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The mechanical properties and microstructure of a large 635mm x 1016mm (25in x 40in) HIPed low carbon (LC) Astroloy preform were measured as a function of heat treatment and cooling rate. The tensile properties, impact strength and microstructure were determined on samples integral to the preform and compared with small samples individually heat treated. The effort was supplemented by Differential Thermal Analysis (DTA), modeling of the large preform heat treat cycle and x-ray diffraction analysis. Results showed that room temperature properties of LC Astroloy were related to microstructure, which in turn was affected by the cooling rate from the solution treating temperature and by the stabilization and aging temperatures. DTA showed the γ’ solvus to be well above the standard solution treating temperature for this alloy. X-ray diffraction analysis confirmed the expected presence of γ’, M23C6 and M3B2 borides in a gamma matrix. Modeling of the heat treatment cycle showed a significant variation in the heating and cooling temperatures between edge and center of the large preform. This variation produced a difference in the heat treated microstructure and properties. This observed variation in cooling rate from the solution temperature must be addressed in LC Astroloy if minimum desired property levels are to be attained in large section sizes.

Effect of Thermal History on the Properties and Microstructure of a Large HIPed PM Superalloy Billet