Transient liquid phase bonding for Ni-base superalloys, Mar-M247 and IN939

Abstract

This study discusses TLP bonding of Ni-base superalloys Mar-M247 and IN939, using filler metals specially designed and fabricated into flexible foils by rapid solidification processes. Filler metals, selected by metallographic studies, produce almost the same microstructure in TLP bonds as in the base metal. The mechanical properties for TLP bonds have been investigated by stress rupture tests, which are the severest tests used to evaluate bonding strength. The results have also revealed that sufficient bonding pressure was indispensable for Mar-M247 to obtain high bonding efficiency. The TLP bonding efficiency for IN939 was obtained easier than Mar-M247. © 1992, The Japan Institute of Metals. All rights reserved.