Aging. 7075 aluminum 2

[dho]

how to bring T651 parts to T7351 ? 250F for 10 hours ?
thanks.

 

[Ron]

Are these extrusions, forgings or rolled sections?

 

[TVP]

Technically, you would have to re-solution heat treat then quench, followed by two-step aging. T651 requires heating to 250 F for 24 hours, while T7351 requires 225 F for 6-8 hours followed by 350 F for 6-8 hours. You might try heating to 350 F for somewhere between 6 and 18 hours. Check SAE AMS 2772 and 2770 for more details.

 

[dho]

AMS2770D seems very clear. in table VI, 7075 lists temper b4 aging T6, 250F for 8-10 hr, temper after aging, T73.
AMS2770H confuses me a little. in table 7, 7057 starts at AQ (as quenched) and W (solution heat treated). but note 4, says step 1 may be omitted if parts in T6 temper.
the parts are already made from T651 bar. it should be T7351. solution heat treat will damage/distort the parts. just want to make sure, it can be done by 250F 10 hr from T651 to T7351.
thanks.

 

[swall]

For this situation, my former employer, an aerospace supplier, would re-age at 340-360F for 6-8 hours.