Study of mechanical properties and fracture mechanism of a new high-temperature alloys

摘要

GH3230 is a new type of superalloy,it is the first study about it.This paper studied the high temperature mechanical properties of the GH3230 base metal and argon-arc welding joints by high temperature tensile test,high temperature creep test and SEM analyses.The results showed thatthe ultimate tensile strength of GH3230 argon-arc welding joints is about 85.6％ of that of base metal under the same conditions.In the high temperature creep test,GH3230 argon-arc welding joints had a longer creep life than that of base metal.Both GH3230 base metal and argon-arc welding joints showed a ductile fracture.High temperature tensile fracture is cavities fracture and high temperature creep fracture is intergranular fracture.The deformation of GH3230 argon-arc welding joints is much more uniformited and smaller than that of base material,and GH3230 argon-arc welding joints has less cracks.