Effect of 650℃/500 MPa stress aging on microstructure and room temperature tensile properties of GH4169 alloy plate
GH4169 alloy plate treated with solution and aging were subjected to stress aging and stress free aging treatments for different time.Microstructure and room temperature tensile properties of the alloy after different stress aging treatments were analyzed using optical microscope(OM),scanning electron microscopy(SEM)and electronic universal testing machine.The results show that stress has no significant effect on the microstructure of the GH4169 alloy plate.After stress aging and stress free aging treatment,only a slight coarsening of γ″ phase occurs,and the size increases from 19.02 nm to about 23 nm,still exhibiting a circular granular morphology.The stress free aging treatment has little effect on the room temperature tensile properties of the GH4169 alloy plate.This is because the room temperature deformation mechanism of the GH4169 alloy plate is the shear γ″-phase movement of dislocations,the size of γ″ phase after stress free aging treatment is equivalent to that of γ″ phase after solution+aging treatment,and the stress required for dislocation shear γ″phase is equivalent,resulting in no change in room temperature tensile properties.As the stress aging time increases,the room temperature tensile strength of the alloy plate gradually decreases,and the room temperature tensile plasticity gradually increases.This is because during the stress aging process,the alloy plate has undergone residual plastic deformation,and dislocations have entered the γ″phase.In the subsequent room temperature tensile process,the stress required for dislocations again to shear the γ″ phase decreases,leading to a decrease in room temperature tensile strength and an increase in tensile plasticity of the alloy plate.
GH4169 alloy platestress agingmicrostructureroom temperature tensile property
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