The Study of Brazing Two Metallic Substrates Using Ni-Based Fillers
Date Issued
2012
Date
2012
Author(s)
Hsu, Cheng-Ho
Abstract
First, the brazing of Inconel 600 using two boron-containing nickel-based fillers has been extensively studied. Based on SEM microstructural and WDS chemical analysis results, the mount and shape of precipitates in the central weld and bonding interface will change with brazing parameters. With increasing brazing temperature and brazing timed diffusion of boron into the base metal, result in decreasing amount of BCr and BCr2 intermetallic compounds in the weld and both continuous as well as granular B-Cr intermetallic compounds formal along grain boundaries. Even the maximum brazing temperature or brazing time are not able to effectively eliminate continuous precipitates along grain bundaries. The next study is brazing 316 stainless steel. According to the experimental results, BCr2 intermetallic conpound is formed in the weld and BCrFe ternary intermetallic phase is observed along grain boundaries at low brazing temperature or time. The brazing joint is primarily consist of Ni/Cr/Fe-rich and BCr2 intermetallic phase. The amount of BCr2 intermetallic compound is decreased in the centeral of weld with increasing brazing temperature and time. Boron content in the filler metal diffuses from weld to the base metal and forms BCrFe ternary intermetallic compound.
Subjects
Nickel-based filler
Ni-based alloy
Brazing temperature
Brazing time
Stainless Steel
Type
thesis
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