Heat Treatment - Crystal Weaving Foundation

Agree. Hardened steel edge tool + cold + impact could = breakage.

I mentioned a few times above about steel transition temperature - i.e. rapid loss of toughness. Here are 2 videos testing cwf ht at temperature a few degrees colder than Canadian winter :)

[video=youtube_share;5-mVEp7BiLo]http://youtu.be/5-mVEp7BiLo[/video]

[video=youtube_share;_L5eLHSwpjY]http://youtu.be/_L5eLHSwpjY[/video]

I appreciate your warm offer in real-life testing cwf ht large/chopper blade in cold temperature. All along, I am hopping somebody else actually replicate cwf ht, so that multitudes of tests be done in wide environments. If/when in need of testing in cold temperature and thing is still in relevant context, I will give you a ping.

Revolverrodger said:
Thanks bodig fir the excellent link
The reason I ask is that I have had knives perform well at room temperature but fail catastrophically in sub zero temperatures
This is especially true when the knives are brought from a warm place (inside hot tent) to outside (-20to-39oC)
I have even seen a wetterling axe shatter !
Click to expand...
 
bluntcut said:
Agree. Hardened steel edge tool + cold + impact could = breakage.

I mentioned a few times above about steel transition temperature - i.e. rapid loss of toughness. Here are 2 videos testing cwf ht at temperature a few degrees colder than Canadian winter :)

[video=youtube_share;5-mVEp7BiLo]http://youtu.be/5-mVEp7BiLo[/video]

[video=youtube_share;_L5eLHSwpjY]http://youtu.be/_L5eLHSwpjY[/video]

I appreciate your warm offer in real-life testing cwf ht large/chopper blade in cold temperature. All along, I am hopping somebody else actually replicate cwf ht, so that multitudes of tests be done in wide environments. If/when in need of testing in cold temperature and thing is still in relevant context, I will give you a ping.
Click to expand...

Very nice testing !
Two winters ago I was walking with my son on a frozen lake. We found a dead deer that had gone through the ice and froze in place. Only the head was out of the water.
The only thing I had on me was my Busse battle mistress so I used that to chop the antlers off. It was around -20oC and I have to admit I was somewhat surprised that the knife made it undamaged.
Bottom line a good heat treat is much more important that the steel used I think.
After seeing your video I think your knife would have survived as well.
 
bluntcut said:
Thanks bodog! Wow a year went by already. I sure am still appreciate your time in conducting that PA. bodog's PA knives, soon? (um no pressure :D)
Click to expand...

Wow, I guess it has been a year! The kitchen knife you sent me is still one of my favorites. Just sharpened it this morning.

j25uDbA.jpg
 
CPM 10V hunter - high wear resistance but not fragile.

Dimension: 0.105" thick, 1.125" wide, 4" blade, 8.25" OAL
HT: BCMW CWF
Handle: Stabilized Lace Ramon Burl, fastened 3x corby bolts
Sharpened: Edge Pro + DMT 17 dps, 0.012" behind edge thickness

Whittle: seasoned oak, Lignum Vitae Argentine, pork rib bone
Chop: seasoned oak.

Thanks for watching & comments.
[video=youtube_share;8pZmOrTbReQ]http://youtu.be/8pZmOrTbReQ[/video]
 
Oh the stories that cutting board could tell... great video to go with my morning coffee, boy you are rough on knives.
I was wincing when you started chopping but by now I should have known it was coming.
Great job, sure looks like you have got 10V figured out. Hoping you can find time to make a few to put on the exchange, well made high carbide knives are always welcome with us knife knuts.
Thanks for sharing.


Russ
 
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Thanks, Russ!

I had to tune cwf ht 10V params to produce very high strength and with adequate toughness buffer (per intended use). For 68rc, yield is half, so is it worth extra effort (higher price) for 1rc gain?

Yeah, that cutting board has carpal tunnel good look from faded cutting scars :p

==Luong

mycough said:
Oh the stories that cutting board could tell... great video to go with my morning coffee, boy you are rough on knives.
I was wincing when you started chopping but by now I should have known it was coming.
Great job, sure looks like you have got 10V figured out. Hoping you can find time to make a few to put on the exchange, well made high carbide knives are always welcome with us knife knuts.
Thanks for sharing.


Russ
Click to expand...
 
mycough said:
Oh the stories that cutting board could tell... great video to go with my morning coffee, boy you are rough on knives.
I was wincing when you started chopping but by now I should have known it was coming.
Great job, sure looks like you have got 10V figured out. Hoping you can find time to make a few to put on the exchange, well made high carbide knives are always welcome with us knife knuts.
Thanks for sharing.


Russ
Click to expand...

Yes - Please make more. The k390 you sent me is an amazing performer. It is quickly becoming one of my favorite knives. Top three for sure!
 
Luong,

Should have known but still shocked that a high carbide 10V at 68 HRC didn't chip whittling bone :eek:
Whether worth it? You can test by selling two versions see whichever sells better, with each priced accordingly of course ;)

Keep pushing the limit :thumbup:
 
foofie - thanks for your good words and appreciate your purchase. I am glad that k390 performs well. I only have 1 k390 blank but plenty of 10V, so will save the k390 blank for 2017. With CWF ht k390 & 10V have almost identical in performance, except k390 will generate 1rc higher but at cost of toughness - therefore I must be mindful to change ht params for k390 peak hrc lower by 1rc. 10V is much more readily avail, so when time permits - I work on 10V (and a few other steels) knives.

foofie said:
Yes - Please make more. The k390 you sent me is an amazing performer. It is quickly becoming one of my favorite knives. Top three for sure!
Click to expand...
 
