625 Alloy

Alloy name: 625
Diagram No.: 822
Type of diagram: TTT
Chemical composition in weight %: 21.28% Cr, 8.7% Mo, 3.83% Fe, 3.58% Nb, 0.27% Mn, 0.26% Al, 0.30% Si, 0.28% Ti, 0.029% C, 0.007% Ta, balance is Ni
Alloy group: Nickel-based alloys
Note: TTT diagram of the Gamma'' and Delta phases in the studied alloy 625.
The TTT diagram for the Delta and the Gamma'' precipitation established from high resolution SEM observations of all the investigated thermal exposures is presented in Fig. The Delta phase is observed to precipitate in the 650 - 900 C temperature domain and preferentially between 700 C and 800 C, while the Gamma'' phase was found to precipitate in the 550 - 750 C temperature domain, with a precipitation nose between 650 C and 700 C. These precipitation domains are in quite good agreement with data extracted from the open literature.
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