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

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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.

Info:

Periodical:

Materials Science Forum (Volumes 486-487)

Edited by:

Hyung Sun Kim, Sang-Yeop Park, Bo Young Hur and Soo Wohn Lee

Pages:

113-116

DOI:

10.4028/www.scientific.net/MSF.486-487.113

Citation:

Y. H. Kim and S.I. Kwun, "Changes in Mechanical Properties of the Wide-Gap Region Brazed with Various Brazing Temperatures and Times", Materials Science Forum, Vols. 486-487, pp. 113-116, 2005

Online since:

June 2005

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$35.00

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