Good idea, thanks, Chris!

My up coming batch will be a mix-bag 10v with various hrc. Only 1 is 68rc.

Chris "Anagarika";16592690 said:
Luong,

Should have known but still shocked that a high carbide 10V at 68 HRC didn't chip whittling bone :eek:
Whether worth it? You can test by selling two versions see whichever sells better, with each priced accordingly of course ;)

Keep pushing the limit :thumbup:
Click to expand...
 
Chris "Anagarika";16592690 said:
Luong,

Should have known but still shocked that a high carbide 10V at 68 HRC didn't chip whittling bone :eek:
Whether worth it? You can test by selling two versions see whichever sells better, with each priced accordingly of course ;)

Keep pushing the limit :thumbup:
Click to expand...

Chris, how will he know? They will all be gone within an hour or two... that one at 68hrc will be quite a find for some lucky knut...
Think about it... these may be the highest hardness knives ever offered on here. Pushing the limit? Luong is the limit.

Russ
 
Russ,

You may be right except that Luong keeps pushing his limit from his initial foray into knife making. When following his endeavor, it's very often that just when I thought he has done something better than most and should actually just go ahead and start selling, he found some new tweaks, outdid himself, many times, until now we see this CWF. Who knows what next?
 
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*smack* true - I am addicted to R and avoided Production. My next R push requires a minimum $5+K instrument, so that will wait a couple years:yawn:

Chris "Anagarika";16593314 said:
Russ,

You may be right except that Luong keeps pushing his limit from his initial foray into knife making. When following his endeavor, it's very often that just when I thought he has done something better than most and should actually just go ahead and start selling, he found some new tweaks, outdid himself, many times, until now we see this CWF. Who knows what next?
Click to expand...
 
If 'Dedicated' means no large edge/blade steering and no impact of high frequency type, I made of few of them already.

A very high strength (low ductility) blade will fracture (big chip or split apart) when subject to excessive lateral bending, e.g. when baton through knotty woods and blade forced to bend side-way beyond yield. Chop into very hard material (metal/carbide) with small contact area (huge psi), impact wave frequency is ultra short, so once a stress riser taken place (a small chip, crack), crack will propagate up until spine or arrested along its path. Easy to mitigate to avoid high freq by thicken geometry to ~ 18+dps, 0.025" BET. Steering issue is not just pertain to this type of blade but applicable to most blades depend on amplitude of force & degree of bend/flex, so keep adding strength via volume until worst case scenario doesn't result in failure.

A 68rc 10V 5-7" blade 18dps, 0.025" BET would be very functional even for light chop/tap (impact then push cut) usage. Edge stability is fine (IMO) - once weak protruding carbides are fall off. Edge still be sharp with army of saluting carbide - bite 'em deep.


Revolverrodger said:
I hope he makes a dedicated chopper one day
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"Army of saluting carbides..." Damn, Luong I can see that in my mind's eye. Quote of the week is hereby awarded.



Russ
 
bluntcut said:
*smack* true - I am addicted to R and avoided Production. My next R push requires a minimum $5+K instrument, so that will wait a couple years:yawn:
Click to expand...

Hi Luong,

Tinkering long enough until one is satisfied with the results is totally normal and perhaps the right thing to do when one is pursuing a goal that other doesn't see. If you've had listened to us asking you to launch earlier, you'd be busy making BCMW great knives but not CWF knives :o. Now you can focus on refining CWF method, earn some good $$$ to fund the next phase of R :thumbup:

Any chance offering re HT folder blades? I can send you some 8Cr blades ;) to do and relabeled them as BCMW CWF RHT (what a long acronym) :D.
 
CWF Re-ht is very straight forward when given just the blades. When time permits I'll ping you. Others can use as-published cwf ht as well.

Chris "Anagarika";16596187 said:
Hi Luong,

Tinkering long enough until one is satisfied with the results is totally normal and perhaps the right thing to do when one is pursuing a goal that other doesn't see. If you've had listened to us asking you to launch earlier, you'd be busy making BCMW great knives but not CWF knives :o. Now you can focus on refining CWF method, earn some good $$$ to fund the next phase of R :thumbup:

Any chance offering re HT folder blades? I can send you some 8Cr blades ;) to do and relabeled them as BCMW CWF RHT (what a long acronym) :D.
Click to expand...

A new video shows 64rc 3V accomplished similar tasks as 67rc 10V above, except with a thinner edge geometry.

CPM 3V, 0.09" thick, 1.125" wide, 3.5" blade, hollow ground
CWF HT 64rc
Sharpened 30* inclusive, 0.01" behind edge thick

Whittle: oak, Lignum Vitae Argentine, pork rib bone
Light chop: oak, Lignum Vitae

Thanks for watching & comments.

[video=youtube_share;Ei5aQV7JQVM]http://youtu.be/Ei5aQV7JQVM[/video]
 
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