During the manufacturing of superalloy components, unwanted plastic deformation may occur during hot isostatic pressing and subsequent machining or grinding. High-temperature thermal cycles can increase recrystallization and reduce the alloy's mechanical properties. In this study, samples of IN738LC were subjected to plastic strains at different percentages and then exposed to thermal cycles at various temperatures. Structural investigations were conducted using optical microscopy, and the recrystallization phenomenon was studied. Tensile tests were performed at room temperature and 650°C, and stress-rupture tests were conducted under conditions of 982°C and 152 MPa on heat-treated samples. The results showed that no recrystallization of grains was observed until the annealing temperature of 1140°C; however, this phenomenon occurred at 1160°C and strains above 1 percent. At higher temperatures, recrystallized grains were observed with any level of plastic strain. The yield strength without recrystallization increased by 17%, while it decreased by 4% with recrystallization. The ultimate strength increased by 22% and 15%, respectively, and elongation increased by 9% and 66%. At 650°C, the yield strength decreased by 26% and 10%, the ultimate strength increased by 12% and 2%, and elongation decreased by 30% and 1%. The creep life and elongation without recrystallization decreased by 61% and 78%, respectively, while in the recrystallized sample, they decreased by 78% and 69%. The changes in mechanical properties can be attributed to the accumulation of dislocations and twin boundaries devoid of strengthening phase boundaries.