IN-718 Alloy

Alloy name: IN-718
Diagram No.: 750
Type of diagram: TTT
Chemical composition in weight %: 0.04% C, 53% Ni, 19% Cr, 3% Mo, 18% Fe, 0.5% Al, 0.9% Ti, 0.1% Cu, 5% Nb
Alloy group: Nickel-based alloys
Note: TTT diagram for IN-718. Figure shows a time-temperature-transformation (TTT) diagram for the precipitates in IN-718. Note that the TTT diagram does not address the relative volume of each precipitate. In IN-718 the volumes of gamma' and delta greatly exceed the volume of gamma' At low temperatures, the metastable precipitates gamma' and gamma'' predominate. At temperatures above 925 C (1700 F), the dominant phase is delta. At temperatures around 925 C (1700 F), the delta phase forms in a need lelike Widmanstatten structure. As the temperature is increased, the morphology of the delta phase becomes more blocky. When delta phase is subjected to strain at higher temperatures (980-1010 C, or 1800-1850 F), the delta phase is spheroidized. As the temperature is increased, the volume of stable precipitate is decreased, with complete solution occurring at the delta solvus temperature. Thus, hot working in the range from 980 to 1010 C (1800-1850 F) causes the formation of a small volume of spheroidized delta phase, which pins grain-boundary growth. The greater percentage of niobium is retained in solution and is available to form the strengthening gamma'' precipitate upon subsequent direct heat treatment (aging) of the forged part.
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