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6061T6 overaging

6061T6 overaging

6061T6 overaging

(OP)
what bad things will result if we purposely overage 6061T6 at high temperature except the reduced strength level?
thanks.

RE: 6061T6 overaging

How high of a temperature and for how long?

RE: 6061T6 overaging

(OP)
600F for an hour.

RE: 6061T6 overaging

The precipitates will coarsen, which reduces yield and tensile strength considerably.  Ductility/formability will be increased.  Fatigue strength will be reduced.

RE: 6061T6 overaging

(OP)
i care less about the strength or ductility and ... but is there a number about fatigue reduction?
thanks.

RE: 6061T6 overaging

The reduction will depend on microstructural variables like grain size, precipitate size, presence of non-metallic inclusions, etc.  Only a metallurgist from an aluminum producer would likely be able to assign a number to this, and that would depend on having all of the pertinent details.

RE: 6061T6 overaging

Aluminum is very poor in fatigue anyway. If fatigue is a concern, Aluminum might not be a good choice for your application. In my training, we were tought that Aluminum is unique in the metallurgy world in that there is no stress level that will not eventually result in fatigue failure. It is my understanding that this thinking has changed slightly, that there may very well be a fatigue limit for aluminum alloys but the stress level is so low it might as well not exist for all practical purposes.

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