Heat Treatment - Crystal Weaving Foundation

WIP - 9.3" & 9.7" Scimeters in 10V 69rc

A8tleNxm.jpg


Cut & Chop edge stability tests on the 9.3" scimeter.

CPM 10V, 0.072" thick, 9.3" blade

69.25rc via HT 2.51

Sharpened: Diamond plates progression to 3K. 15 dps, ~0.015" behind edge thick.

Thanks for watching & comments.


BTW - if interested: there is a pass around BCMW 10V 69+rc hunter
https://www.bladeforums.com/threads/blunt-cut-metal-works-pass-around-bundle-65-5-rc-niolox-69rc-10v-66rc-s90v-67-rc-zwear.1526175/
 
CPM 10V 69.25rc via HT 2.51

Testing 10dps edge for kitchen and delicate edc tasks.

Cuttings: cardboard, rope, wood, outdoor electrical wire

Some bone contacts (+ an incidental bone impact) and chops into end grain cutting board.

Result:
passed: cut cardboard & rope
Micro-chips: wire & bone contact
sharpening bevel tall chips: bone impact

Thanks for watching & comments.

 
Thank you, Luong, for continuing to share so much high-level information.

That 10V blade is extremely hard and thin, with an extremely thin edge width. I would think that K390 would be a better steel for this hardness and geometry. It has pretty much the same edge-wear resistance as 10V, but with considerably more toughness.
 
I haven't CWF HT 1.1+ K390 yet, so not sure how much or whether it better than 10v at 66+rc. I like K390 2%Co & 1%W extra composition over 10V but once hardness is above 66rc, all bet are off. 2%Co provide strong grain & carbide interfaces with Co's hcp crystal structure - I project ~5% better interface cohesion than 10v. However this number easily overwhelm by retained austenite% when aust at mid-to-hi austenite temperature.

This 10v test edge was very thin. Freehand sharpened on diamond plate at 7dps, stropped at 8dps - rounded apex looks like 9-10dps. I flattened the apex to remove chips from bone impact, then a straight V sharpened at 15dps and behind edge only 0.005-0.0055" thick, 1/8" up from apex only 0.013" thick. It can whittle buloke wood w/o any problem now.

I tested 10v; rex121; etc with very thin edge - mainly to detect my ht process affectiveness in transform matrix dislocation into hcp+ferrite configuration == lower matrix potential energy + maybe 0.5-1rc higher + gain wear resistance(hcp) and toughness. Versus common tempering process to ease dislocation/stress by reduce hardness and transform/precip stressed martensite into cementite and ferrite. For identical precipitated ferrite% (i.e. ductility), I prefer my process - gained strength and hcp is vastly superior to cementite.

Twindog said:
Thank you, Luong, for continuing to share so much high-level information.

That 10V blade is extremely hard and thin, with an extremely thin edge width. I would think that K390 would be a better steel for this hardness and geometry. It has pretty much the same edge-wear resistance as 10V, but with considerably more toughness.
Click to expand...
 
A 25 minutes video explains why BCMW knives are kept at high hardness/hrc. I talk quite extensively (far from precise nor complete) about crystal structure and packing ratio/efficiency.

Toward the end of video -I discussed a way for knife owner to lower hrc by 0.5-1.5rc only when needed/wanted.

*oops! forgot to discuss the atom counting math from fcc to hcp+Fe+C vs fcc to bct vs bct to Fe3C+Fe. Oh well, will do this maybe/if on next video about this topic.

Thanks for watching.

 
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Cut thin papers (such as phonebook & newsprint) is a convenient edge sharpness test however sharp areas compensate/hide dull areas. So, I was looking for a test to show integrity of the edge for different stages from fresh sharpened to need to re-sharpen. Idea of non-traverse pressure cut popped into my mind this afternoon...

* note: this method isn't a good fit for testing toothy edge.

Thanks for watching.

 
bluntcut said:
I haven't CWF HT 1.1+ K390 yet, so not sure how much or whether it better than 10v at 66+rc. I like K390 2%Co & 1%W extra composition over 10V but once hardness is above 66rc, all bet are off. 2%Co provide strong grain & carbide interfaces with Co's hcp crystal structure - I project ~5% better interface cohesion than 10v. However this number easily overwhelm by retained austenite% when aust at mid-to-hi austenite temperature.

This 10v test edge was very thin. Freehand sharpened on diamond plate at 7dps, stropped at 8dps - rounded apex looks like 9-10dps. I flattened the apex to remove chips from bone impact, then a straight V sharpened at 15dps and behind edge only 0.005-0.0055" thick, 1/8" up from apex only 0.013" thick. It can whittle buloke wood w/o any problem now.

