RS5 Alloy

Alloy name: RS5
Diagram No.: 1088
Type of diagram: CCT
Chemical composition in weight %: 0.08% C, 16.0% Cr, 10.0% Co, 4.8% Mo, 2.0% W, 4.8% Nb, 2.7% Ti, 1.5% Ta, 1.0% Al, balance is Ni
Alloy group: Nickel-based alloys
Note: Continuous cooling transformation diagram for superalloy RS5.
DSC analysis of hot isostatic pressed (HIPed), solution treated (116O C), and aged RSS specimens was used to develop the partial continuous cooling transformation diagram in a cooling rate range of 1 to 20 C/min shown in Figure. Two solid-state transformations were observed in this cooling rate range, one that begins to precipitate between 1050 C and 1010 C as the cooling rate increases and another phase transformation that occurs at approximately 980 C. The higher temperature precipitate is qphase; its transformation temperature range appears to coincide with the range of solubility for the Delta-phase in the RenC 220C alloy. The lower temperature phase also appears to be Eta-phase, but its nucleation may have occurred in the matrix rather than at grain boundaries or “ghosts” of the interdendritic segregation regions. Work is still in progress to elucidate this phenomenon. The Gamma’ and Gamma’ phase precipitation fields were observed using DSC to extend from just below 930 C to about 580 C at a cooling rate of 5 C/min; at 20 C/min this transformation starts at 765 C and finishes at about 620 C.
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