Effect of Solution Heat Treatment on Microstructure and Properties of GH3536 Superalloy

In this research, we systematically investigate the changes in microstructure and mechanical properties of GH3536 Superalloy in its hot-rolled state. Using scanning electron microscopy (SEM), energy-dispersive spectroscopy (EDS), metallurgical microscopy, and tensile testing, we examine the effects of different temperatures and durations of solid solution treatment. We find that a solid solution treatment at 1175 °C for 45 min leads to recrystallization and growth of grains in the alloy’s microstructure, with the average grain size reaching level 2.5 and primary carbides partially dissolving. These conditions are thus identified as the optimal parameters for solid solution treatment of the alloy. Excessive grain growth occurs when the solid solution temperature increases to 1225 °C or the holding time extends to 60 min. As the solid solution temperature and time increase, tensile strength, yield strength, and microhardness of the alloy decrease, whereas elongation increases.