Puzzling Question for Stress Relief Gurus

[jackboot]

I have a theoretical question.

Question: I have a hollow thin-walled cylinder. I put it in a press and plasticity deform it in the lateral direction. At this point, I have an oval shaped "cylinder." If I stress relieve this part - will the cylinder move towards its initial round shape?

Or what direction would it move, or does it move at all?

jackboot

 

[unclesyd]

If you have plastically deformed the metal there will be no appreciable change in shape if the stress relief temperature is below 1150°F

 

[metengr]

To add to unclesyd's comment, the key is if you have permanent deformation -which you indicated. The permanently deformed material will not appreciably move without any additional force applied at or above 1150 deg F. This additional force at temperature is required to permantly deform the material back in the opposite direction - similar to re-rounding a cylinder.

 

[TVP]

The 1150 F temperature applies to steel, and not to non-ferrous metals like aluminum and magnesium.

 

[jackboot]

Thank you all very much.
jackboot