Effects of Heat Treatment on Microstructure and Mechanical Properties of GH4169 pulse Tig welding joint

Abstract:

four different heat treatment processes were used to heat treat the welded joints,which were prepared by the pulse Tig welding. We compared the unheated joint and the joints under four different heat treatments on microstructure and mechanical Properties. The results show that after four kinds of heat treatment processes, some phases dissolve, the joint tensile strength at room temperature and high temperature is improved, and the joint hardness is significantly increased, but the joint plasticity is significantly reduced after heat treatment. Among them, after 1020℃ solution treatment + two-stage aging, the Laves phase in the joint weld partially dissolved, and the tensile strength of the joint at room temperature and high temperature increased to the maximum.

Key words:Nickel-based superalloy GH4169; pulse TIG welding; heat treatment process; microstructure and properties