inconel-625/Ni-201 Using MBF-30