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ASTM B918

ASTM B918

ASTM B918

(OP)
We are heat treating some forged aluminum parts from T6 to T73 and ASTM B918 is confusing. Can someone clarify the process for us:

The ASTM B918 calls for the following:
Annealing 860-900F for 1.5 to 2 hours (does it matter which 1.5 or 2 hours?)
Quench 140-160F
Aging for T73 225F for 6-8 hours then cool over time

That is it right?

There is mention of another 350F for 6-8 hours but that seems redundant.

Can some calcify exactly what HT process we need for the best strength and anti corrosion features.

Thank you.





RE: ASTM B918

AEKen,

For the solution heat treatment time, did you consult Table 3 of ASTM B918? The time depends on the thickness of the part. Regarding T73 precipitation treatment, this is a 2-stage process that must be performed in the correct order:

1st precipitation treatment is 215-235 F for 6 to 8 hours followed by
2nd precipitation treatment at 340-360 F for 8 to 10 hours

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