Correlation between heat treat thickness, forge thickness, and mechanical prop

[kevlar49]

We would like to make a hand forged aluminum 7075-T73 part 10-15" thick, rough machine it to 4-5" , then heat treat it. We need to meet a minimum of 50ksi yield. Is there an industry data source that could tell me if I can achieve these properties given the amount of prior work, forged thickness, and heat treat thickness?

 

[metengr]

Why not forge it down to the 5" near net shape thickness? Performing all that machining is wasted time and resources. If you can't forge it down to this thickness, find someone who can or consider an extrusion.

 

[kevlar49]

Sorry, internal features 4-5" thick. Overall housing is 14" diameter 13" long.

 

[tbuelna]

Here's the relevant table from MMPDS-01. It looks like 50ksi yield is right near the limit for your material, HT and section thickness. You will also want to pay attention to grain orientation when ordering your forging and machining the part, since there are slightly different mechanical properties relative to the grain direction (L, LT or ST).

Hope that helps.
Terry

 

[kevlar49]

Metengr,

Forgot to mention we have less than 25 units which does not warrant closed die forging cost or lead time.

Thanks tbuelna,
Dose that only apply at the forged thickness or at the heat treat thickness?