SUPERPLASTIC FORMING AND APPLICATION OF GH4169 SUPERALLOY

摘要

The superplastic forming and application of GH4169 superalloy are studied. It is shown that for the typical superplastic forming strain rates of 10~(-3) s~(-1) to 10~(-4) s~(-1), the available engineering strains of the fine-grain GH4169 superalloy are always higher than 250% within wide temperature scopes (920～980℃), and the maximum elongation to failure obtained is 513%. Dynamic grain growth is presented during superplastic deforming for the alloy, and the grain becomes larger with the increase of the strain. A GH4169 fuel manifold of an aerocraft is superplastically formed, and the superplastically formed GH4169 mainfold is tested by 30 MPa hydraulic pressure for 10 min. So some GH4169 alloy complex components can be superplastically formed in the aerospace industry to decrease the costs of fabricating these components.