Titanium dive knife 60 to 65 hrc?

JoeBusic said:
I have just hardened Ti grade 5 to 60HRC. Grinding tomorrow to be sure it's not just the surface hardness. Making a dagger.
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Did you do any break tests to inspect the grain? Any tests to determine its strength or brittleness? At any rate I'm sure it will make a nice dagger.
 
Mecha said:
Did you do any break tests to inspect the grain? Any tests to determine its strength or brittleness? At any rate I'm sure it will make a nice dagger.
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No. When the blade will be ground, then. This is my first Ti blade and I want to get familiar with it ( the material). Hammering didn't do anything. After the grind it will be thinner and easier to brake. This thing shines a lot when grinding :)
About to heat treat and send to Larrin some D3 and D6 samples for testing. If he doesn't mind, I'll include Ti samples. Raw and hardened. No better way to find out the truth.
 
JoeBusic said:
No. When the blade will be ground, then. This is my first Ti blade and I want to get familiar with it ( the material). Hammering didn't do anything. After the grind it will be thinner and easier to brake. This thing shines a lot when grinding :)
About to heat treat and send to Larrin some D3 and D6 samples for testing. If he doesn't mind, I'll include Ti samples. Raw and hardened. No better way to find out the truth.
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Excellent, I look forward to hearing about your results!
 
Ground one side. Hardness 54-56 HRC. Can't break it. Barely bent with a lot of force. Tomorrow other side will be ground and we'll see (hopefully) the grains. :)
Fortunately, I have a small plate of Ti so scraping one part for science is no big deal.
 
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JoeBusic said:
Ground one side. Hardness 54-56 HRC. Can't break it. Barely bent with a lot of force. Tomorrow other side will be ground and we'll see (hopefully) the grains. :)
Fortunately, I have a small plate of Ti so scraping one part for science is no big deal.
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Nice! Ya, ti is generally shallow-hardening stuff, some more than others.
 
Mecha said:
Nice! Ya, ti is generally shallow-hardening stuff, some more than others.
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Done. Stock is 6mm. Ground to middle. 53-54 HRC. Bent before broken. Grains look very nice. So it seems a viable option for knives. Just to grind it before hardening so the edge is harder. Will make one and test cutability.

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JoeBusic said:
Done. Stock is 6mm. Ground to middle. 53-54 HRC. Bent before broken. Grains look very nice. So it seems a viable option for knives. Just to grind it before hardening so the edge is harder. Will make one and test cutability.

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Nice work! I grind all of mine close to final shape before HT to get the best effect, in my experience at least. Ti is responsive stuff and there’s lots of ways to manipulate its characteristics.
 
Hey Mecha Mecha ,

Have you tested any of the mission knives? I was thinking of getting an MBK for kayak fishing and boating.

I figure fleshy bait and fishing line shouldnt be a problem for it


Riz
 
Riz! said:
Hey Mecha Mecha ,

Have you tested any of the mission knives? I was thinking of getting an MBK for kayak fishing and boating.

I figure fleshy bait and fishing line shouldnt be a problem for it


Riz
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No, I’ve only checked them out at Blade Show. There are a few people on the forum who have had a lot of use with them.
 
To add some new info from testing. I have overheated to cca 1000°C and quenched. In the photo there is a clear distinction between the two. Overheated one has big grains and is darker in color. Although easier to break, still required teeth grinding force. Angle of break is cca 5° while the angle of break from the initial, obviously well treated specimen, was cca 40°. Hardness of the overheated one is not more than 55HRC 1/2 mm from surface.
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JoeBusic said:
To add some new info from testing. I have overheated to cca 1000°C and quenched. In the photo there is a clear distinction between the two. Overheated one has big grains and is darker in color. Although easier to break, still required teeth grinding force. Angle of break is cca 5° while the angle of break from the initial, obviously well treated specimen, was cca 40°. Hardness of the overheated one is not more than 55HRC 1/2 mm from surface.
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Matches what I've encountered. You can have two ti alloy specimens that are the same hardness, but way different in mechanical characteristics due to heat treatment. One will make a way better blade than the other despite them both testing at the same hardness. It's part of why I've always said these things needed to be tested in real-life use, and not just, "What's the rockwell on that?"
 
Yes. I'm no master, but did figure out steel logic. Ti logic is next. Today is search for understanding of ageing. Seems like there is a lot going on as cheepo's are avoiding it.
 
JoeBusic said:
Yes. I'm no master, but did figure out steel logic. Ti logic is next. Today is search for understanding of ageing. Seems like there is a lot going on as cheepo's are avoiding it.
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IMO the aging is where the magic happens. The quench is just preparation for that moment. :D
 
I don't know the technical differences between these Titanium knives but I have had pretty good reslts cutting a few materials at work with this knife. It seems pretty tough and since I sharpened it, it cuts pretty well. I am making this my main Diver now and it gets wet a few time a week.

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