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Changes in Mechanical Properties of the Wide-Gap Region Brazed with Various Brazing Temperatures and Times

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Abstract:

The microstructural changes and the relations between mechanical properties and additive powder with various brazing temperatures and times were investigated. The IN738 and BNi-3 alloy powders were used as an additive and filler metal powders for the brazing process. The wide-gap brazing process was carried out in a vacuum of 2×10-5 torr. The wide-gap region brazed with 60wt.% IN738 additive powder had a microstructure consisting of IN738 additive, and binary eutectic of Ni3B-Ni, and (Cr, W)B. As the brazing temperature and time were increased, the size of IN738 additive powder increased to 181µm, which decreased the amount of low strength Ni3B-Ni eutectic structure, thereby increasing the fracture strength of the wide-gap brazed region. Cracks in the brazed region were observed to propagate through the Ni3B-Ni structure, which lowered the fracture strength of the wide-gap brazed region.

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Periodical:

Materials Science Forum (Volumes 486-487)

Pages:

113-116

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.486-487.113

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Online since:

June 2005

Authors:

Yong Hwan Kim, S.I. Kwun

Keywords:

Additive Powder, BNi-3 Filler Metal, Fracture Strength, Ni3B-Ni Eutectic, Wide-Gap Brazing

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© 2005 Trans Tech Publications Ltd. All Rights Reserved

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