A Tale of 2 heat treat's (or why one ATS34 knife chips, and one doesnt)

Continued....

Webbing? How could nylon or cotton abrade steel?

The only thing we regularly cut that is abrasive is Cardboard. The high silt and mineral content makes it so. Same with dirty carpet, foot traffic imbeds grit, whit is rough on an edge. Skinning a shark or stingray would probably be abrasive too, or any animal like a wild boar that lays in the mud and wallows around and collects grit on their surface.

Well, when my 420v Apogee comes, I will compare it to a some other blades and see what happens.
 
Anthony have a look at the following thread :

http://www.bladeforums.com/ubb/Forum12/HTML/000512.html

RJ, as usual, makes a number of important points. Probably the most important is the fact that high RC steels will resist edge deformation while cutting soft stuff much better than low RC ones. I think this is becuase they have high deformation limits. The reason that they break up or chip out is that they also have low breaking points compared to the same low RC steels.

From what I know, I would have argued exactly as you have as it makes sense to me perfectly (deformation over abrasion resistance). However, while I am just guessing on the how and why, I am not on what actually happens. It seems to contradict what I think I should see. All this means is that I am ignorant of something that is fairly important. I would be interested in any testing results that you produce.

-Cliff
 
Anthony -- good questions, that I don't have answers to. My impression so far is for folder use, the harder, more brittle, more abrasion-resistant steel seems to keep working longer for me -- provided I don't start getting macro-size chips in the edge. These hard steels apparently can still roll though. I spent 45 minutes cutting up cardboard (some *very* thick cardboard at times, I had to often use most of my weight) to fit the regulations of my local city's recycling rules. I used my Axis, and after the first 15 minutes or so I found I needed to steel every now and then to keep performance up, so the edge was definitely rolling. I was using my typical edge, thin and coarse (spyderco brown stones as finishing grit). The Axis blade didn't chip at all except where I slipped off the cardboard and slammed it into the concrete floor. At the end, it could still very slightly shave hair in parts -- pretty damn good! This doesn't have much bearing on your argument, which is related to edge holding on softer materials, but I thought I'd report it anyway.

Joe
jat@cup.hp.com
 
This seems to bring up the old argument about which method is better. This debate has come up several times in the past.

Anthony,

I say it is time for a test. I have heared about tests being planned in the past. To the best of my knowledge they have never been done. So I say have two identical knives made and send one to each of the two treaters that are at the center of this debate. Then find out once and for all which "cook" is the better of the two through testing.

Regards,

Tom Carey
 
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