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Posted by Stealth Pilot on May 9, 2008, 8:15 am
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On Wed, 7 May 2008 19:34:20 -0400, "Ed Huntress"
>
>> Having the fin as thin as possible is the most important, then weight and
>> strength. Looks like a heat-treated Ti alloy is in fact the best choice,
>> other than some "unobtainium", LOL!
>>
>> Thanks again for all your help, my goal is to travel our 330' course in
>> 1.8 sec!
>
>Well, good luck. Let us know how you do with it.
can you work harden titanium by hammering it to shape?
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Posted by Ed Huntress on May 9, 2008, 8:50 am
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> On Wed, 7 May 2008 19:34:20 -0400, "Ed Huntress"
>
>>
>>> Having the fin as thin as possible is the most important, then weight
>>> and
>>> strength. Looks like a heat-treated Ti alloy is in fact the best
>>> choice,
>>> other than some "unobtainium", LOL!
>>>
>>> Thanks again for all your help, my goal is to travel our 330' course in
>>> 1.8 sec!
>>
>>Well, good luck. Let us know how you do with it.
>
> can you work harden titanium by hammering it to shape?
Titanium alloys in general don't work-harden very much. Some, hardly at all.
The stronger titanium alloys are hardened by precipitation hardening, much
like aluminum and the precipitation-hardening stainless steels (17-7PH,
A-386, etc.).
--
Ed Huntress
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Posted by dcaster@krl.org on May 9, 2008, 10:33 pm
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> Titanium alloys in general don't work-harden very much. Some, hardly at all.
> The stronger titanium alloys are hardened by precipitation hardening, much
> like aluminum and the precipitation-hardening stainless steels (17-7PH,
> A-386, etc.).
>
> --
> Ed Huntress
I thought titanium alloys did work harden and that made them difficult
to machine.
In that you needed to get the tool under the work-hardened layer.
Dan
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Posted by Ed Huntress on May 9, 2008, 11:04 pm
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>
>
>> Titanium alloys in general don't work-harden very much. Some, hardly at
>> all.
>> The stronger titanium alloys are hardened by precipitation hardening,
>> much
>> like aluminum and the precipitation-hardening stainless steels (17-7PH,
>> A-386, etc.).
>>
>> --
>> Ed Huntress
>
> I thought titanium alloys did work harden and that made them difficult
> to machine.
> In that you needed to get the tool under the work-hardened layer.
>
> Dan
Not that I know of, Dan. Titanium has a reputation for not work-hardening
very much. It's worth checking out, in the machining context, but I'm pretty
sure that's the situation in general.
Titanium can be miserable to machine -- I remember doing some machining of
it back in the mid-'70s -- but my recollection is that it was more tough and
gummy than hard. But that's pretty far back in memory for me.
--
Ed Huntress
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Posted by dcaster@krl.org on May 10, 2008, 11:17 am
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> Not that I know of, Dan. Titanium has a reputation for not work-hardening
> very much. It's worth checking out, in the machining context, but I'm pretty
> sure that's the situation in general.
>
> Titanium can be miserable to machine -- I remember doing some machining of
> it back in the mid-'70s -- but my recollection is that it was more tough and
> gummy than hard. But that's pretty far back in memory for me.
>
> --
> Ed Huntress
Hmmm. I did a little looking on the internet and found sites that
said Titanium work hardens about like 1020 steel, that is not a lot.
But they followed this with warnings not to do anything that would
work harden it. Possibly more because it will gall and also because
it does not conduct heat well. So it sounds as if you can't harden
titanium much by work hardening, you need to machine it as if it does
work harden.
Dan
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