Quote:
Originally Posted by Ultramaroon
Send me the link to the survey. "Doesn't impact me at all because you fuckers have always been too cheap to send me one." |
Hope the link works.
https://mcmaster.az1.qualtrics.com/j...ImSo&jfefe=new
Quote:
Originally Posted by ichitaka05
Yeah, to certain degree, I do know small amount of metallurgy.
When I make a knife for customers or friends, I try to understand WHAT'S the purpose for this knife. Kitchen knife to cut stuff? Outdoor knife to chop branch/wood/etc? Combat knife to fight? EDC to carry around to cut paper or box? From there, thickness of the metal, grade of steel and angle of the bevel is decided. I'm still new at it, so I stay in high carbon steels like 1080~1095 (testing 5160 & 15N20 atm).
Steel like D2, O1, M4, Vanadis (?) or Z-series steels are unicorn steel to me. Stainless Steel like M398, CPM or even 440C is Mithril to me lol
With that said, if you want blade that you don't need to sharpen often and have same sharpness, would recommend SS. They're harder to get dull, BUT they're bitch to sharpen as well. If you truly want nice kitchen knife, go with high carbon steel. It require a lot of attention, but SS doesn't come near how sharp it can get.
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Yeah, most other alloys I am not familiar and only know a little about, it is all similar in reading the phase diagrams but some require more specific quenching and tempering procedures. Some like 440C I think need a non reactive atmosphere or you start pulling impurities out of the air. I mostly deal with high carbon alloys like 5160 and 1095 which are pretty simple, the quenching window is just a bit narrow. 1525F is ideal, 1600F and above will cause it to quench crack, below 1500F you start to fall out of phase.
It's funny you call it a dark art @
Ultramaroon. I was just talking to our GM about it a couple weeks ago about the "feel" to it and how we just can't through anyone back in the shop. It's not like we really use temp guns back there, if you know you know. Differentiating between the color when heated just comes with experience and wanting to know the happenings behind it.