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http://dx.doi.org/10.5781/KWJS.2012.30.6.592

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

Yu, Jeong-Woo (National Core Research Center, Pusan National University(NCRC))
Park, Sang-Hyun (Dept. of Material Science and Engineering, Pusan National University)
Kim, Chang-Su (Dong-hwa Entec R&D Center)
Kang, Chung-Yun (National Core Research Center, Pusan National University(NCRC))
Publication Information
Journal of Welding and Joining / v.30, no.6, 2012 , pp. 106-112 More about this Journal
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 $20^{\circ}C$/min to the bonding temperatures $1050^{\circ}C$, $1070^{\circ}C$, $1090^{\circ}C$ under high vacuum condition. The holding times were 100s, 400s, 900s and 1600s. $Ni_3B$ 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 $1050^{\circ}C$-1600s, $1070^{\circ}C$-900s and $1090^{\circ}C$-400s. After observation the fracture specimens, There was Ni3B which is very brittle phase in the grain boundary of Ni201.
Keywords
Heat exchanger; Ni201; Inconel625; MBF-30; Brazing; Microstructure; Mechanical properties;
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Times Cited By KSCI : 3  (Citation Analysis)
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