Heat treating of 2024-0 to 2024-T42 ... Help !!

[Ian Mac Pherson]

Hi there everybody

I am currently building a Pazmany PL-2 and am looking for specific
information on the heat treating of 2024-0 Aluminium to the T42
condition. I have some information on the T4 condition but only scant
references to the T42 condition.

The sizes vary from 0.016 to 0.080 and the material is both Alclad and
bare. Any help locating a specific heat treatment "recipe" (ie.
temperatures, times, etc.) for each thickness and type would be greatly
appreciated. I expect that the diffusion of pure aluminium from the
cladding into the base material will affect the final temper and would
need to be compensated for.

Yours sincerely

Ian Mac Pherson
ian...@ozemail.com.au

PO Box 1226
Margaret St
Toowoomba Queensland Australia 4350

[Richard Isakson]

Bela P. Havasreti <bph...@bcstec.ca.boeing.com> wrote in article
<340ef91...@130.42.135.117>...
<snip>
> I don't have my references here with me, but....
>
> I believe T4 and T42 condition are essentially one and
> the same. The T4 nomenclature is assigned to new
> material/stock heat-treated at the factory where the
> sheet metal is manufactured (large coils, sheets, etc.)
> where T42 is assigned to "end-user" heat-treated
> material.
<snip>

MIL-HDBK-5 shows that 2024-T42 has an 8 percent lower yield stress than
2024-T4 in thin sheets.

Rich

[jj...@dow.com]

In article , "Richard says...

My metals handbood indicates that the T-42 means quenched, naturally aged, and
stress relieved by compression (whatever that means).

[Bela P. Havasreti]

On 5 Sep 1997 01:50:27 GMT, "Richard Isakson" <r...@whidbey.com> wrote:

>Bela P. Havasreti <bph...@bcstec.ca.boeing.com> wrote in article
><340ef91...@130.42.135.117>...
><snip>
>> I don't have my references here with me, but....
>>
>> I believe T4 and T42 condition are essentially one and
>> the same. The T4 nomenclature is assigned to new
>> material/stock heat-treated at the factory where the
>> sheet metal is manufactured (large coils, sheets, etc.)
>> where T42 is assigned to "end-user" heat-treated
>> material.
><snip>
>
>MIL-HDBK-5 shows that 2024-T42 has an 8 percent lower yield stress than
>2024-T4 in thin sheets.
>
>Rich

Yes, I should have mentioned that as I recall, there were slight
differences in properties. FWIW, my structural repair manual
allows replacement parts to be manufactured from 2024-O
heat treated to T42 condition. I'm guessing that the higher
yield strength of T4 is the result of cold working the newly
manufactured material/sheet....

Bela P. Havasreti CP-ASEL-I
SNJ-5 BuNo 91077 Basket case
NATA member #1742
EAA Warbirds of America (Cascade Warbirds Squadron #2)
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Puyallup, Washington USA
http://www.geocities.com/MotorCity/2951