X-750 Alloy

Alloy name: X-750
Diagram No.: 1099
Type of diagram: TTT
Chemical composition in weight %: 72.0% Ni, 7.6% Fe, 15.4% Cr, 0.9% Al, 2.5% Ti, 0.9% Nb, 0.1% Si, 0.004% C
Alloy group: Nickel-based alloys
Note: Time-Temperature-Transformation Diagram for Alloy X-750 (12).
The time-temperature-transformation (TTT) diagram for the alloy was developed by A. A. Hesse in the late 1970s and is presented in Figure (13). Included in this study was a determination of the precipitated phases found during the course of the development of the TTT diagram. These phases are listed in Table. A. A. Hesse reported the MC carbides existed both in the grain boundaries and in the matrix. The M23C6 was only present in the grain boundaries. Electrolytic extractions indicated the maximum amount of precipitated carbides to be 0.2 to 0.3 weight percent and the amount of Gamma’ to be about 14 weight percent. The Eta phase occurs as thin plates, generally intraganularly.
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