Wide-Gap Brazing of IN738 and the Bonding Strength Using Ni-Based Filler Metal Powders

Yong Hwan  Kim; Il Ho Kim; K.T. Kim; Seung Y. Shin

doi:10.4028/www.scientific.net/KEM.345-346.1449

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HomeKey Engineering MaterialsKey Engineering Materials Vols. 345-346Wide-Gap Brazing of IN738 and the Bonding Strength...

Wide-Gap Brazing of IN738 and the Bonding Strength Using Ni-Based Filler Metal Powders

Abstract:

The microstructure and bonding strength of the wide-gap region brazed with different filler metal powder (BNi-3 and DF 4B) and various powder mixing ratios of additive powder to filler metal powder were investigated. The microstructure characterization showed that Cr borides with a blocky morphology were existed in the brazed region in both filler metal powder. The bonding strength of the wide-gap region brazed with 60 wt.% IN738 additive and 40 wt.% DF 4B powder exhibited 92% tensile strength of IN738 superalloy at room temperature. The Cracks in the wide-gap brazed region initiated at the intermetallic compound and eutectic structure, and then propagated through them.

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Key Engineering Materials (Volumes 345-346)

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1449-1452

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https://doi.org/10.4028/www.scientific.net/KEM.345-346.1449

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Online since:

August 2007

Authors:

Yong Hwan Kim, Il Ho Kim, K.T. Kim, Seung Y. Shin

Keywords:

Additive, Bonding Strength, Eutectic, In738 Superalloy, Wide-Gap Brazing

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