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JWJ > Volume 30(6); 2012 > Article
Journal of KWJS 2012 December;30(6) :106-112.
Published online December 23, 2012.
doi:https://doi.org/10.5781/KWJS.2012.30.6.106
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*
*National Core Research Center, Pusan National University, Busan 609-735, Korea
**Dept. of Material Science and Engineering, Pusan National University, Busan 609-735, Korea
***Dept. of Material Science and Engineering, Pusan National University, Busan 609-735, Korea
Correspondence: Chung-Yun Kang  Email: kangcy@pusan.ac.kr
  Published online December 23, 2012
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.
Keywords: Heat exchanger | Ni201 | Inconel625 | MBF-30 | Brazing | Microstructure | Mechanical properties
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