Using JMatPro Simulation to Study the Effect of Heat Treatment Temperature on the Dissolution of Gamma-Prime Phase in Inconel ۶۱۷ Nickel-Based Superalloy

In this study the effect of heat treatment temperature on the formation and dissolution of gamma-prime phase has been studied in Inconel ۶۱۷. Since the working temperature of Inconel ۶۱۷ is above ۵۴۰°C, the samples were heat treated at different temperatures in a range between ۵۵۰ to ۸۵۰°C and simulations were performed at the same temperatures by the JMatPro software. It was found that the gamma-prime phase with different percentages (below ۱۰%) would exist in the temperature range of ۵۵۰ to ۸۰۰°C. However, it would gradually decrease as the temperature increases and finally dissolve completely at temperatures over ۸۰۰°C. The observations by metallography were in good agreement with the predictions made by the JMatPro software. The microstructure investigations using the optical and field emission electron microscopy showed that the gamma-prime phase exists at ۶۵۰°C and ۷۵۰°C, but its weight percent decreases with increasing temperature, so that at ۸۵۰°C no gamma-prime can be detected.

Keywords:

Inconel ۶۱۷ , Gamma-prime , JmatPro , Heat treatment , Microstructure