Hot Deformation and Creep Rupture Behaviors of 617B Nickel-base Superalloy for 700℃(A-USC) Boilers

Abstract

The deformation behavior, microstructure evolution and precipitation phase of 617B alloy were studied by Gleeble thermal simulator, SEM and creep rupture test method. The results show that, 617B alloy has a high deformation resistance and the temperature range of processing secure channel is between 1165-1200℃; alloy instability exists in two forms:one is the formation of adiabatic shear band; another is the abnormal growth of full dynamic recrystallization grain; with extension of the stress rupture time, the microhardness increases rapidly and then tends to be steady, γ' is the main precipitate and the precipitate phase grows up with the time extension, but no harmful phases, and with higher stress rupture strength performance.

Keywords

• advanced ultra-supercritical(A-USC)
• 617B alloy
• precipitation
• deformation