Young Franken CPM 10V 68rc

Status
Not open for further replies.
BluntCut MetalWorks

BluntCut MetalWorks

Knifemaker / Craftsman / Service Provider
Joined
Apr 28, 2012
Messages
3,462
What would happen to a thin edge of CPM 10V 68rc incidentally hits bone, rock, hammer and nail?

CPM 10V, 0.076" thick, 1" wide, 4" blade, 8.25" OAL, FG
CWF HT 68rc
Sharpened 15dps with ~0.005" behind edge thick
Fancy Halloween Handle

Thanks for watching & comments

[video=youtube_share;FHZUrtOPGH4]http://youtu.be/FHZUrtOPGH4[/video]
 
Whoa! Never seen a steel hold that acute of a geometry at that hardness!

Very cool!

Did you Austenize at a high temp?

Or just temper at a lower temp to get that hardness?
 
This 68rc was using an enhanced CWF ht process. A stable cwf ht 67 and lower are much easier than 68-68.25rc. I don't have a good point of reference to compare against industry ht because a terribly brittle 67rc is all I can managed to get using industry/common ht.

High Aust - yes. Super high aust - yes. More aust - yes.

Low temper temp - yes, in context of temperature but not HRC.

DeadboxHero said:
Whoa! Never seen a steel hold that acute of a geometry at that hardness!

Very cool!

Did you Austenize at a high temp?

Or just temper at a lower temp to get that hardness?
Click to expand...
 
Nice!
Hey Luong,
I've read your CWF thread,
I don't understand what the crystal weave foundation is.

Is there a way that you could explain it in a short concise way using simple terms?
 
Hey Shawn,

The latest lecture from Professor bhadeshia - I linked on CWF thread - is the formal/science explanation & causation pertain to the 'weave' part of my approach. I am still digesting the math in that lecture, which is a lot more details & deeper than my hand-waving. Those equations in that lecture would be the most concise explanation but not easy to comprehend. My video disclosing CWF tried to be a simple as it can be without filled with terminologies & references.
 
Shawn,

Watch the video Luong explaining the concept. Makes understanding easier. I don't pretend I totally grasp it though. :o
 
I only made one 10v halloween knife, so yes, I winced one or twice on the first 2 hits. But hey, need to break/damage to know the limits, then kick the limits a little further down road.
 
No point destruction test this slicer/boning knife. So, I fixed it up + a burl handle = double class fighter weighted in at 1.8 oz (48 grams).

q05N9i2.jpg


I need to make a heavier weight class to test impact toughness - 10V .156" thick x 1.7" wide, 10.5" blade, 16" OAL. Target hardness be around 66-68rc, 0.02" BET, 18dps. Test circuit: 2x4, 0.5 & .75" dia oak dowels. Oak dowel is murderous when chopping cross grain. If passed, it will face outdoor dried solid dead assorted woods. If passed, will hack up a partial rack of raw beef back rib. Um... probably won't get this far w/o macro chips (height >= 2mm) :nonchalance:

At the very least when facing a high possibility of wasting a good chunk of 10V... I want, this chopper to chop through a 2x4 with avg less than 12 hits and w/o any visible damage.

bodog said:
Any updates?
Click to expand...
 
Last edited:
Oh my aching arm - 30+ minutes per chopper: 2x4, 1" dia oak dowel, 3" dia pine branch. Thus far, it took on avg 14 chops per 2x4 (hold by one arm, chop with the other).

Over shot 10V hrc a tiny bit but didn't see any visible edge damages except a couple fractures from erroneous apexed with 120 SiC stone for this 10V.

daPzuat.jpg
 
Which one did you like the best? And how much would one of those bad boys cost just like they sit there? I have some ironwood and palo verde that needs some cutting :)
 
From what being chops - M4 is slightly heavier than 10V & 3V, so it chops through stuff best. Today, I gave the 10V another 20 minutes of hard chops oak board & dowel. Edge did fine.

I gave up, can't cross grain chop through 1" dia oak dowel! Wedging dead-stop the edge after about 0.6" deep.

These choppers need handle to generate faster chops. After additional tests, if they/any survive, I will think about what to do with them or make more...

Gnarly ironwood trunk&branches gotta be harsh on the edge. I think, it's probably harsher than chopping partial rack of beef rib.

bodog said:
Which one did you like the best? And how much would one of those bad boys cost just like they sit there? I have some ironwood and palo verde that needs some cutting :)
Click to expand...
 
A ht idea for huge gain in blade toughness and resolve ht thermal mass issue - popped in my mind. So, when steels arrive - I will make 11.25" blade choppers in 10V .19" thick x 1.8" wide and M4 .17" thick x 1.95" wide (actually 2.0" but I will narrow it down to fit the dewar). Target hardness: 10V 68rc, M4 67rc.

I will prototypes 3 field knives using this latest cwf ht: 6" blade 0.15" thick in 3V+10V+M4. HRC: 65+, 68+, 67+ respectively.

At this high hardness, edge/apex survival relies on strength. A high toughness blade can withstand higher impact load and in a way limit the fracture distance from destructive forces exerted area on apex/edge. Edge steering could bend/twist blade beyond yield point - new ht aims to provide more blade ductility and extend to plastic curve, so a bend could set (stay bend) and blade won't snap in half or suffer a giant half moon chip.
 
Today, I found a percussion point on the blade able to chopped through the oak dowel (ok, not a dowel but darn hard old oak)
2pan7yz.jpg


Bought some beef back ribs - actions!
[video=youtube_share;tphr_H1jmDI]http://youtu.be/tphr_H1jmDI[/video]
 
Status
Not open for further replies.
Back
Top