Effects of applied pressure on the brazing of superplastic INCONEL718 superalloy
Journal
Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science
Journal Volume
28
Journal Issue
6
Pages
1367-1376
Date Issued
1997
Author(s)
Abstract
A superplastic INCONEL 718 superalloy was brazed with a Ni-P and a Ni-Cr-P amorphous filler metal. The effects of applied pressure on the bonding strength, microhardness, and corrosion resistance were studied. The results showed that the brazements with Ni-Cr-P filler metal have higher bonding strength and better corrosion resistance than those with Ni-P filler metal using a conventional brazing method without applied pressure. When brazing was conducted under applied pressure, the bonding strength increased with applied pressure for the brazements with both filler metals. This was caused by a decrease of intermetallic phase through ejection of the liquid phase enriched with melting temperature depressants in the molten filler metals from the joint clearance. Corrosion tests show that these brazements failed at the brazed joint and at the grain boundaries in the region adjacent to the brazement.
Type
journal article