Effect of Tensile Deformation on Residual Stress of GH4169 Alloy

Abstract

In order to reduce the residual stress of the GH4169 alloy, the effect and micro-mechanism of the tensile deformation were studied. The residual stress, dislocation density, and distribution of the GH4169 alloy were analyzed by X-ray residual stress tester, X-ray diffractometer (XRD), and electron backscatter diffraction (EBSD). The results show that: with the increase of tensile deformation, the residual stress relief first increases and then decreases. When the tensile deformation is 3%, the reduction rate of residual stress reaches the maximum, which is 90%. The mechanism of residual stress relief by the tensile treatment is that the dislocation group in the alloy is activated by tensile treatment, and the dislocation distribution in the alloy is more uniform by dislocation movement, multiplication, and annihilation so that the residual stress can be eliminated.

Effects of Double-Stage Annealing Parameters on Tensile Mechanical Properties of Initial Aging Deformed GH4169 Superalloy

“…Figure 3 shows the influence of the FSA time on mechanical properties. From Figure 3 a, it can be found that there is no obvious elastic-plastic transition period, which is consistent with the normal behavior reported in References [ 42 , 43 , 44 ]. Thus, the offset yield strength corresponding to 0.2% plastic strain (called yield strength) is used.…”