Effect of Processing Route on Microstructure and Mechanical Properties of FGH4097 PM Superalloy Disk

In this paper, the effects of two manufacturing techniques on the microstructure and mechanical properties of Ni-based superalloy disks ware examined. The study focuses on FGH4097 superalloy, the bars were powdered using SS-PRER® technology and subsequently canned for processing via hot isostatic pressing (HIP) and HIP + isothermal forging methods. After each processing stage, the components underwent standard heat treatment (HT) as well as HT with solution at bellow γ′-solvus temperature.The tensile, creep, and stress rupture properties were evaluated to provide an understanding of the alloys′ structural behaviour following each processing step. The grain was refined resulting in room temperature tensile strength exceeded 1620 MPa. Interestingly, the creep strain of only 0.05% for 100h of creep at 700°C/500 MPa.