I tested 10v; rex121; etc with very thin edge - mainly to detect my ht process affectiveness in transform matrix dislocation into hcp+ferrite configuration == lower matrix potential energy + maybe 0.5-1rc higher + gain wear resistance(hcp) and toughness. Versus common tempering process to ease dislocation/stress by reduce hardness and transform/precip stressed martensite into cementite and ferrite. For identical precipitated ferrite% (i.e. ductility), I prefer my process - gained strength and hcp is vastly superior to cementite.
Click to expand...

Hcp in steel? That's nuts!
 
Luong,

So the CWF basically packs the matrix into lower energy but more dense structure that yields the HRC and performance.

I’m ignorant still but since cobalt is in the picture, what’s your take of HAP40?

Lastly, nice Niolox hunter! I was thinking of no more new knife but it’s so tempting.... :p
 
Hi Chris,

Hap40/Maxamet/T15/Rex121/Rex76/etc has enough Co% to form grain and particle interfaces = stronger anchor/embed into matrix. These Co% rich steels have higher yield strength w/i elastic range, however plastic range, they behave similar(narrow plastic range; fracture beyond that) to other high alloy steels. With very limited experience and don't know diameter & volume of Hap40's carbide, I think - M2 & cru-wear(ingot) steels are better because of mostly sub micron carbides.

Knife-nutness is a problem - great to have such privilege :cool:

Chris "Anagarika" said:
Luong,

So the CWF basically packs the matrix into lower energy but more dense structure that yields the HRC and performance.

I’m ignorant still but since cobalt is in the picture, what’s your take of HAP40?

Lastly, nice Niolox hunter! I was thinking of no more new knife but it’s so tempting.... :p
Click to expand...

Here is problem in converting austenite to martensite: https://en.wikipedia.org/wiki/Burgers_vector

Calculate how much PE in dislocation(exclude RA): https://en.wikipedia.org/wiki/Stacking-fault_energy

If this # is too high and activities provide small additional energy to activate (go over the barrier toward lower PE) - given that we trust this ;) https://en.wikipedia.org/wiki/Minimum_total_potential_energy_principle

****** Everything ******
99% can be understand & optimize now. Last 1% is future 99% recursive.
 
I made two 3.5"blade x 1"W partial tang util blades in Vanax, 0.130" thick. https://www.alphaknifesupply.com/Pictures/Info/Steel/Vanax-DS.pdf

Tests Edge Stability @ 13dps, 0.014" edge shoulder, 2K diamond plate finished:
+Whittled - black bamboo; african blackwood; dried beef rib bone; 40D nail.
+Chopped - bamboo, african blackwood (this one is very harsh on edge), 10 gauge outdoor electrical wire.

Under 22x magnification = Edge has micro ripples, no roll nor chip = passed tests.

This round I used HT 2.5 got this working hardness at 61.5rc (missed target 62rc working hardness). Next round, I will use ht 2.51 (more costly) for the next 2 blades - probably/hopefully achieve 62rc working hrc.

Update 20171121:
Mucked around with this blade now it is only 61rc. Edge ripple-to-roll when whittle african blackwood = no longer get a passing grade from me. Rope cutting; yard works; kitchen; cardboard tasks - vanax performed quite well, very similar to 20cv/m390 at same hrc. Vanax 62+rc would/could come close to my ideal high corrosion resistance knife.

Must push for 62+rc, I will re-ht the 2nd blade using high aust temperature - along with m390,10v,s110v blades.

C Fe vs N Fe Crystal... Foggy crystal clear o_O
https://en.wikipedia.org/wiki/Van_der_Waals_force
rv (picometer)
C 185
N 154
 
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*** Notice - video/topic is quite abstract, thus guarantee boredom for most of you ***

Somewhere in this thread, I mentioned CWF is an applied narrow field from my much broader quest of Physics Fundamental. The video below is just a perspective/state on current Physics, hence it isn't my main endeavor. Nevertheless, it is applicable to Metallurgy (eventually).


Non-electromagnetic model should correctly consists of Right and Left Handed/twisted fields. RH field flows from North to South pole. LH field flows from South to North pole.

