<p>This study quantified the semi-solid constitutive behavior of GH4710 superalloy using a Gleeble thermo-mechanical physical simulation system. The stress–strain curves, thermal analysis curves and microstructure indicate that the GH4710 superalloy undergoes a mechanical behavioral transition from ductile to brittle to ductile during solidification. In the brittle temperature range, solid-phase creep is the only mechanism that can accommodate solidification shrinkage and thermal stresses, and the dispersion or diffusion of γ/γ′ eutectic liquid films along grain boundaries enhances the alloy’s hot tearing tendency. At this stage, the intergranular strain is transmitted through the liquid film, which converts to intergranular bridging. This process reaches a critical state as the intergranular strain reaches a critical state when the liquid film ruptures, forming a hot tearing nucleus and leading to the further development of thermal cracking. Based on the analysis of microstructural evolution and hot tearing mechanism, we introduce a new independent variable, i.e., the fraction of grain boundary area covered with liquid. The fraction of grain boundary area covered with liquid was calculated by geometrical modeling, and the value rises sharply with the increase of liquid fraction, which reflects the effective contact area of GH4710 superalloy dendrites at the end of solidification. The main novelty of the proposed constitutive model is that it is capable of continuously simulating the stress–strain evolution of GH4710 superalloy ingot throughout the cooling process from the mushy zone to room temperature, and all the necessary input data can be obtained from conventional microstructure analysis and tensile tests.</p> Graphical Abstract <p></p>