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  1. #1
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    Cryogenic treatment of O1 question

    I am about to HT a blade in O1 and try a cryo treatment with dry ice and acetone. Hoss has advised me to go straight into the cryo bath from the oil quench, but I have read several sites that advise doing a temper before the cryo to minimize the possibility of stress cracking.
    I respect the judgment of Hoss on this but am concerned about the seemingly consistent advice to the contrary that I have been seeing. Does anyone else have any experience with this proceedure?
    And does Hoss have any clarification on his advice?
    Many thanks to any elucidation that anyone can impart on this!
    Spike C
    "The Buddha resides as comfortably in the circuits of a digital computer or the gears of a cycle transmission as he does at the top of a mountain."
    Pirsig

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    Ok, I found the thread where we discussed this recently. Hoss was clear about the why and how of the process, so I guess I will just grit my teeth and give it a whirl! I would't be so paranoid about this if I hadn't just spent some time carving on the blade blank!
    Spike C
    "The Buddha resides as comfortably in the circuits of a digital computer or the gears of a cycle transmission as he does at the top of a mountain."
    Pirsig

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    RRLOVER's Avatar
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    01 is very inexpensive,you should try both ways and see what you like better.

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    I did the HT at 1475, soaked for 5 minutes, then after quenching in fast quench oil put it into a bath of acetone and dry ice for a good 10 minutes, then into the oven at 340 for what will be 2 hours in 25 minutes more. I'm going to do another temper at the same temp for another 2hours after it cools to room temp. The blade is straight so far.
    Fun stuff! I hope there are no hidden stress fractures!
    Spike C
    "The Buddha resides as comfortably in the circuits of a digital computer or the gears of a cycle transmission as he does at the top of a mountain."
    Pirsig

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    that should make the blade about 63-64 I like 400f temper for 62-63 hardness

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    Marko Tsourkan's Avatar
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    Do what Hoss says. You won't regret it.

    M


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  7. #7
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    Quote Originally Posted by Marko Tsourkan View Post
    Do what Hoss says. You won't regret it.

    M
    That's what I'm doing! I'm on the second 2 hour temper as we speak (type)!!
    Spike C
    "The Buddha resides as comfortably in the circuits of a digital computer or the gears of a cycle transmission as he does at the top of a mountain."
    Pirsig

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    Marko Tsourkan's Avatar
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    Thumbs Up!


    "If there’s something worth doing, it’s worth overdoing.” - An US saying.

    If my KKF Inbox is full (or not), please contact me via Email: anvlts@gmail.com

  9. #9
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    I'm really happy with the last knife that I made, I've been using it every day and love the way it's working for me, so I'm looking forward to how this one turns out.
    Spike C
    "The Buddha resides as comfortably in the circuits of a digital computer or the gears of a cycle transmission as he does at the top of a mountain."
    Pirsig

  10. #10
    Senior Member rockbox's Avatar
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    For the steel that Hoss works with, he knows as much as anyone. Hoss reads research papers while most guys on boards like myself regurgitate what some other guy has said based on an anecdote. He also has the experience to test the theories. How many people have forged tens of thousands damascus billets?
    "Insanity: doing the same thing over and over again and expecting different results." --Albert Einstein

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