Can 7075-T7351 Aluminum be forged? 3

[Shockdesigner331]

Can 7075-T7351 aluminum be forged? I haven't found any literature that specifically says that it can't. Does anybody have any experience with this? If it can not be forged is there a suitable temper in 7075 that can be? Thanks for your input.

 

[TVP]

7075 is readily forged in the -O temper. It is possible to deform 7075 to a limited extent at ambient temperature in the -H12 or -H13. 7075-T7351 is not forgeable, due to limited ductility. And if by forged you mean hot forged, then heating to the forging temperature (350-370 C) will destroy the mechanical properties, because the -T7351 temper is created by aging at 163-177 C.

 

[metengr]

You can review the information below

http://www.znoelli.co.nz/AluminiumPDFs/Znoelli7075specs.pdf

 

[swall]

I believe you are really asking if 7075 aluminum can be forged and then heat treated to the T7351 temper?

 

[BMKR]

7075 most definitely can be hot-forged, I've seen it first hand. Any temper/heat-treat you get on a supplied material is typically ruined and will have to be treated back to the condition the customer specified. (some customers require the same heat treat for barstock and post forging) Definitely going to be less expensive in the O cond. 2nded what TVP said.

 

[swall]

My Aluminum Association book shows the T7352 for forgings; the T7351 is shown for bar stock and plate.

 

[Shockdesigner331]

Thanks for the info. So if I was to get a block of 7075 in the -O temper and then forge it into shape. Could I then specify it to be tempered to T7351? I've heard of some tempers requiring compression stress relief, not really sure what is involved with that. I like the T7351 temper because of the increased resistance to stress corrosion cracking and material properties.

 

[metengr]

So if I was to get a block of 7075 in the -O temper and then forge it into shape. Could I then specify it to be tempered to T7351?

Yes.

The compression stress relief is a mechanical method of reducing residual stresses after quenching, prior to aging. However, the temperature for aging is too low to provide an effective stress relief. The need for such a mechanical stress relief is based on thickness and geometry of the aluminum product form.

Here is more information on the subject;

http://books.google.com/books?id=hu...ession stress relief of 7075 aluminum&f=false

 

[swall]

No, T7351 is for plate and bar. To get the equivalent grade with a forging, the designation is T7352. You will get the enhanced resistance to SCC that you are looking for with the T7352. The SCC resistance is determined first and foremost by the ageing temperature that pertains to the T7 designation, as opposed to the various T6 tempers.

 

[Shockdesigner331]

Thanks, my question has been answered!