Thermo-physical simulation of the compression testing for constitutive modeling of GH4169 superalloy during linear friction welding

In order to simulate the flow behavior of GH4169 superalloy during linear friction welding (LFW), the novel isothermal compression tests of GH4169 superalloy were performed using a Gleeble-3500 device, up to a 60% height reduction of the specimens at deformation temperatures ranging from 970 °C to 1150 °C, and strain rates ranging from 0.01 s^-1 to 10 s^-1. In this investigation, a constitutive Arrhenius-type equation model was used to characterize the deformation behavior of the GH4169 superalloy during compression process. Under the different strains (0.1-0.7), the corresponding material constants and the activation energy for GH4169 were determined. The flow stresses calculated by constitutive equation were in a very good agreement with the experimental data. Further, the microstructures of the deformed specimens were observed and the microhardnesses of the deformed specimens were measured.