[TheForge] Warning: On Topic post ;-)

[James Binnion]

Ti is tough but not particularly hard, it is difficult to sever a  
chip from it when compared to easier to machine metals. But one of  
the main reasons it eats drills and cutters for lunch is that its  
thermal transfer characteristics are horrible and the spot heating at  
the cutting edge anneals your tools edge rapidly and also welds Ti to  
the cutting edge neither of which are good for the cutting process.  
Flood coolant makes cutting Ti much easier. Also rigid high HP  
machine tools help a lot.
It does work harden rapidly but it is workable cold. Hot working is  
much easier  but compromises the mechanical characteristics of the  
surface material.


On Feb 13, 2006, at 9:12 AM, Bruce Freeman wrote:

> For what it's worth, MOST metals can be annealed by heating and  
> cooling.  (Steel is the exception.)
>
> I'm no expert, but I don't think annealing titanium would do much  
> good.  It would if you're trying to stress-relieve it, I suppose  
> this would work, but not if you intend to cold-work it.  I suspect  
> titanium work hardens quickly too, judging from reports about what  
> it does to drills and cutters...
>
> The stuff is HARD when cold.  Works like butter when hot, though.
>
> Note that there are titanium alloys, and you need to know which  
> you're working with.  Vanadium-containing alloys are not healthy to  
> forge hot.
>
> Bruce
> NJ
>
>>>> crimsonkil at lycos.com 2/13/2006 11:32:24 AM >>>
> Hi Folks,
>      How do I go about annealing titanium?
>
> Thanks,
>
> Chris K.
>
> It is I who formed the blacksmith,
> who fans the flame into a fire and
> fashions a weapon fit for it's work.
>
>
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James Binnion
jbin at well.com