Correct vs current incomplete model of magnetic field
https://i.imgur.com/f97vtvJ.png

Wikipedia image of standard/existing magnetic field model: https://en.wikipedia.org/wiki/Magnetic_field#/media/File:VFPt_magnets_BHM.svg

Rene' Descarte Mag Field - https://commons.wikimedia.org/wiki/File:Descartes_magnetic_field.jpg

Vector Field: https://i.imgur.com/O0eabFb.png

2 magnets opposing fields - 70 degrees V configuration: https://i.imgur.com/PhPwDek.png

Hex config - North opposing poles: https://i.imgur.com/CCe467a.jpg

Zoom-in result of 2 South free poles from hex config: https://i.imgur.com/eb7ULUm.jpg

Sun Corona magnetic flux RH & LH twisted field with current flow triggered plasma discharge
https://i.imgur.com/O2LtDxu.png

NASA - Fiery Looping Rain on the Sun -

**==============**
Consider in context of this video *** With only RH field, magnet would lose its energy quickly and accelerate in certain direction due to asymmetrical field momentum ***

27–2Energy conservation and electromagnetism
27–6 Field momentum - http://www.feynmanlectures.caltech.edu/II_27.html

Current (incomplete) Physics Magnetic field lines (vectors) - flows from N to S in this image: http://www.feynmanlectures.caltech.edu/img/FLP_II/f27-06/f27-06_tc_big.svgz

To be publish: ***** Motion Theory *****
Energy structure (matter) persistent field state. Field structures correspond to motion of object - 2nd level fundamental force. Interactions (tensor field) between objects.

Configurations of motion(fundamental force) equivalent to Strong, Electroweak and Gravity Forces.
 
HT 2.5 for Nitrogen Steels (extra param) on a Vanax blade.
Result: Peak 63rc, 350F tempered to 62.5rc working hardness.

Tested 14dps, 0.007" BET, 3K diamond plate edge:
Passed whittle mod-to-hard woods. Rolled on African Blackwood and dried beef rib bone.
Passed chop olive & bamboo. Micro chips on AB.

When time permits, I will push for 63rc working hardness.
 
bluntcut said:
*** Notice - video/topic is quite abstract, thus guarantee boredom for most of you ***

Somewhere in this thread, I mentioned CWF is an applied narrow field from my much broader quest of Physics Fundamental. The video below is just a perspective/state on current Physics, hence it isn't my main endeavor. Nevertheless, it is applicable to Metallurgy (eventually).


Non-electromagnetic model should correctly consists of Right and Left Handed/twisted fields. RH field flows from North to South pole. LH field flows from South to North pole.

Correct vs current incomplete model of magnetic field
https://i.imgur.com/f97vtvJ.png

Wikipedia image of standard/existing magnetic field model: https://en.wikipedia.org/wiki/Magnetic_field#/media/File:VFPt_magnets_BHM.svg

Rene' Descarte Mag Field - https://commons.wikimedia.org/wiki/File:Descartes_magnetic_field.jpg

Vector Field: https://i.imgur.com/O0eabFb.png

2 magnets opposing fields - 70 degrees V configuration: https://i.imgur.com/PhPwDek.png

Hex config - North opposing poles: https://i.imgur.com/CCe467a.jpg

Zoom-in result of 2 South free poles from hex config: https://i.imgur.com/eb7ULUm.jpg

Sun Corona magnetic flux RH & LH twisted field with current flow triggered plasma discharge
https://i.imgur.com/O2LtDxu.png

NASA - Fiery Looping Rain on the Sun -

**==============**
Consider in context of this video *** With only RH field, magnet would lose its energy quickly and accelerate in certain direction due to asymmetrical field momentum ***

27–2Energy conservation and electromagnetism
27–6 Field momentum - http://www.feynmanlectures.caltech.edu/II_27.html

Current (incomplete) Physics Magnetic field lines (vectors) - flows from N to S in this image: http://www.feynmanlectures.caltech.edu/img/FLP_II/f27-06/f27-06_tc_big.svgz

To be publish: ***** Motion Theory *****
Energy structure (matter) persistent field state. Field structures correspond to motion of object - 2nd level fundamental force. Interactions (tensor field) between objects.

Configurations of motion(fundamental force) equivalent to Strong, Electroweak and Gravity Forces.
Click to expand...


Who knew that knife steels/metallurgy could be explained so simply!? But that’s the whole point of physics, innit?!
 
unwisefool said:
Soooooo, I looked at the videos, and from what I can tell, you are making a plasma knife that's like the sun. Except smaller. And with fancy handles
Click to expand...
Unfortunately a new piece of equipment (for physics) arrived early, so I won't make a S690/M4 65-67rc chopper tomorrow. I am forging some cool metals below the photosphere - nice Corona display eh ;)

Yonose said:
Who knew that knife steels/metallurgy could be explained so simply!? But that’s the whole point of physics, innit?!
Click to expand...
It sure seem so... at least to me it is :p
 
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