Call for Charpy toughness samples

We are down to just a few steels left. S90v, 440c, 440b, and D2. I want to do a few more 1095 samples at different hardnesses, and will likely order some Hitachi white and Hitachi blue.

I’ve got another piece of z-wear coming. I want to do samples from untempered to tempered over 500f to see the tempering response over a wide range.

Edit: I have a8mod to heat treat too.
 
Last edited:
OK I will contribute by doing some heat treatment and hardness tests on the S90V instead.
 
I bet the CPM D2 will perform much better than the ingot D2 did. In a knife, the edge held up much better from chipping.
 
5160 toughness was very good, close to 8670. The 5160 was heat treated with cryo unlike the 8670 which may be enough to explain the small difference. I will be writing an article about the effect of different austenitizing and tempering temperatures that were tested. It will probably come out April Fool's day, and a few days earlier for Patreon.
5160 toughness comparison chart.jpg
 
Larrin said:
5160 toughness was very good, close to 8670. The 5160 was heat treated with cryo unlike the 8670 which may be enough to explain the small difference. I will be writing an article about the effect of different austenitizing and tempering temperatures that were tested. It will probably come out April Fool's day, and a few days earlier for Patreon.
View attachment 1095556
Click to expand...
This one was your toughest sample, from your father 5160 coupons?
 
Willie71 said:
There’s 80crv2 to be tested too.
Click to expand...
From my limited testing, I wouldn’t think this steel would be as tough! But I could be wrong! I haven’t had great results with it. But I think I need to take some more time to test different heat treats. As far as Ztuff, I have very high hopes. But I’m curious, how much does nickel usually increase toughness? I always read that nickel is added for toughness. But why doesn’t shock steel have it? Or A8. I remember the old Infi had nickel in it, but not anymore.
 
rodriguez7 said:
From my limited testing, I wouldn’t think this steel would be as tough! But I could be wrong! I haven’t had great results with it. But I think I need to take some more time to test different heat treats. As far as Ztuff, I have very high hopes. But I’m curious, how much does nickel usually increase toughness? I always read that nickel is added for toughness. But why doesn’t shock steel have it? Or A8. I remember the old Infi had nickel in it, but not anymore.
Click to expand...

Nickel, silicon, and vanadium all help toughness. So does chromium. The main reason to use nickel and silicon is to increase toughness, where chromium and vanadium are also used as carbide formers, when used in certain volumes and carbon concentrations. High end coil springs tend to use silicon like 9260. Nickel seems to be favoured in steels used in saw blades.

80crv2 probably won’t be as tough as the other steels listed. It’s in the L2 spec, so toughness is an attribute. It’s also marketed as an upgrade from 5160. Im surprised the 8670 is tougher than the 5160. I thought 5160 would have topped the charts at this point.
 
Willie71 said:
80crv2 probably won’t be as tough as the other steels listed. It’s in the L2 spec, so toughness is an attribute. It’s also marketed as an upgrade from 5160. Im surprised the 8670 is tougher than the 5160. I thought 5160 would have topped the charts at this point.
Click to expand...
I think it was because the 5160 got cryo while the 8670 didn't. Though maybe the nickel in 8670 helped.
 
You must log in or register to reply here.
Back
Top