Influence of Forging and Heat Treatment on the Microstructure and Mechanical Properties of a Heavily Alloyed Ingot-Metallurgy Nickel-Based Superalloy

The newly designed ingot-metallurgy nickel-based superalloy SDZhS-15 intended for disc applications at operating temperatures up to 800&ndash
850 &deg
C was subjected to homogenization annealing and canned forging at subsolvus temperatures, followed by solid solution treatment and ageing. Mostly a fine-grained recrystallized microstructure was obtained in the forgings. It was revealed that post-forging solid solution treatment at T &gt
(Ts-50), where Ts is the &gamma
&prime
solvus temperature, led to a significant &gamma
grain growth, which in turn led to a decrease in strength and ductility of the superalloy. The solution treatment at (Ts-60)&ndash
(Ts-50) allowed to save fine &gamma
grains (d&gamma
= 10&ndash
20 &mu
m) and to provide the formation of secondary &gamma
precipitates with a size of around 0.1 &mu
m. In the forged and heat-treated conditions, the superalloy demonstrated superior mechanical properties, particularly excellent creep resistance at 650&ndash
C in the stress range of 400&ndash
1200 MPa. Microstructure examination of the creep-tested samples showed that a decrease in the creep resistance at 850 &deg
C can be associated with enhanced diffusivity along &gamma
grain and &gamma
/&gamma
interphase boundaries leading to formation of cracks along the boundaries. In spite of the heavy alloying, the topologically close-packed phases were not detected in the superalloy, including in the creep tested samples.