Titanium question...

the rc is somewhere around 48 IIRC for the 6a4v ti, thats what is used for frame and liner locks.
 
Er, ah, Tom...I know that Chris Reeve heats up the locking part of the frame lock of Sebenzas with a torch. Have seen him doing this in a picture.

But you have lost me when you call this 'work hardening.' I thought work hardening was caused by hammering or bending or rolling.

Dazed and confused in CA, Walt
 
Walt :

I thought work hardening was caused by hammering or bending or rolling.
Click to expand...

Strain hardening is the process by which a ductile metal becomes harder and stronger as it is plastically deformed. This is also referred to as work hardening or cold working and it is achieved by forging, rolling, extrusion and drawing (which is basically what you described). The hardening is achieved by increasing the dislocation density in the metal. You can also do hot working which is the same process just carried out at an elevated temperature.

If Chris is just heating up the Ti, all that may be happening is that there is a surface reaction forming a very hard outer shell of some Ti compound.

-Cliff
 
Depends on who's frame lock is it. Same goes with liner locks. Some people do it some don't. I'm pretty sure no production company does it. By the production companies not doing it, it saves them time/money and also helps compensate a little for a poor lockup by having the lock gall. The downside is the titanium will wear much much quicker. By heat treat I'm assuming you are talking about the torching of the lock face surface of the titanium. A thin oxide layer forms that is very hard. The surface then becomes ~90Rc, kinda hard to believe but I asked this direct question a while ago in the CRK forum and this was the answer Anne gave me.

Tom, I think you need to torch it to red hot rather than dull red to get the full benefits.

-Johnny
 
well my propane torch wont get it that hot.. besides....I know from experience that it doesnt have to get super hot to get super hard...try grind some with a dull 50 grit belt sometime and you will see what i mean.. it doesnt even have to get red at all to get VERY HARD.

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http://www.mayoknives.com


 
Tom is right about grinding with a dull belt.
You just have to build up a little heat to get the spot harder. It has happened to some of my liners.

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Barry
Jones Knives

Do you hear that?
That is the sound of inevitability.
 
So there is no way to fully heat treat Ti all the way throught? I haven't worked with Ti but it seems that a thin piece of Ti would be relatively weak cause its not treated. What could cryo do for Ti?
 
there are about 30 different titanium alloys, only a few are heat treatable. mission knives is using one type....the rest are kinda like a lot of metals...they just are...if you get it hot in one area that area gets harder, but not by much....try go to mission knives website and check out their stuff....or do a seach on ti...

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http://www.mayoknives.com


 
mission has usually some of their beta ti for sale. price for a 6x12" x.25" thick piece runs for about $300. also you will have to send the ti back for hardening as this process is a company secret. also the hardness is then about 48 rc on the ti and it makes only sense to me if you gonna use it for blades. if i were you i would go for 6a4v ti and make the slabs or whatever you want thicker.

[This message has been edited by BladeMan (edited 03-26-2000).]
 
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