BluntCut MetalWorks
Knifemaker / Craftsman / Service Provider
- Joined
- Apr 28, 2012
- Messages
- 3,420
Thanks. You've excellent understanding of edge tools and your questions are complex.
Strength represents quantitative resistances in degrees of movement freedom within elastic range (take time to parse this line
). Strength is a subset of toughness where toughness includes movement within plasticity and some ductility ranges. Hence very easily to get convoluted in deciphering/deducing one part from other. Unfortunately conventional/common physics refer toughness as some sort of pseudo resistance to brittle fracture, where a blade make from gum would be super tough but clearly it wouldn't be the toughness one has in mind when talking about edge tools.
You are right, the 63rc 3V has excess ductility and insufficient strength for given tasks in test. Edge geometry was intentionally thin to induce edge damage, which can be measure: mode and how much (kind and quantity). As stated in D2 video - 3V edge failed to whittle and did poorly on elk antler in compare to D2. Sure, D2 is 64rc but there are more than just 1 hrc diff involved here. Anyway both D2 and 3V rolled, except D2 rolled much less and its edge still functioning better than 3V. Next batch I will target 3V for 64rc. Not 65rc because from tested data, most steels have narrow plasticity range in 1-3rc at peak hardness. Your 3V chopper (I re-hted) at 15dps, 0.010" BET would micro-chip at these test tasks however extent(magnitude) of damage probably be less than this 63rc 3V.
From a non-knife user perspective, an edge tool performs a task: 1) pass/fail initially 2) pass/fail repeatedly 3) cost - extent of edge damage 4) cost - fixing damage. It seems knifenut often neglect 1 & 2 and mostly focus on 4. Well, it sure cost me more fixing the 63rc 3V than D2, but most importantly D2 passed the tasks involve antler.
But but one might say, we don't whittle nor chop antler with our knives. Well then either knife would works for less harsh/abuse usage, even with type of usage - D2 edge would performs better. Mind me - I am looking tasks and steel edge capability, not advocating a particular steel.
I agreed, per given task there is a good balance of strength aspect of toughness. Ideally a knife user really want is edge stability for given tasks.
BCMW - Batch 4 HT 5F is almost done. This batch only has 2 D2 blades. 1 has cryo other none, both same hrc at points prior to cryo, post cryo and tempered.
Strength represents quantitative resistances in degrees of movement freedom within elastic range (take time to parse this line
). Strength is a subset of toughness where toughness includes movement within plasticity and some ductility ranges. Hence very easily to get convoluted in deciphering/deducing one part from other. Unfortunately conventional/common physics refer toughness as some sort of pseudo resistance to brittle fracture, where a blade make from gum would be super tough but clearly it wouldn't be the toughness one has in mind when talking about edge tools.You are right, the 63rc 3V has excess ductility and insufficient strength for given tasks in test. Edge geometry was intentionally thin to induce edge damage, which can be measure: mode and how much (kind and quantity). As stated in D2 video - 3V edge failed to whittle and did poorly on elk antler in compare to D2. Sure, D2 is 64rc but there are more than just 1 hrc diff involved here. Anyway both D2 and 3V rolled, except D2 rolled much less and its edge still functioning better than 3V. Next batch I will target 3V for 64rc. Not 65rc because from tested data, most steels have narrow plasticity range in 1-3rc at peak hardness. Your 3V chopper (I re-hted) at 15dps, 0.010" BET would micro-chip at these test tasks however extent(magnitude) of damage probably be less than this 63rc 3V.
From a non-knife user perspective, an edge tool performs a task: 1) pass/fail initially 2) pass/fail repeatedly 3) cost - extent of edge damage 4) cost - fixing damage. It seems knifenut often neglect 1 & 2 and mostly focus on 4. Well, it sure cost me more fixing the 63rc 3V than D2, but most importantly D2 passed the tasks involve antler.
But but one might say, we don't whittle nor chop antler with our knives. Well then either knife would works for less harsh/abuse usage, even with type of usage - D2 edge would performs better. Mind me - I am looking tasks and steel edge capability, not advocating a particular steel.
I agreed, per given task there is a good balance of strength aspect of toughness. Ideally a knife user really want is edge stability for given tasks.
BCMW - Batch 4 HT 5F is almost done. This batch only has 2 D2 blades. 1 has cryo other none, both same hrc at points prior to cryo, post cryo and tempered.
Go on, I think many are interested in your results just won't admit it 
