625 Alloy

Alloy name: 625
Diagram No.: 816
Type of diagram: TTT
Chemical composition in weight %: 22 wt% Cr, 9 wt% Mo, <5 wt% Fe, 3.5 wt% Nb, balance is Ni
Alloy group: Nickel-based alloys
Note: It has been shown that different phases precipitate in Alloy 625 depending upon temperature and duration of ageing and TTT diagram is a helpful tool in analysing of the precipitation behaviour in this alloy. Several TTT diagrams have been presented for Alloy 625 which differ in certain aspects from each other. There are several possible reasons for these differences; the first is variation in composition within the ranges given for Alloy 625. The second source of variability is related to the techniques which are used to identify the phase transformations.
With these facts in mind, a TTT diagram for commercial Alloy 625 was first published by E. Schanbel and co-workers [88] and is presented in Figure. It is clear that heat treatment of the material during its processing can significantly change the TTT diagram; for example by solution annealing, the precipitation behaviour of Alloy 625 is changed. Crum and co-workers [88] have published a revised TTT diagram which is shown in Figures.
Reference: Not shown in this demo version.

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