Overaging of 17-4PH

Question

Overaging of 17-4PH

HardMetal (Materials)

(OP)

14 May 03 12:09

Do the mechanical properties of 17-4PH in the H925 condition degrade significantly if it is aged an additional 4 hours at 925F? If so, do you have any data showing how much?

Thanks.

Paul

Metalguy (Materials) · Answer 1 · 2003-05-14 15:28:37

They don't degrade a whole lot-only slightly. Remember, with tempering or precip. hardening, the temp. has a big effect (log.) but the time is merely linear.

I don't have actual data, but if you lose more than a few points Rc I'd be surprised.

stanweld (Materials) · Answer 2 · 2003-05-14 15:30:59

17-4 PH with 925 F for 4 hr preciptation hardening treatment will provide a minimum tensile strength of 170ksi-ref Vol. 2 8th Edition of Metals Handbook.

stanweld (Materials) · Answer 3 · 2003-05-14 15:55:39

Whoops! Misunderstood. 8hrs total time at 925F. Shouldn't be much less than 170ksia- expect approximately 165ksi min.

HardMetal (Materials) · Answer 4 · 2003-05-16 09:54:07

Thanks for your help. I spoke with someone from AK Steel and he said essentially the same thing, that the properties would not be significantly affected.

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Overaging of 17-4PH