Extra Hour on the precipitation cycle of Inco718 3

[BMKR]

We have not run a solution and precipitation cycle on 718 in some time and our program carried out an extra hour at the higher end of the precipitation cycle.

the AMS 6443 states that it gets 8 hours at 1325-1400, then cooled down to 1150-1200 (~1.5hrs) then held there for 8 hours. our cycle got an extra hour at the higher precipitation temperature. should total to approx 18hrs . we re-ran the load with the adjusted cycle even though the hardness was in our specified range just for safety measures.

Would the extra hour have greatly effected the size and quantity of precipitates in the 718?

 

[EdStainless]

I doubt that it would have much impact.
You re-ran the same parts? without an anneal?
That would do more to change them than an extra hour would.

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Plymouth Tube

 

[BMKR]

The whole cycle with solution anneal and percipitation, sorry for not clarifying this

 

[TVP]

I agree with EdStainless, the extra hour on the precipitation cycle would not have much effect. Often it is difficult to quantify these types of things because of the differences in the parts that are being heat treated, meaning the total mass, the maximum and minimum section thickness, etc.

 

[BMKR]

Understandable, thanks all.