Spyderco Forums

Deadboxhero wrote: ↑

Sat May 25, 2019 9:14 pm

I'm still testing this material. The new stability focused protocol at 64rc continues to please me. I'll share more when the time comes.



Larrin will release a new article this Monday that has great pictures of the microstructure of CPM 15v and some other steels that I sent him as well as others he purchased on his own (42 in Total, good work Larrin, Wow)

Surfingringo wrote: ↑

Sun May 26, 2019 4:59 pm

Thanks for the chart zrows, I was kind of thinking the same after looking at the composition. I was just curious how it might compare to some other “non-stainless” steels. Like more or less stainless than m4? I imagine Shawn will have an idea about corrosion performance by now. If not, I might have to get a piece and do a little of my own testing. :)

sal wrote: ↑

Sun May 26, 2019 9:13 am

Hey Shawn,

How's that design coming?

sal

Deadboxhero wrote: ↑

Wed May 29, 2019 10:08 pm

0.009"behind the edge/shoulder (BTE) of the secondary bevel at~15 degrees per side (DPS) freehand on a 800 grit Naniwa Resin Diamond stone,




Opened a can of food. With any steel at this thin of a cutting geometry that is asking for trouble let alone 23%carbide volume at 64rc. This is abuse, a good knife should not be used to do this but we can see the limits of things when we break them.

From my experience, 8cr13mov seems to blunt down with flat spots on the edge with a cutting geometry at 0.020" bte and 15dps and s110v at similar geometry and with the standard spec sheet HT seems prone to chipping when used like this.






I was surprised to see no chipping, just some deformity in one are with this steel, geometry and hardness.

This is a good indicator to increase the hardness beyond 64rc with a reduced tempering temperature.
65-66rc should be reasonable but it will be more difficult to grind since the matrix will hold on to those carbides better.

Doc Dan wrote: ↑

Thu May 30, 2019 5:08 am

Deadboxhero wrote: ↑

Wed May 29, 2019 10:08 pm

0.009"behind the edge/shoulder (BTE) of the secondary bevel at~15 degrees per side (DPS) freehand on a 800 grit Naniwa Resin Diamond stone,




Opened a can of food. With any steel at this thin of a cutting geometry that is asking for trouble let alone 23%carbide volume at 64rc. This is abuse, a good knife should not be used to do this but we can see the limits of things when we break them.

From my experience, 8cr13mov seems to blunt down with flat spots on the edge with a cutting geometry at 0.020" bte and 15dps and s110v at similar geometry and with the standard spec sheet HT seems prone to chipping when used like this.






I was surprised to see no chipping, just some deformity in one are with this steel, geometry and hardness.

This is a good indicator to increase the hardness beyond 64rc with a reduced tempering temperature.
65-66rc should be reasonable but it will be more difficult to grind since the matrix will hold on to those carbides better.

Hahaha! That’s how we opened our food while camping back in the day. It was interesting even then to note which steels from which makers would chip, role, or remain unfazed in those long gone days.